2025 Seattle Mariners Top 30 Prospects June Update
With catcher Cal Raleigh continuing to develop as a superstar and a deep rotation surviving a series of significant injuries, the Mariners’ big league club is right in the middle of a rather wide-open AL West division race.
Below the big leagues, the Mariners also boast one of the best farm systems in the game. It’s extremely top-heavy. The system has eight Top 100 Prospects as well as two other players, Harry Ford and Logan Evans, who don’t miss the Top 100 by much.
By the time you get to the second half of the Mariners Top 30, the prospect depth has taken a massive dip. But that’s a problem 25+ teams would be thrilled to have to deal with. The Mariners have a wide array of intriguing position prospects, they just don’t have as much back-end depth as some other teams.
Baseball America subscribers can see the complete updated Mariners Top 30 here.
Read on below for prospect graduates, risers, fallers, new additions and injury updates below. Top 30 updates for all 30 teams can be found here.
Graduates
Ben Williamson, 3B: The Mariners’ 2023 second-round pick put together a solid first professional season in 2024, hitting .283/.375/.394 across two levels. He started the season with Triple-A Tacoma before earning the callup to the big leagues on April 15. Since that time, Williamson has held down the everyday third base job, though his bat has been well below-average.
Carlos Vargas, RHP: After debuting with the D-backs in 2023, Vargas has carved out a regular role in the Mariners bullpen in 2025. He’s served as a steady groundball specialist this season.
Leo Rivas, 2B: Rivas was sharing the second base job before he was recently sent down, clearing a path for Cole Young to make his MLB debut.
Risers
Cole Young, SS/2B: Young hasn’t made a major jump in the rankings, but his strong May and big league debut is significant. He’s a very well-rounded prospect who does a lot well, even if he may lack a clear plus-plus tool. Doing that as a 21-year-old big leaguer gives him a lot of runway to add more power and keep improving defensively.
Ryan Sloan, RHP: Sloan entered 2025 as a popular breakout pick among scouts, and he’s shown flashes of why. While he’s mixed dominant outings with stretches of inconsistency, the raw ingredients are there for him to develop into a front-line starter.
Ashton Izzi, RHP: Izzi was rocked in his pro debut in 2023. He averaged more than two baserunners an inning and finished with an 8.35 ERA. Since then, he’s been on a one-man mission to ensure that never happens again. After missing the first month with an oblique injury, Izzi has effectively mixed his fastball, slider and changeup to baffle Northwest League batters.
Fallers
Tai Peete, OF: Peete remains a work in progress, and his development will likely come in fits and starts as he and the Mariners work on improving his swing. Right now, he’s in the midst of a step back. More advanced High-A pitchers have found him to be an easy mark because he can be beaten in the strike zone and he’ll chase pitches off the plate. There’s athleticism, power and the ability to play center field, but the bat is going to need time to catch up to the rest of his tools.
Josh Caron, C: Catching is hard, but considering Caron’s solid career at Nebraska, it’s been surprising to see him struggle so much in the Northwest League. Caron is struggling to make contact or make much impact when he does connect. Considering his defense is fringy, he has to hit more to be a potential big leaguer.
Injuries
Ryan Bliss, 2B: Bliss tore his left biceps on a swing during a game on April 8. He had surgery two days later and is expected to be out for the majority of the 2025 season.
Teddy McGraw, RHP: McGraw has struggled to stay healthy since his early amateur days. He missed the first two months of the season due to an elbow injury. McGraw returned to action in the Arizona Complex League on May 13 and has made four rehab appearances.
Brock Rodden, 2B: Rodden’s season has been plagued by injury. He hit the IL on May 2 with a second injury. He returned on May 10, only to head back to the injured list with an oblique injury four days later.
Hunter Cranton, RHP: Cranton was placed on the injured list on April 8 with a concussion and hasn’t pitched in 2025.
Grant Knipp, C/RHP: A two-way talent selected out of Campbell, Knipp had elbow surgery and is expected to miss all of 2025.
New Additions
Chia-Shi Shen, RHP: In his pro debut, Shen looks like a future back-of-the-rotation start with feel for three average pitches. He’ll likely jump to Low-A Modesto at some point this summer.
Luis Suisbel, 1B/3B: Suisbel is a minor league performer who continues to defy the odds. To hack it as a corner infield-only profile, he’s going to need to really hit.
Dawel Joseph, SS. Joseph is looking for a mulligan on his professional debut in the Dominican Summer League. So far, his return to the DSL has looked a lot better.
