BA Newsletter: Get Analysis, Rankings Delivered To Your Inbox!

Seattle Mariners

Prospects Overview

Top 30 Prospects

Click prospect for player report

Player Reports

  1. 1. Julio Rodriguez | OF
    Julio Rodriguez
    Born: Dec 29, 2000
    Bats: R Throws: R
    Ht.: 6'3" Wt.: 205
    Drafted/Signed: Dominican Republic, 2016.
    Signed By: Eddy Toledo/Tim Kissner.
    Minors: .326/.390/.540 | 12 HR | 1 SB | 328 AB

    TRACK RECORD: Rodriguez was one of the premier hitters in the 2017 international class and signed with the Mariners for $1.75 million. He won MVP of the Dominican Summer League in his pro debut in 2018 and jumped to low Class A West Virginia to start 2019, where he teamed with fellow top prospect Jarred Kelenic in the outfield.The only speed bump Rodriguez encountered was a broken hand in mid-April that kept him out of action for two months. When on the field, Rodriguez was the talk of scouts, managers and opposing players. The Mariners promoted Rodriguez to high Class A Modesto in August, and he further embellished his lofty reputation by annihilating California League pitchers with a .462/.514/.738 slash line in 17 games. He finished his year in the Arizona Fall League and held his own as one of the youngest players there.

    SCOUTING REPORT: Often described as a manchild, Rodriguez packs an impressive set of tools into a large, muscular frame. He has unbelievable feel to hit, especially for his age, and shows a good approach with the ability to retain information and make adjustments at the plate. With plus bat speed and quick hands, Rodriguez shows a swing with a solid bat path through the zone. He controls the zone well and struck out just a shade over 20 percent of the time in 2019. Rodriguez's most exhilarating tool is his plus-plus raw power to all fields. He makes loud contact and projects to hit for both average and power when he's fully developed. Rodriguez is no more than an average runner now and will slow with age, especially since he's already getting thicker in his lower half. He split time between center and right field, but a plus-plus arm profiles him perfectly for right field. Rodriguez gets good reads and jumps in the outfield, projecting to be an average defender. Rodriguez has outstanding makeup and character and is frequently described as a joy to be around. He has learned English rapidly and takes pride in being able to do interviews in his second language.

    THE FUTURE: Rodriguez will continue to be pushed quickly through the Mariners' system, with some observers saying it wouldn't be a surprise to see him in the major leagues as a teenager. He has a chance to break camp with Double-A Arkansas to start 2020 and gives the Mariners a potential franchise, middle-of-the-order hitter to build around.

  2. 2. Jarred Kelenic | OF
    Jarred Kelenic
    Born: Jul 16, 1999
    Bats: L Throws: L
    Ht.: 6'1" Wt.: 196
    Drafted/Signed: HS--Waukesha, Wis., 2018 (1st round).
    Signed By: Chris Hervey (Mets).
    Minors: .291/.364/.540 | 23 HR | 20 SB | 443 AB

    TRACK RECORD: Kelenic was the consensus top high school hitter available in the 2018 draft and became the first prep taken when the Mets picked him sixth overall. Six months later, the Mariners acquired him in the deal that sent Robinson Cano and Edwin Diaz to New York. Kelenic shot through Seattle's system in 2019, jumping three levels to Double-A and posting a 20-20 season. He reported late to the Arizona Fall League due to dental work, then was shut down early with a sore back.

    SCOUTING REPORT: Kelenic is a precocious hitter who hits to his strengths and lays off his weaknesses. He has an advanced feel for his swing and makes quick adjustments. Kelenic uses a short, compact swing with powerful hip rotation that allows him to drive balls with above-average power, and he has good enough strike-zone awareness to hit for power without striking out much. A plus runner now, Kelenic may slow down as his body matures but should be a basestealing threat because of his advanced instincts. He has the foundation to be an average defender in center field with a plus arm, but his focus and effort on defense need to improve.

    THE FUTURE: Kelenic is a potential all-star in the mold of Jim Edmonds or Grady Sizemore. He'll see Triple-A in 2020.

  3. 3. Evan White | 1B
    Evan White
    Born: Apr 26, 1996
    Bats: R Throws: L
    Ht.: 6'3" Wt.: 205
    Signed By: Jackson Laumann.
    Minors: .293/.350/.488 | 18 HR | 2 SB | 365 AB

    TRACK RECORD: White's plus athleticism and premium defense date back to his college days at Kentucky, but the 2017 first-rounder long faced questions about whether he had enough power to profile at first base. White answered the doubters in 2019 with 18 home runs in 92 games at Double-A Arkansas while maintaining a high average. After the season, the Mariners signed him to a six-year, $24 million major league deal and added him to the 40-man roster.

    SCOUTING REPORT: White's defining tool will always be his defense. He's a plus-plus defender with a plus arm, with scouts praising his glove work as the best since J.T. Snow. His footwork, soft hands and instincts are all top notch and should result in multiple Gold Glove awards. A plus runner, White could also handle an outfield position and possibly even be a plus defender there with his natural athleticism. At the plate, White has very good feel for the barrel, excellent hand-eye coordination and keen strike-zone awareness. He lowered his hands to increase the loft in his swing and now shows 20-home run power to go with above-average or better hitting ability.

