5 Mariners candidates to be next to crack MLB Pipeline's top 100 prospects

MLB Pipeline dropped the latest update to its top 100 prospects last week, and the Seattle Mariners are predictably well-represented with six players. And this is though they had even more top-100 talents not too long ago.

Colt Emerson only recently lost his status as a prospect, after all. The Mariners also had Harry Ford and Jurrangelo Cijntje once upon a time, before trades took both of them out of the system while they were still rated as top-100 talents.

These 5 Mariners prospects are already showcasing talent worthy of top-100 consideration

What we're getting at is that if Jerry Dipoto knows how to do anything, it's dig up talented prospects. And if it's a question of who could be next to join MLB Pipeline's top 100, the list starts with a guy who might be Cal Raleigh's heir apparent.

C Luke Stevenson, High-A Everett

MLB Pipeline Mariners Rank: No. 7

Might as well start with the obvious, since Luke Stevenson is the next man up in Seattle's system as far as MLB Pipeline is concerned. He's a for-real catching talent with a strong arm and receiving chops, and he checks boxes as a high-OBP and high-SLG bat. His first 109 games in the pros have produced a .421 OBP and 17 home runs.

Stevenson is unfortunately rocking a 28.5 K% this year, which is high for a 22-year-old at the Single-A level. To keep his stock trending upward, he'll either need to make more contact or keep paying for low contact with more walks and more power.

3B Ace Reese, Single-A Inland Empire

MLB Pipeline Mariners Rank: No. 8

It's only been a few weeks since the Mariners took Reese out of Mississippi State with the No. 24 pick in the draft. He's hit the ground running in his first seven professional games, collecting 12 hits in 23 at-bats, including three for extra bases.

The Mariners have touted the 21-year-old Reese as "one of the top three hitters in the country." That will ultimately depend on how much contact he makes, and even that won't answer the question of where he fits best on defense. He's a third baseman who might have to move to first base or left field.

INF Nick Becker, Single-A Inland Empire

MLB Pipeline Mariners Rank: No. 10

Nick Becker has fanned in 33.9 percent of his plate appearances this year. It's not good even for a kid who's still just 19 years old. This has happened all in complex ball and at Single-A, where he also has just nine hits in 46 at-bats.

However, that Becker has also walked in 20.3 percent of his plate appearances is an encouraging sign. He's also stolen 41 bases in 44 tries, and there might be some future power lurking in his 6-foot-4, 190-pound frame. If he's able to stick at shortstop, he'll be able to maintain a high ceiling to counteract the low floor he's shown this year.

LHP Mason Peters, Single-A Inland Empire

MLB Pipeline Mariners Rank: No. 11

Mason Peters is the other lefty the Mariners took in the 2025 draft, landing on him with the No. 122 pick in the fourth round. He has more than out-pitched whatever billing he had then, making 15 starts and posting a 1.34 ERA and 5.69 K/BB ratio in the low minors.

The 22-year-old Peters is only 5-foot-11, 175 pounds, with a fastball that has strong but not exceptional velocity in the 93-96 mph range. Yet the curveball is a true hammer, and it's a terrific sign that he's holding both righties and lefties to averages in the .100 range.

C/OF Boston Smith, Double-A Arkansas

MLB Pipeline Mariners Rank: No. 13

As wild as it sounds, the deal that sent Luis Castillo to the Chicago White Sox in July might already be the "Boston Smith trade."

Smith was an unheralded sixth-round pick by the Washington Nationals in 2025, but he has broken out as one of the hottest hitters in the minors this season. He has a 1.059 OPS and 28 home runs overall in 90 games, and he's only gotten hotter (1.191 OPS, 6 HR) since joining the Mariners' system.

Nobody seems to know where Smith fits defensively, and his 28.2 K% is indeed unbecoming for a 23-year-old who has only recently been bumped up to Double-A. Yet given that he has a 20.4 BB% next to a .325 ISO, he clearly has swing decisions and slugging efficiency down pat.

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