Seattle Mariners Top 25 Prospects

Below is an analysis of the prospects in the farm system of the Seattle Mariners. Scouting reports were compiled with information provided by industry sources as well as my own observations. This is the sixth year we’re delineating between two anticipated relief roles, the abbreviations for which you’ll see in the “position” column below: MIRP for multi-inning relief pitchers, and SIRP for single-inning relief pitchers. The ETAs listed generally correspond to the year a player has to be added to the 40-man roster to avoid being made eligible for the Rule 5 draft. Manual adjustments are made where they seem appropriate, but we use that as a rule of thumb.
A quick overview of what FV (Future Value) means can be found here. A much deeper overview can be found here.
All of the ranked prospects below also appear on The Board, a resource the site offers featuring sortable scouting information for every organization. It has more details (and updated TrackMan data from various sources) than this article and integrates every team’s list so readers can compare prospects across farm systems. It can be found here.
| Rk | Name | Age | Highest Level | Position | ETA | FV |
|---|---|---|---|---|---|---|
| 1 | Colt Emerson | 20.4 | AAA | SS | 2026 | 55 |
| 2 | Ryan Sloan | 19.9 | A+ | SP | 2028 | 55 |
| 3 | Kade Anderson | 21.5 | R | SP | 2026 | 50 |
| 4 | Jonny Farmelo | 21.3 | A+ | CF | 2028 | 50 |
| 5 | Lazaro Montes | 21.2 | AA | RF | 2027 | 50 |
| 6 | Michael Arroyo | 21.2 | AA | 2B | 2027 | 50 |
| 7 | Jurrangelo Cijntje | 22.6 | AA | SP | 2027 | 50 |
| 8 | Felnin Celesten | 20.3 | A+ | SS | 2029 | 50 |
| 9 | Luke Stevenson | 21.4 | A | C | 2028 | 45 |
| 10 | Yorger Bautista | 18.3 | R | CF | 2031 | 40+ |
| 11 | Nick Becker | 19.1 | A | SS | 2031 | 40+ |
| 12 | Tai Peete | 20.4 | A+ | CF | 2028 | 40+ |
| 13 | Teddy McGraw | 24.2 | A+ | MIRP | 2027 | 40 |
| 14 | Griffin Hugus | 21.9 | R | SP | 2029 | 40 |
| 15 | Korbyn Dickerson | 22.2 | A | CF | 2029 | 40 |
| 16 | Robinson Ortiz | 26.0 | AAA | SIRP | 2026 | 35+ |
| 17 | Mason Peters | 22.0 | R | SIRP | 2027 | 35+ |
| 18 | Marcelo Perez | 26.1 | AA | SP | 2026 | 35+ |
| 19 | Christian Little | 22.5 | A+ | SIRP | 2028 | 35+ |
| 20 | Michael Morales | 23.4 | AA | SP | 2026 | 35+ |
| 21 | Blas Castaño | 27.3 | MLB | MIRP | 2026 | 35+ |
| 22 | Brock Rodden | 25.6 | AA | 2B | 2027 | 35+ |
| 23 | Luis Suisbel | 22.6 | A+ | 3B | 2028 | 35+ |
| 24 | Tyler Cleveland | 26.3 | AA | SIRP | 2026 | 35+ |
| 25 | Charlie Pagliarini | 25.1 | A+ | 2B | 2028 | 35+ |
Other Prospects of Note
Grouped by type and listed in order of preference within each category.
Depth Arms With a Dash of Upside
Po-Chun Lin, RHP
Chia-Shi Shen, RHP
Charlie Beilenson, RHP
Peyton Alford, LHP
Jimmy Joyce, RHP
Lin is a wild card. Signed out of Taiwan for $460,000 in the 2025 international period, he’s healthy now after not pitching in games after signing. There’s some push and pull everywhere in his profile. He’s touched the mid-90s but sits much lower. He’s a good athlete with body control but also a violent delivery. He was once a two-way player and now has two changeups. There’s just less known about him than pretty much anyone else on this list, to the point where I didn’t feel comfortable giving him a full profile. Signed out of a Taiwanese semi-pro league, Shen has great body control and a little deception from how long he holds on to the ball. He has a nice changeup, but the stuff is otherwise fringy. Beilenson’s blend of 70 control, average stuff, and below-average command is an unusual, dinger-prone mix. He could really use another tick or two, as his low-to-mid-90s fastball plays below the number. I’m skeptical Alford’s fastball will continue missing bats like it has against mid-minors competition, but he’s left-handed and has two above-average breaking balls, so he could find his way into the mix eventually anyway. Joyce once looked like a plausible backend starter prospect. He’s sputtered in the upper minors and is out until at least July with the shoulder injury that sidelined him last spring.
DSL Guys
Leandro Romero, SS
Elias Perez, OF
Manuel Almeida, C
Kendry Martínez, IF
Romero signed for $1 million in the 2024 international class. He’s an uber-projectable shortstop who hit much better during his second spin through the DSL, but I don’t love his swing. He’s the most interesting position player in the Others of Note section. Perez got $600,000 in the 2025 class and played center when Yorger Bautista wasn’t out there. He’ll either need to cut down on his swing length or get a lot stronger, but he has a plan and can hit a little bit. I’m concerned he may mature early physically. Almeida is a catcher with pop but a poor glove presently, and despite a good year overall, his lack of contact was concerning given the level. Martínez signed for $2.5 million prior to the 2025 season, but his first pro campaign was a disaster.
