3 Mariners prospects next in line for promotions after Lazaro Montes, Michael Arroyo

The Mariners seem to be floundering at the big league level but their farm system is progressing swimmingly. It was recently announced that top prospects Lazaro Montes and Michael Arroyo would be headed to Triple-A Tacoma following strong results with Double-A Arkansas.

Given the organization's wealth of prospect talent, this naturally begs the question: Who's next?

The Mariners must consider minor legaue bumps for 2 pitchers and 1 shortstop

LHP Mason Peters (No. 14 SEA prospect)

Peters was drafted in the fourth round of last year's draft out of Dallas Baptist University, and has had an excellent first year of professional baseball. He has pitched a total of 44.2 innings over 11 starts to a stellar 1.41 ERA with a 3.14 FIP. He also has a 37.1% strikeout rate against a 4.7% walk rate, suggesting that he's able to pitch with control and get into favorable counts.

He has spent the entire year with Single-A Inland Empire, but looks like he's ready for the next step. Because of his lack of college innings, rushing him to Double-A would likely be a mistake, especially since the Mariners have had a habit of calling up starters from the Travelers directly, but a greater challenge in High-A could be what he needs to round out an impressive start to his career.

SS Felnin Celesten (No. 6 SEA prospect, No. 73 overall)

Although 2025 wasn't quite the year Celesten was hoping for, he has bounced back strong in 2026. He has spent the entire year with High-A Everett and has posted a 138 wRC+ with 12 home runs over 337 plate appearances. His 20.2% strikeout rate is the lowest it has been since his time in the Arizona Complex League and his ISO has taken a major step forward, from .099 in Single-A last year to .213 this year. He has also stolen 17 bases, a direct result of more opportunities from improved on-base abilities.

As a middle infielder, Celesten doesn't have the clearest path to the majors given the presence of Colt Emerson and resurgence of Cole Young but Seattle could still be incentivized to promote him if it helps improve his trade value at this year's trade deadline or over the offseason.

LHP Kade Anderson (No. 1 SEA prospect, No. 5 overall)

The front office has made it exceptionally clear that they plan to promote Anderson. His 1.36 ERA and 1.84 FIP across 72.2 innings in Double-A demonstrate that he's unchallenged at the current level of baseball, and it's time to take his talents to the big leagues. Unfortunately, despite his pitching prowess, the Mariners don't have a clear spot on the roster for him.

Some believe that the team will choose to deploy him out of the bullpen, others think that the organization could choose to trade away some of the excess in the rotation to make room for Anderson. Either way, the consensus seems to be that he will be called up and it's more of a question of when, not if.

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