    THE FUTURE: White is on the fast track to Seattle after signing his big league deal. If he spends any time at all at Triple-A Tacoma in 2020, it won't be for very long.

  4. 4. Logan Gilbert | RHP
    Logan Gilbert
    Born: May 5, 1997
    Bats: R Throws: R
    Ht.: 6'6" Wt.: 225
    Drafted/Signed: Stetson, 2018 (1st round).
    Signed By: Rob Mummau.
    Minors: 10-5 | 2.13 ERA | 165 SO | 33 BB | 135 IP

    TRACK RECORD: Gilbert didn't pitch in 2018 after the Mariners made him their first-round pick but made up for lost time by jumping three levels to Double-A Arkansas in 2019. The former all-American showed his college success was no fluke with a combined 2.13 ERA and 165 strikeouts, tied for 10th in the minors. The Mariners named him their minor league pitcher of the year.

    SCOUTING REPORT: The velocity Gilbert lost near the end of his college career returned in 2019, with his plus fastball generally sitting 92-93 mph and touching 96. Gilbert's fastball is a separator with extra life, carry and ride due to the plus extension he generates with his long limbs. He is still inconsistent in commanding his breaking balls, but they both play up because of his pitchability. Gilbert's 72-77 mph curveball is an 11-to-5 pitch with consistent shape and high spin rates. His 78-84 mph slider comes in with a 10-to-4 shape with more horizontal movement. Both breaking balls are below-average but project average to above-average in time. He has feel for an average changeup in the low 80s, though he needs to throw it more frequently. Despite a long arm action, Gilbert is a good athlete who pounds the strike zone with above-average control.

    THE FUTURE: Gilbert projects as a solid mid-rotation starter and could make his debut in 2020.

  5. 5. George Kirby | RHP
    George Kirby
    Born: Feb 4, 1998
    Bats: R Throws: R
    Ht.: 6'4" Wt.: 201
    Drafted/Signed: Elon, 2019 (1st round).
    Signed By: Ty Holub.
    Minors: 0-0 | 2.35 ERA | 25 SO | 0 BB | 23 IP

    TRACK RECORD: Kirby walked just six batters in 88 innings in his final season at Elon and became the highest drafted player in school history when the Mariners selected him 20th overall. He signed for $3,242,900. Kirby reported to short-season Everett after signing and didn't walk a batter in 23 innings while striking out 25.

    SCOUTING REPORT: Kirby is more than just a strike-thrower and possesses an impressive arsenal of pitches. His fastball sat 93-95 mph and touched 98 in his pro debut, though those velocities were higher than usual because he was limited to shorter outings. He generally sits in the low 90s and touches 95. His best secondary pitch is a potentially above-average to plus slider at 83-88 mph with depth and a crisp break. His 79-83 mph curveball with 11-to-5 break projects to be an average pitch, while his 85-87 changeup flashes above-average, though he didn't use it much after signing. Where Kirby stands out most is his plus-plus control. He has a clean arm action and plus command, allowing him to put the ball wherever he wants in the strike zone.

    THE FUTURE: Kirby has a chance to jump straight to high Class A Modesto and rejoin his college pitching coach, Sean McGrath, whom the Mariners hired in the offseason. He's a likely No. 3 or 4 starter.

  6. 6. Noelvi Marte | SS
    Noelvi Marte
    Born: Oct 16, 2001
    Bats: R Throws: R
    Ht.: 6'1" Wt.: 187
    Drafted/Signed: Dominican Republic, 2018.
    Signed By: Eddy Toledo/Tim Kissner.

    TRACK RECORD: Marte signed with the Mariners for $1.55 million during the 2018 international signing period and made his pro debut in 2019 with an outstanding season in the Dominican Summer League. He batted .309/.371/.511, led the league with 54 RBIs and 134 total bases, finished second with 31 extra-base hits and, significantly, stayed strong late with a 1.041 OPS in August.

    SCOUTING REPORT: Marte is a five-tool athlete with plenty of upside. He has an advanced approach at the plate and uses a compact stroke with whippy bat speed and makes good swing decisions. An intriguing power-speed threat, Marte stole 19 bases in addition to hitting seven home runs in his pro debut. A plus-plus runner when he signed, Marte is now more of a plus runner and closer to 200 pounds after filling out. After having some throwing issues early in the season, Marte's shortstop defense improved thanks to a throwing program that boosted both his arm strength and accuracy. Concerns he would eventually move to the outfield have been lessened, but whether he remains at shortstop or slides to third base will be determined as his body continues to grow.

    THE FUTURE: Marte is following in the footsteps of Julio Rodriguez as another potential impact Dominican signee. He will make his U.S. debut in 2020.

  7. 7. Justus Sheffield | LHP
    Justus Sheffield
    Born: May 13, 1996
    Bats: L Throws: L
    Ht.: 6'0" Wt.: 200
    Signed By: Chuck Bartlett (Indians).
    Minors: 7-9 | 4.13 ERA | 133 SO | 59 BB | 133 IP

    TRACK RECORD: Originally drafted by the Indians and traded to the Yankees in the 2016 Andrew Miller deal, Sheffield had an up-and-down first season in the Mariners' system after coming over in the James Paxton trade. He began the year at Triple-A and got bombed for a 6.87 ERA, then dropped down to Double-A and rediscovered his form. He then jumped to the majors, finishing the year with eight appearances, including seven starts, in Seattle.

