Taylor Dollard, Seattle Mariners
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Sunday: Nos. 21-30, Nos. 11-20.
Monday: Nos. 6-10
Wednesday: No. 5
Thursday: No. 4
Friday: No. 3
Saturday, Feb. 27: No. 2
Sunday, Feb. 28: No. 1
Monday, March 1: Best Tools
Tuesday, March 2: How many Mariners prospects would be No. 1 elsewhere?
Wednesday March 3: Projected 2024 Lineup, Rotation, Bullpen
Thursday, March 4: Projecting the Top 10 Prospects after the season

The Seattle Mariners farm system is as deep as it’s ever been. There’s big-league talent beyond the club’s Top 20, including right here with Nos. 31-40. Below is the start of the Top 40, broken into groups.


31 Carter Bins C 2023 FIELD A+/AA
32 Alberto Rodriguez OF 2024 HIT A
33 Aaron Fletcher LHP 2021 SLIDER AAA/MLB
34 Kaden Polcovich 2B 2023 HIT A/A+
35 Damon Casetta-Stubbs RHP 2024 FASTBALL A/A+
36 Michael Limoncelli RHP 2025 CURVEBALL R
37 Kristian Cardozo RHP 2026 CURVEBALL R
38 Starlin Aguilar OF 2026 POWER R
39 Tyler Keenan 1B 2023 POWER A/A+
40 Taylor Dollard RHP 2023 CHANGEUP A


40. Taylor Dollard, RHP
Dollard is an athletic sinker-slider starter who came to pro ball with underdeveloped changeup and some concern about fastball value. At Cal Poly in 2019, he sat 88-89 mph a lot, but touched 91-92, and has some 93s on the board for some scouts.

There’s some physical projection left here, but he’ll need to answer some repertoire questions to stick as a starter. Seattle didn’t draft him in the 5th round last June because they thought he was the next great Mariners reliever, so he’s going to get a long look in the rotation, and the fact he throws a lot of strikes could go a long way. It doesn’t hurt that Poly is a pretty good school for arms.

39. Tyler Keenan, 1B/3B
Keenan is a big, slugging left-handed bat with significant concerns about his ability to man third base, which puts pretty much every ounce of pressure available on his ability to hit and hit with power.

He generates easy loft with a classic power swing but at Mississippi made consistent contact and proved adept at working counts and taking walks. He might be a three true outcome bat, but there are signs of more if given time to adjust to professional pitching.

38. Starlin Aguilar, OF
Aguilar, just signed in January out of the Dominican Republic, is a sturdily-built left-handed hitter with a chance to hit for corner-type power thanks to a short swing and plus bat speed.

Most project him to move from his listed position of second base over to third. I have him as an outfielder; there’s enough athleticism and arm to fit in left field and while he can field a ground ball, he lacks natural infield actions and likely outgrows both second and third, so I’m skipping that move, though Aguilar will be given every opportunity to prove he can handle it — and hit enough to profile there.

37. Kristian Cardozo, RHP
Seattle swooped in late on the Venezuelan Cardozo after the Los Angeles Dodgers back out in July, 2019. The right-hander offers some projection from his 6-foot-2, 175-pound frame (at signing), and a fastball already into the low-90s without much effort.

His 71-76 mph curveball has varied shapes, but projects as at least average, and he’s shown good feel for a tailing changeup.

Cardozo has a legitimate chance to develop as a starter and sure looks the part physically.

36. Michael Limoncelli, RHP
Limoncelli had Tommy John surgery before the Mariners made him their sixth-round pick back in 2019. He was up to 94 mph the previous summer with a projectable curveball.

He’s a good athlete with foundational arm action, and should be jumping out of his sleeves to get pitching again this spring. He’s likely to start the year in extended spring training, and may not leave Peoria all season, but once he’s rolling he could move quickly through the lower minors with command of his top two offerings.

35. Damon Casetta-Stubbs, RHP
Casetta-Stubbs, 21, was the club’s 11th-round pick in 2018 out of Vancouver, Wash., and has flashed four pitches and maturity in his 26 professional appearances.

He’s touched the mid-90s with his fastball, but as a pro he’s been more 88-92 mph. He has two breaking balls, both of which may be big-league pitches. The slider is the better of the two right now, and the changeup should develop over time thanks to consistent arm speed and deception.

DC-S, all 6-foot-4 and 230 pounds of him, remains a project and is future role is up in the air, but the physicality and projectable velocity suggest a strong chance of a valuable arm.

34. Kaden Polcovich, 2B
Polcovich was overdrafted in Round 3 last June, but he’ll do a lot of things that could push him through the minors fairly quickly.

First off, his only flaring weakness is power at the plate; he’ll make contact, draw some walks, he runs well and can play at least two infield positions — second base, third base — and should be able to handle at least left field, if not center if given the chance.

He will reach the gaps, so don’t let his 5-foot-10, 185-pound frame fool you … well, not too much, anyway, since most scouts tell me he’s more like 5-8. But he performed in his short time at Oklahoma State and the plate skills are legitimate.

33. Aaron Fletcher, LHP
Fletcher came over with Taylor Guilbeau in the deal with the Washington Nationals in July of 2019. He’s up to 96 mph when he’s right and the funk in his delivery offers deception, thanks to an aggressive from leg, a tucked front shoulder and a long slingshot-style arm path behind it all.

His slider is below average, though it plays up some as a sweeper versus lefties, but it lacks depth. He’s flashed a fringe-average changeup that may be key for his chances versus right-handed batters.

Fletcher is purely a reliever and made his debut last season, walking seven and striking out seven in 4.1 innings of work, showing off his profile in one simple line. If he throws strikes, he has a chance to stick this season and be a difficult at-bat, ala Tony Sipp.

32. Alberto Rodriguez, OF
Rodriguez is a difficult profile, since he comes to Seattle with corner-outfield defense and an up-the-middle bat. He’s just 5-foot-11 and 186 pounds, but has a compact swing and has made a lot of loud contact in the DSL and Gulf Coast League.

He should continue to show consistent contact rates, but the Mariners could view Rodriguez as a real candidate for some swing adjustments and a little more power, as scouts do like his quick wrists and ability to cover the strike zone.

He’s just an average runner with a 50-55 arm, so left field seems about right, but even without much power there’s a chance the bat value grows through on-base skills and a high average.

31. Carter Bins, C
Bins’ swing was a mess most or all his college career with aggressive rotation and too many parts, but he knows the strike zone and uses a lot of the field.

Seattle made progress in Year 1 with the swing and he smacked seven home runs in 49 games in Everett just weeks after signing. His bat speed is fringey, but he’s worked to shorten it with good results.

Bins has some defensive chops, and looked better late in the year in terms of getting his glove down and using his feet for lateral range. He has terrific arm strength, but his accuracy was inconsistent at UNLV and his first stint in pro ball.

Bins profiles as a backup led by above-average raw power and the ability to draw walks.

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Jason A. Churchill

Churchill founded Prospect Insider in 2006 and spent several years covering prep, college and pro sports for various newspapers, including The News Tribune and Seattle PI. Jason spent 4 1/2 years at ESPN and two years at CBS Radio. Find Jason's baseball podcast, Baseball Things, right here.