Seattle Mariners

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.