    SCOUTING REPORT: When he's on, Sheffield delivers a plus power fastball from the left side that sits at 93 mph and touches 97. The key to his improvement during his time in Double-A was commanding his fastball better after working with pitching coach Pete Woodworth, who will be the Mariners' big league pitching coach in 2020. Sheffield can vary the shape of his above-average mid-80s slider and gained confidence throwing his 84-88 mph average changeup with fade late in the year. Sheffield's effortful delivery has long resulted in below-average command, but he improved as the season progressed and stayed better on line to the plate.

    THE FUTURE: Sheffield's command shortcomings have most rival evaluators projecting him to the bullpen, but he will enter 2020 with a chance to make the Mariners' rotation.

  8. 8. Justin Dunn | RHP
    Justin Dunn
    Born: Sep 22, 1995
    Bats: R Throws: R
    Ht.: 6'2" Wt.: 185
    Signed By: Michael Pesce (Mets).
    Minors: 9-5 | 3.55 ERA | 158 SO | 39 BB | 132 IP

    TRACK RECORD: Dunn mostly pitched in relief at Boston College but turned himself into a first-round pick with a successful move to the rotation as a junior. The Mets drafted him 19th overall in 2016, and the Mariners acquired him in the Dec. 2018 trade that sent Robinson Cano and Edwin Diaz to New York. Dunn's first year in the Mariners' system went splendidly at Double-A Arkansas. He led the Texas League in strikeouts, made the Futures Game and earned his first major league callup in September.

    SCOUTING REPORT: Dunn's fastball sits 90-94 mph and averages 92, but it gets on hitters quick from his easy, effortless delivery. His separator is a plus low-80s slider he can land in the strike zone or bury for chases. It drew swings and misses nearly 40 percent of the time he threw it in the majors and gives him an out pitch. Dunn has the makings of an average changeup, though it is presently too firm in the upper 80s, and he also has a get-me-over curveball he'll occasionally throw. Dunn noticeably gained bad weight in 2019 and struggled to throw strikes in the majors, so he spent the fall improving his conditioning.

    THE FUTURE: Dunn will get another shot in Seattle in 2020. Most see his future as a two-pitch late reliever.

  9. 9. Brandon Williamson | LHP
    Brandon Williamson
    Born: Apr 2, 1998
    Bats: L Throws: L
    Ht.: 6'6" Wt.: 210
    Drafted/Signed: Texas Christian, 2019 (2nd round).
    Signed By: Jordan Bley (Mariners).
    Minors: 0-0 | 2.35 ERA | 25 SO | 5 BB | 16 IP

    TRACK RECORD: Williamson transferred from Northern Iowa Area JC to Texas Christian before the 2019 season and missed the fall after having surgery on both hips. He recovered to settle in as the Horned Frogs' No. 2 starter behind fellow lefthander Nick Lodolo and showed enough for the Mariners to draft him in the second round and sign him for $925,000. Williamson reported to short-season Everett after signing and showed an uptick in stuff.

    SCOUTING REPORT: After living in the low 90s in college, Williamson's heater came out sitting 91-96 mph with electric life at Everett. The result was an overall swinging-strike rate of 20 percent, one of the best in the minors, and plus grades on a pitch that was seen as average in college. Williamson generates high spin and good shape on his mid-70s curveball, another above-average pitch batters typically swing through, and he also has a low-80s slider that flashes average. He has feel for an above-average changeup but didn't use it much at Everett. Williamson uses a three-quarters delivery that is high on the front side and provides deception, and he maintains average control.

    THE FUTURE: The Mariners may have a second-round steal in Williamson. He will make his full-season debut in 2020 and projects as a possible No. 3 or 4 starter.

  10. 10. Kyle Lewis | OF
    Kyle Lewis
    Born: Jul 13, 1995
    Bats: R Throws: R
    Ht.: 6'4" Wt.: 210
    Signed By: John Wiedenbauer.
    Minors: .263/.342/.398 | 11 HR | 3 SB | 457 AB

    TRACK RECORD: It's been an arduous climb through the system for Lewis since the Mariners drafted him 11th overall in 2016, when he was the BA College Player of the Year. He tore the anterior cruciate ligament in his right knee in a grisly home plate collision in his pro debut and struggled with setbacks throughout 2017 and 2018. But he finally made it to the majors in 2019 after a solid, healthy season at Double-A Arkansas and made a splash by homering in each of his first three major league games.

    SCOUTING REPORT: Lewis is a power-over-hit type with high strikeout totals part of the package. There are a lot of moving parts to his swing, with a hand trigger and a leg kick, but he sees the ball well and generates the bat speed through the zone to produce high exit velocities. Now a tick below-average runner, Lewis' time in center field is likely coming to an end. The Mariners plan to station him in left field in 2020, where he'll be an above-average defender with solid instincts and an above-average arm.

    THE FUTURE: Lewis may skip over Triple-A Tacoma and win the wide-open left field job in Seattle. It will likely be his job to lose in spring training.