Undersized Older Signees Out of Mexico
Juan Cazarez, RHP
Francisco Pazos, RHP
Angel Chicuate, RHP
Maximo Rodriguez, RHP
Cazarez runs his heater into the mid-90s. He has a nice delivery and can spin it a bit, but he’s a stiffer athlete. He isn’t missing a ton of bats in a length role, but he might have the highest relief ceiling in this group. The square-bodied Pazos touches 95 and has some feel to throw strikes and spin the ball. Models seem to like him more than scouts. Chicuate is small and barely threw last year, but he touched 96 with interesting pitch data. Rodriguez, now 20, was signed out of the Mexican League, where he threw a handful of innings as an 18-year-old. Befitting a guy who was teammates with more than a dozen former big leaguers, he’s polished for his age. He’s a deceptive sinker-slider guy who generates huge tail and sink on his two-seamer, and pairs it with a pretty good breaking ball. He sits either side of 90 and isn’t physically projectable, but the story is good enough to flag, and there are plenty of guys who have turned worse ingredients into up-down careers.
Outfielders, Mostly From the Upper Levels
Rhylan Thomas, OF
Spencer Packard, LF
Victor Labrada, LF
Jared Sundstrom, OF
Carlos Jimenez, CF
Thomas debuted in 2025. He’s a spray hitter with lovely feel for contact and the strike zone, but I’d be rounding up to get him to 30 power and that’s a killer. I’m curious to see if he could hit .400 in Korea. Packard has a good approach, and a short swing helps him put seemingly everything in play. The contact isn’t very firm, though, and he’s below average in a corner. I’m skeptical he’ll make it work in the long run, but perhaps he can hit .275 for a stretch and give the big league club a complementary line-mover amidst all the power bats. Another Triple-A tweener, Labrada can hit a little, but he has a bunch of 40s everywhere else on the card. Sundstrom is a good athlete with tweener tools and an aggressive approach that caught up with him in Double-A. A Low-A repeater, Jimenez is a good athlete with average power and above-average speed but a 30 bat.
Walking in Reliever Wonderland
Grant Knipp, RHP
Michael Hobbs, RHP
Brock Moore, RHP
Stefan Raeth, RHP
Elijah Dale, RHP
Emphasis on the “walking.” Knipp was a two-way player at Campbell. He only pitched in four games there, but he touched 100 mph at the 2024 Combine. He had TJ just before the 2025 season; we’ll see what it looks like in 2026. Hobbs spins a plus curve and has an interesting mix of stuff besides. The effort in his delivery is such that I wince in sympathy on every pitch; we need not call the Hardy boys to figure out why he walks people. Moore touches triple digits and his slider flashes plus, but he’s a stiff athlete with a big head whack and bigger control problems. Raeth is trying to become the latest Washington Husky to play for the Mariners. He’s a spin-to-win righty who leans on his sweeper. He found a little extra gas in 2024, which breathed life into a guy who looked like an org arm earlier in his career. Dale’s feel to spin a hard sweeper with otherwise 30-grade velocity is an outlier trait; maybe it can be molded into something useful.
Backstop Backstops
Grant Jay, C
Josh Caron, C
Jay has good hands, a strong arm, and looks like a heads-up defender behind the dish. His bat is scary, though. He’s got power but also a bottom-hand dominant swing with a steep path and a ton of swing and miss against fringy competition. He could be a backup. Caron has the tools to be a bat-first catcher, but his aggressive approach was annihilated by A-ball arms.
System Overview
This is the most stratified system in the game. As Eric wrote last year, most farms this thin are among the worst in baseball, but Seattle’s isn’t just good, it’s great. Teams covet bats above all else these days, and the Mariners has five in the 50 FV tier or better, even after trading Harry Ford and graduating Cole Young. They have one low-variance 55 in Colt Emerson, with several possible stars lurking behind him. If they get two two-plus-win regulars out of that group, it’ll be a big shot in the arm for the big league club. If even half the 50s meet their projection, they’ll likely be annual pennant contenders.
Stars and scrubs is a risky way to build a farm system, and we generally favor a more diffuse spending approach, particularly in Latin America. The Mariners are the league’s best counterpoint to that philosophy. Even with a whiff here and there (Dawel Joseph signed for $3 million and may never escape the complex), Seattle’s success rate on big-dollar signees is very high. The scouting and dev system deserves a ton of credit for targeting elite and malleable talent, and has more than earned the benefit of the doubt with respect to how it operates. When you hit like this on your big swings, there’s no reason to dial things back.
Strangely for a club that scouts and develops so well, there are a lot of org guys filling space on the farm. For a player dev group that has succeeded in several different ways with various pitchers — think George Kirby’s velo spike, Bryce Miller’s split, Logan Gilbert’s evolving pitch mix and approach, stretching out Logan Evans, finding a lower slot for Tyler Cleveland, etc. — there’s a cookie-cutter feel to the system’s depth pieces. So many arms turn into spin-to-win sweeper monsters, oftentimes with lower slots on their breakers than the heat in a way that’s never going to fool quality hitters. Seattle has also punted on a couple of opportunities to collect depth on the position player side. The Mariners only have one DSL team, and most of the ACL lineup was hilariously old and tool-less for the level. Up and down the system, there are lots of players without projectable tools, many of whom have stuck around longer than they would have for other teams. This isn’t a criticism, just an observation and perhaps an inevitability with all the over-slot signees Seattle has prioritized. The shape of the system may be unusual, but it’s plenty functional.
Brendan covers prospects and the minor leagues for FanGraphs. Previously he worked as a Pro Scout for the Pittsburgh Pirates.
As fun as it would be for Cijntje to switch pitch in the major leagues, I think it’s time for the Mariners to stop using him as a left-handed pitcher. It reminds me of switch hitters who were so much worse at one side that facing the same side still produced better results.
I just don’t see a scenario where LHP Cijntje provides anything but entertainment value, as the RHP change up is plenty good enough to be effective against LHBs if he can command it more consistently.