3 under-the-radar Mariners prospects primed to leap onto the map in 2027

There aren't many positives for the Seattle Mariners to take away from 2026, but one of them is that their ever-solid farm system remains in good shape.

They graduated four top-100 prospects to the majors throughout the year, and all four loom large when looking ahead to 2027. Colt Emerson could be the de facto starting shortstop, while Kade Anderson is all but assured to be a member of the starting rotation. Potentially, Lazaro Montes and Michael Arroyo could line up next to Julio Rodríguez in the outfield.

Meanwhile, Felnin Celesten and Jonny Farmelo are two more top-100 types who will be knocking on the door before long. Ace Reese? Yeah, he's pretty good too. In fact, he was so good after falling to the Mariners with the No. 24 pick in this year's draft that one can already imagine him becoming a Silver Slugger winner.

Of course, to name names like these is to play the hits everyone already knows. "Who's next?" is a better question, so let's take a closer look at three Mariners prospects who are relatively obscure right now, but who could change that by breaking out in 2027.

Nick Becker, Mason Peters and Jake Brown are next in line to arise as top Mariners prospects

SS Nick Becker

Becker was a second-round pick by the Mariners in 2025, and he represents somewhat of a risky venture based on where he's coming from. They drafted him out of Don Bosco Preparatory High School in New Jersey, which has produced only 13 draft picks and one major leaguer.

While we're tempering expectations, the 19-year-old's first full season as a pro was a mixed bag. Becker struck out in over 30 percent of his plate appearances both in the Arizona Complex League and with Single-A Inland Empire. He didn't hit much at all with the latter, posting only a .561 OPS in 29 games.

The plusses are very real, however. Becker used a 19.2 walk percentage to rack up a .407 OBP for the season, and he showed off his wheels by stealing 46 bases in 50 tries. While he only slugged .375 for the season, there should be more power to come once he fills out a 6-foot-4, 190-pound frame. As he also has the goods to stick at shortstop, it all makes for a compelling profile.

LHP Mason Peters

The Mariners chose Peters a couple rounds after picking Becker in the 2025 draft, with the No. 122 overall selection in the fourth round. Like Anderson, Peters skipped the rest of the 2025 minor league season and didn't make his pro debut until this year.

Despite the soft onramp, the 22-year-old lefty was unable to make it through 2026 unscathed because of forearm soreness that sidelined him for over a month in the middle of the summer. He also experienced turbulence after getting bumped from Single-A Inland Empire to High-A Everett. In four starts for the AquaSox, he served up 11 hits and seven walks over 14.0 innings.

On the whole, though, Peters handled 64.1 innings and finished with a 2.10 ERA, 0.948 WHIP and 4.6 K/BB ratio. He caught the attention of Baseball America early on, with the publication praising his curveball in particular. As he also has a usable slider and splitter and seems to hide the ball well, there could be something here even if he doesn't improve the velocity or shape of his fastball.

OF Jake Brown

Brown was the Mariners' next pick after Reese in the 2026 draft, and nabbing him at No. 65 overall looked like a steal at the time. He's now a top-10 prospect in the organization for Baseball America, so maybe it's a reach to treat him as if he's obscure.

We'll nonetheless stick with the theme, if for no other reason than because Brown was drafted in Reese's shadow and then stayed in Reese's shadow amid the latter's super-impressive debut. Yet the 21-year-old Brown was plenty solid in his own right, posting an .802 OPS in 24 games with Inland Empire.

Brown had an .870 OPS against lefties, which makes for a pretty good first punch against the notion that he can't be a complete professional hitter. He also showed off his power and speed with nine extra-base hits and seven stolen bases, plus some range out in center field. So this time next year, he may be a step above even Farmelo as the most exciting outfield prospect in the system.

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