  11. 11. Jake Fraley | OF
    Jake Fraley
    Born: May 25, 1995
    Bats: L Throws: L
    Ht.: 6'0" Wt.: 195
    Drafted/Signed: Louisiana State, 2016 (2nd round supplemental).
    Signed By: Rickey Drexler (Rays).
    Minors: .298/.365/.545 | 19 HR | 22 SB | 382 AB

    TRACK RECORD: The key for Fraley in his first season with the Mariners' organization was to get healthy and stay healthy after injury-plagued seasons in 2017 and 2018. The Louisiana State product accomplished that mission by getting into 99 minor league games before making his big league debut for Seattle on August 21. He was shut down early with a sore thumb, but overall it was a valuable growth season for the former Rays' farmhand.

    SCOUTING REPORT: Being able to play every day helped Fraley turn himself into an impact hitter with solid tools. He has a solid approach at the plate with strong hands that help him drive balls to all fields, but needs to improve against lefthanders. While the swing is not particularly fluid, Fraley has the hand-eye coordination to compensate. It's more gap power, but he still hit a career-high 19 home runs in his 99 games split between two levels. A plus runner, Fraley's speed plays up even further because of his aggressiveness. Defensively, he can handle all three outfield positions with the chance to be a plus defender with an above-average arm.

    THE FUTURE: Fraley projects to be a starting major league outfielder who plays above his tools because of his intensity on the field and very good instincts. He should see a significant amount of time in Seattle in 2020.

  12. 12. Cal Raleigh | C
    Cal Raleigh
    Born: Nov 26, 1996
    Bats: B Throws: R
    Ht.: 6'3" Wt.: 215
    Drafted/Signed: Florida State, 2018 (3rd round).
    Signed By: Rob Mummau.
    Minors: .251/.323/.497 | 29 HR | 4 SB | 455 AB

    TRACK RECORD: After a three-year career at Florida State and 38 games at short-season Everett in his pro debut in 2018, Raleigh jumped a level to high Class A Modesto and then to Double-A Arkansas for his first full season. The big switch-hitting catcher finished third in the Cal League in home runs (22).

    SCOUTING REPORT: A rare switch-hitting catcher with big power, Raleigh gets to his raw power thanks to good direction in his bat, which makes up for below-average bat speed and a lack of lower-half mobility in the box. Scouts have seen Raleigh having to cheat to hit good velocity and he'll need to improve the quality of his at-bats as he advances. Behind the plate, Raleigh communicates well with his pitchers and frames and receives well. Because of his size he has to go to one knee to catch, but he transfers the ball well and his throws are accurate, with grades on his arm varying from below-average to just above.

    THE FUTURE: Raleigh will provide value if he continues developing his approach and improving as a defender. He'll return to Double-A in 2020 with a probable move to Triple-A later in the summer.

  13. 13. Isaiah Campbell | RHP
    Isaiah Campbell
    Born: Aug 15, 1997
    Bats: R Throws: R
    Ht.: 6'4" Wt.: 225
    Drafted/Signed: Arkansas, 2019 (2nd round supplemental).
    Signed By: Ben Collman.

    TRACK RECORD: Drafted in the second compensation round after a strong season as the Arkansas' Friday night starter, Campbell sat out his first pro summer after a long college season. He posted an outstanding 12-1 record and 2.26 ERA in his final year at Arkansas.

    SCOUTING REPORT: Campbell validated his decision to return to campus by improving the power, shape and command of his slider. His above-average fastball sat 92-95 mph in college, with the 84-87 mph slider being the pitch that allows the heater to play up. Rounding out his four-pitch mix is a split-changeup that flashes above-average with deception and tumble, as well as a 75-80 mph curveball. He locates his pitches well, keeping them at the bottom of the zone but also elevating the fastball as needed.

    THE FUTURE: Campbell's pure physicality convinces observers that he can remain in the rotation, projecting to be a No. 3 or No. 4 starter. He'll likely launch his pro career at low Class A West Virginia.

  14. 14. Juan Then | RHP
    Juan Then
    Born: Feb 7, 2000
    Bats: R Throws: R
    Ht.: 6'0" Wt.: 178
    Drafted/Signed: Dominican Republic, 2016.
    Signed By: Eddy Toledo.
    Minors: 1-5 | 2.98 ERA | 48 SO | 13 BB | 49 IP

    TRACK RECORD: The Mariners would have been wise to purchase a round-trip ticket for Then when they traded the lanky Dominican to the Yankees in late 2017, as he headed back to the organization last year in the trade involving big leaguer Edwin Encarnacion.

    SCOUTING REPORT: Then shows confidence on the mound, attacking hitters with his electric stuff. His fastball sits 92-93 mph, touching 96, and there's room on his frame to add strength. His heater comes out effortlessly and with late action. Still a work-in-progress that projects as an average pitch, Then's 80-84 mph slider has late break and 10-to-4 movement. The 83-88 mph changeup is a hard pitch that flashes plus, but he doesn't use it much. He throws his fastball for strikes but needs to get more swings and misses over the plate from his secondary pitches. He repeats a high-three-quarters delivery.

    THE FUTURE: We'll have a better idea about Then's future projection after more time in full-season ball, but for now mark him down as an intriguing starting pitching prospect.

  15. 15. Austin Shenton | 3B
    Austin Shenton
    Born: Jan 22, 1998
    Bats: L Throws: R
    Ht.: 6'0" Wt.: 195
    Drafted/Signed: Florida International, 2019 (5th round).
    Signed By: Dan Rovetto.
    Minors: .298/.376/.510 | 7 HR | 0 SB | 198 AB

    TRACK RECORD: After taking five pitchers to begin the 2019 draft, the Mariners went for a proven pure hitter in Shenton, who spent the last two years of his college career at Florida International after a freshman season at Bellevue (Wash.) CC. He split his first pro season between short-season Everett, ranking as the Northwest League's 16th best prospect, and low Class A West Virginia.

    SCOUTING REPORT: Shenton has real feel for hitting, consistently barreling balls and controlling the strike zone with advanced pitch recognition. He uses the whole field, showing average power mostly to the gaps but also with some pull-side home run pop. There are plenty of questions about where Shenton winds up defensively, as he's not particulary athletic but is a hard worker with a chance to stay at third base. He's a below-average defender with an average arm, but he could provide defensive versatility by also spending time at both left field and first base. Shenton is a below-average runner, but it's all about the bat for him.

    THE FUTURE: With a quarter of a season in low Class A already under his belt, Shenton could head to high Class A Modesto to start the 2020 season.

  16. 16. Milkar Perez | 3B
    Milkar Perez
    Born: Oct 16, 2001
    Bats: B Throws: R
    Ht.: 5'11" Wt.: 175
    Drafted/Signed: Nicaragua, 2018.
    Signed By: Tom Shafer.

    TRACK RECORD: Perez's $175,000 bonus was tops for a player from Nicaragua in the 2018 international class, and based on his pro debut he could turn into a bargain for Seattle. Shortly after signing with the Mariners, Perez played for his native country at the COPABE 18U Pan American Championships in Panama, where he made the all-tournament team. Launching his professional career one year later in the Dominican Summer League, Perez was one of the top performers for the Mariners' squad, hitting .274/.381/.388 and walking in just over 13 percent of his plate appearances.

    SCOUTING REPORT: Perez has an advanced approach from both sides of the plate, with a more compact swing from the left side, projecting as a potential hit/power combo. His best tool is a plus-plus arm, already graded as the best infield arm in the organization. He has below-average range but above-average hands, with the likelihood of being at least an above-average defender at the hot corner. He's a below-average runner.

    THE FUTURE: Perez will make his stateside debut after extended spring training, most likely in the Rookielevel Arizona League.

  17. 17. Dom Thompson-Williams | OF
    Dom Thompson-Williams
    Born: Apr 21, 1995
    Bats: L Throws: L
    Ht.: 6'0" Wt.: 190
    Signed By: Billy Godwin (Yankees).
    Minors: .234/.298/.391 | 12 HR | 15 SB | 432 AB

    TRACK RECORD: A 2016 fifth-round pick from South Carolina, Thompson-Williams joined the Mariners after three years in the Yankees' organization as part of the James Paxton trade and spent the entire 2019 season with Double-A Arkansas. At first glance, the numbers from his initial season with his new organization aren't impressive, but he hit much better (.277/.332/.509) away from the pitcher-friendly ballpark in Arkansas.

    SCOUTING REPORT: It's not the tools, athleticism or makeup that would hold Thompson-Williams back. He's got quick-twitch athleticism and is an average runner out of the box but is plus on the bases, as shown by the 35 bases he's stolen in his two years of full-season ball. Thompson-Williams has plenty of raw power and knows the strike zone, but his swing gets uphill at times and he struggles against better velocity. An average defender, he gets good jumps and reads in the outfield, and his tick below-average arm will be enough for any outfield position in a backup role.

    THE FUTURE: With a strong work ethic and willingness to hold himself accountable, Thompson-Williams could still bloom into a starting outfielder with more consistency in his swing.

  18. 18. Sam Delaplane | RHP
    Sam Delaplane
    Born: Mar 27, 1995
    Bats: R Throws: R
    Ht.: 5'11" Wt.: 175
    Signed By: Ross Vecchio.
    Minors: 6-3 | 2.23 ERA | 120 SO | 23 BB | 69 IP

    TRACK RECORD: Despite pitching well at every level since being drafted in the 23rd round in 2017, Delaplane wasn't a highly regarded prospect because he's a righthanded pitcher who stands under 6 feet tall. After striking out nearly 50 percent of batters he faced at high Class A Modesto, followed by a strong turn in the Arizona Fall League, Delaplane is getting more recognition.

    SCOUTING REPORT: Coming into pro ball, Delaplane had so-so stuff and thrived more with deception. He now attacks hitters with a plus fastball that sits in the mid 90s and touches 98 mph. The pitch shows good riding from Delaplane's deceptive, high-three-quarters delivery. His other pitch is a mid-80s hard slider that generates high spin rates and is thrown with a curveball grip. The breaking ball has strong tilt and gets swings and misses from lefties and righties. Delaplane has an undersized frame but with a sturdy build is often compared physically to major league reliever Greg Holland.

    THE FUTURE: Delaplane has averaged an astonishing 15 strikeouts per 9 innings in his career. He'll have to keep proving himself at higher levels, but his dominance in the Fall League shows that he's capable of thriving against better hitters. He profiles as a high-leverage reliever. He will likely head to Triple-A Tacoma in 2020 but with his eyes on Seattle.

  19. 19. Braden Bishop | OF
    Braden Bishop
    Born: Aug 22, 1993
    Bats: R Throws: R
    Ht.: 6'1" Wt.: 190
    Signed By: Jeff Sakamoto.
    Minors: .271/.358/.471 | 8 HR | 2 SB | 210 AB

    TRACK RECORD: Bishop couldn't avoid the injury bug for the second year in a row, this time missing a significant amount of time due to surgery to repair a lacerated spleen in a season in which the Washington product made his major league debut.

    SCOUTING REPORT: Bishop fits the profile of a fourth outfielder, but he's going to have to show more with the bat than he did during his big league trial in 2019. He hit with more power during his abbreviated season in Triple-A, but whether that translates to MLB performance is still in question. The strength he's added over the past two years hasn't resulted in significantly more impact at the plate, and a hitch in his swing requires him to get his bat started early. Bishop can do it all on the field, where he's a plus-plus defender with an above-average arm and has plus makeup and aptitude. Despite having plus speed, he's never been a big threat to steal bases.

    THE FUTURE: Bishop should break camp as an extra outfielder in Seattle, but that's likely his ceiling. Injury issues have kept him from putting more oomph into his swing, so staying healthy all year will give a more accurate picture of Bishop's offensive ceiling.

  20. 20. Jose Corniell | RHP
    Jose Corniell
    Born: Jun 22, 2003
    Bats: R Throws: R
    Ht.: 6'3" Wt.: 185
    Drafted/Signed: Dominican Republic, 2019.
    Signed By: Francisco Rosario.

    TRACK RECORD: Corniel, a product of the Marmolejos Baseball Academy in his native Dominican Republic, was one of the better pitchers in the 2019 class and signed with the Mariners for a $630,000 bonus on July 2.

    SCOUTING REPORT: Corniel has a very physical, projectable build with long levers and uses an effortless, balanced delivery with control rather than one that's explosive and effortful. A strike-thrower, he shows the ability to move the ball around the zone. His fastball ticked up to the low 90s during early workouts at the Mariners' academy in the Dominican Republic. Corniel can spin his above-average curveball and should have a solid changeup in time, giving him a three-pitch mix with above-average feel to pitch.

    THE FUTURE: Corniel won't turn 17 until June, so he likely won't get to the states for another year or two. He'll start his pro career in the Dominican Summer League in 2020.

  21. 21. Sam Carlson | RHP
    Sam Carlson
    Born: Dec 3, 1998
    Bats: R Throws: R
    Ht.: 6'3" Wt.: 200
    Drafted/Signed: HS--Burnsville, Minn., 2017 (2nd round).
    Signed By: Ben Collman.

    TRACK RECORD: It would be easy to have forgotten about Carlson by now, considering that the Mariners' 2017 second-round pick has pitched in just two games since being drafted. Arm troubles kept him out of action for a full year before he had Tommy John surgery last July.

    SCOUTING REPORT: Carlson is worth keeping on the radar because of his high school résumé, which shows that the Minnesota high school product was one of the better pitchers in the 2017 draft class. Prior to the injuries that wiped out much of the early part of his career, Carlson sported a heavy fastball up to 96 mph with late action and sink. He complemented that with an above-average slider with late action and tilt and a changeup that flashed plus.

    THE FUTURE: Carlson was expected to start long tossing in the fall with bullpen sessions to follow prior to spring training.

  22. 22. Aaron Fletcher | LHP
    Aaron Fletcher
    Born: Feb 25, 1996
    Bats: L Throws: L
    Ht.: 6'0" Wt.: 220
    Signed By: Tyler Witt (Nationals).
    Minors: 5-4 | 2.09 ERA | 84 SO | 18 BB | 74 IP

    TRACK RECORD: Fletcher pitched four years at the University of Houston, mostly in a bullpen role. He signed with the Nationals after being drafted in the 14th round in 2018 and jumped three levels in the first part of the 2019 season before being included in a trade to Seattle as one of three prospects acquired for Roenis Elias and Hunter Strickland. He finished 2019 with an assignment to the Arizona Fall League.

    SCOUTING REPORT: Fletcher is a reliever all the way, with the potential to be a good one because of the velocity from the left side. He gets sink and run on his 91-96 mph fastball, delivered from a funky, deceptive delivery with a high front side. His fringy slider plays up because its sweep makes it tough for lefthanded batters and he gets it to the back foot of righthanded hitters. He rounds out his repertoire with an average changeup.

    THE FUTURE: While he doesn't have a high ceiling, Fletcher will likely get big league time as an extra bullpen arm. He's likely to start 2020 back at Double-A Arkansas with a promotion to Tacoma to follow.

  23. 23. Joey Gerber | RHP
    Joey Gerber
    Born: May 3, 1997
    Bats: R Throws: R
    Ht.: 6'4" Wt.: 215
    Drafted/Signed: Illinois, 2018 (8th round).
    Signed By: Ben Collman.
    Minors: 1-4 | 2.59 ERA | 69 SO | 19 BB | 49 IP

    TRACK RECORD: Drafted in the eighth round in 2018, Gerber is a hard-throwing reliever. After striking out just over 12 batters per nine innings in college, Gerber has surpassed that number as a pro, fanning 13.6 batters per nine in his two pro seasons.

    SCOUTING REPORT: Gerber delivers an electric fastball that regularly touches 97-98 mph with a funky, crossfire delivery that gives batters uncomfortable at-bats, especially since he rushes his pitches from a quick set and quick action to the plate. Hitters get a short arm view from Gerber's low-three-quarters delivery. His 83-85 mph slider often flashes plus and pairs well with the heater. That's all he should need in his role as a potential high-leverage reliever, especially if he improves his below-average command.

    THE FUTURE: After splitting the 2019 season between high Class A Modesto and Double-A Arkansas, Gerber should break camp with Triple-A Tacoma to start the 2020 season. Don't be surprised if he gets big league time later in the year.

  24. 24. Wyatt Mills | RHP
    Wyatt Mills
    Born: Jan 25, 1995
    Bats: R Throws: R
    Ht.: 6'4" Wt.: 190
    Drafted/Signed: Gonzaga, 2017 (3rd round).
    Signed By: Alex Ross/Jeff Sakamoto.
    Minors: 4-2 | 4.27 ERA | 66 SO | 17 BB | 53 IP

    TRACK RECORD: Mills was slated to move quickly through the system after the Mariners drafted him in the third round in 2017 from Gonzaga, but the sidearm reliever spent all of 2019 at Double-A Arkansas followed by time in the fall with USA Baseball's Premier 12 team.

    SCOUTING REPORT: Using a funky, deceptive delivery with the ball looking like it's coming out of his hip, Mills primarily relies on his sinker/slider combo to dominate righthanded hitters. He consistently throws both pitches for strikes. The plus fastball sits 92-94 mph, touching 95-96, with tail and sink, and he's gotten more aggressive with it to the inner half of the plate against lefthanded batters. His average, sweepy slider with tilt sits 80-84 mph and also flashes plus as he uses it to get ahead in the count. Mills uses his 82-85 mph changeup more to lefthanded hitters but needs to be more consistent with the pitch.

    THE FUTURE: Mills profiles as a situational reliever most effective against righthanders. With improvement of the changeup, he could pitch in higher leverage situations. He'll head to Triple-A to start 2020 but will likely join the Tacoma-Seattle shuttle as bullpen reinforcements are needed by the Mariners.

  25. 25. Sam Haggerty | 2B/OF
    Sam Haggerty
    Born: May 26, 1994
    Bats: B Throws: R
    Ht.: 5'11" Wt.: 175
    Drafted/Signed: New Mexico, 2015 (24th round).
    Signed By: Jon Heuerman (Indians).
    Minors: .271/.376/.387 | 3 HR | 23 SB | 310 AB

    TRACK RECORD: As a table-setting second baseman for New Mexico, Haggerty hit .311 with a high walk rate in the high altitude of Albuquerque. He spent four nondescript seasons in the Indians' farm system, reaching Double-A, before he was traded to the Mets in January 2019 as part of the return for catcher Kevin Plawecki. He went 0-for-4 as a September callup, serving primarily as a pinch-runner. The Mariners claimed Haggerty off waivers after the season.

    SCOUTING REPORT: Haggerty played every position but first base and catcher in the minors in 2019 and drew attention in the Eastern League for his play at second base and also as the league's best baserunner. Haggerty is a 70-grade runner and switch-hitter who draws walks but makes virtually no extra-base impact. He is a spray hitter with well below-average power. Scouts prefer Haggerty in the outfield or at second base. His arm and footwork don't play as well on the left side of the infield.

    THE FUTURE: Haggerty has a modest ceiling afforded him by his speed, baserunning acumen and defensive versatility. His bat would need to find another gear to earn more than a utility role.

  26. 26. Jonatan Clase | OF
    Jonatan Clase
    Born: May 23, 2002
    Bats: L Throws: R
    Ht.: 5'9" Wt.: 180
    Drafted/Signed: Dominican Republic, 2018.
    Signed By: Audo Vicente.

    TRACK RECORD: Signed for just $35,000 in 2018, Clase surprised with a strong first pro season in the Dominican Republic when he posted a batting line of .300/.434/.444 with 31 stolen bases. He was extremely raw when he first came to the Mariners' academy in the DR but has made big strides through hard work. Clase has already added 30 pounds to his athletic frame by spending significant time in the weight room.

    SCOUTING REPORT: Clase's defining tool is his plus-plus speed, graded as a 70 runner on the 20-80 scouting scale. He uses a short, compact swing, making contact with sneaky power for his size. Clase's 18 percent walk rate is impressive for a player so unrefined. Currently he shows more range than feel in the outfield, with some of the routes he takes being called “adventurous,” but he has the closing speed to get to balls and will improve his routes with more experience.

    THE FUTURE: Clase will make his stateside debut in 2020 with an assignment to the Rookie-level Arizona League after time in extended spring training. He's an intriguing talent.

  27. 27. Juan Querecuto | SS
    Juan Querecuto
    Born: Sep 21, 2000
    Bats: R Throws: R
    Ht.: 6'2" Wt.: 175
    Signed By: Emilio Carrasquel/Tim Kissner.
    Minors: .203/.315/.241 | 0 HR | 2 SB | 79 AB

    TRACK RECORD: Querecuto has been on the Mariners' prospect radar since signing in 2017 for a $1.225 million bonus. He comes from a family of ballplayers, with father Juan playing in the Blue Jays' system and older brother Juniel a veteran minor league infielder who got into four games with the Rays in 2016. Querecuto made it to the states in 2019 but was limited by a knee injury that kept him out for most of extended spring training and limited his time in the Rookie-level Arizona League season to 23 games.

    SCOUTING REPORT: Querecuto is the type of player whose instincts allow him to play above his tools. More of a defense-first shortstop, he still has work to do to improve his glovework, especially on making decisions whether to charge balls or hold back. His athleticism allows him to make the tougher plays, with his plus-plus arm being one of the best in the organization. There's still plenty of development ahead as a hitter, but he made good strides during the Mariners' fall hitters camp in working on the movement patterns with his body in the box and being more selective.

    THE FUTURE: Querecuto may need more time in the AZL before he's ready to head to the next level.

  28. 28. Donnie Walton | 2B/SS
    Donnie Walton
    Born: May 25, 1994
    Bats: L Throws: R
    Ht.: 5'10" Wt.: 184
    Signed By: Ty Bowman.
    Minors: .300/.390/.427 | 11 HR | 10 SB | 480 AB

    TRACK RECORD: A prototypical grinder and baseball rat, Walton made it to the major leagues in his fourth pro season after a four-year career at Oklahoma State. His callup followed a strong performance at Double-A Arkansas, where he was a sparkplug who batted leadoff in the Travelers' order and saw time at both middle infield positions.

    SCOUTING REPORT: The son of Oklahoma State's pitching coach, Walton has the ceiling of a utility infielder at the big league level with a good chance of having a nice career in that role. He's gritty and plays hard and consistently performs above his tools. While he doesn't have the strength or bat speed to drive the baseball, he has a good approach at the plate, understands the strike zone and consistently puts balls in play. Despite having only average speed, Walton has good instincts on the bases. He's an average or slightly better defender at both middle infield positions, although a below-average arm is an impediment to regular play on the left side.

    THE FUTURE: Walton will head to spring training looking to earn a spot on the Mariners' 25-man roster as an extra infielder. He knows his role and thrives in being that extra guy.

  29. 29. Anthony Misiewicz | LHP
    Anthony Misiewicz
    Born: Nov 1, 1994
    Bats: R Throws: L
    Ht.: 6'1" Wt.: 200
    Drafted/Signed: Michigan State, 2015 (18th round).
    Signed By: Jay Catalano.
    Minors: 9-8 | 4.59 ERA | 125 SO | 35 BB | 132 IP

    TRACK RECORD: Misiewicz spent most of the 2019 season as a starting pitcher, but the value he can bring to a big league team is a bit more diverse. Spot starter? Long reliever? Lefty specialist? The answer is all of the above. After spending most of the season in Triple-A, Misiewicz easily fits the label of “major league ready.”

    SCOUTING REPORT: Often described in the past as being more of a finesse pitcher with good pitchability, Misiewicz improved his command and became more aggressive with his low-90s fastball, touching 94 mph with natural movement and good extension. He uses the heater to set up a curveball that flashes plus, and also mixed in a cutter/slider in the high 80s and an average changeup. Consistently scattering his pitches around the zone to keep batters from getting too comfortable, Misiewicz has been described as being effectively wild, using a delivery that has him falling off a bit toward third base.

    THE FUTURE: There's a really good chance that Misiewicz makes his big league debut at some point in the 2020 season, especially since he could be that staff 's Swiss army knife by filling multiple roles.

  30. 30. Jose Siri | OF
    Jose Siri
    Born: Jul 22, 1995
    Bats: R Throws: R
    Ht.: 6'2" Wt.: 175
    Signed By: Richard Jimenez (Reds).
    Minors: .237/.300/.357 | 11 HR | 26 SB | 468 AB

    TRACK RECORD: Siri was hampered in 2018 by a sprained thumb he suffered when he crashed into a wall in spring training. He returned healthy in 2019 and advanced to Triple-A, although he hit just .186 in 30 games at the level after a pedestrian showing at Double-A Chattanooga. The Mariners picked him up off waivers after the season.

    SCOUTING REPORT: Siri doesn't have much discipline at the plate, and coupled with a penchant for swinging and missing, he projects to be a below-average hitter. His raw power is plus, but he doesn't make enough contact to get to it in games. When Siri does manage to get on base, his plus speed and good jumps make him a dangerous stolen base threat. Siri has an excellent glove and strong throwing arm to boot, allowing him to profile at any outfield position.

    THE FUTURE: Siri is a high-energy player with plenty of tools, but his shortcomings at the plate may limit him to a reserve role. He will return to Triple-A in 2020.

View Players 11-30

Are you a member?

In order to access this exclusive content you must have a Baseball America Account. 

Login or sign up  

Additionally, you can subscribe to Baseball America's newsletter and receive all of our rankings, analysis, prospect insight & more delivered to your inbox every day. Click here to get started. 

of Free Stories Remaining