3 overlooked Mariners prospects making a play for attention early in 2026

The Mariners farm system was recently feted as the best in MLB, and there's more to that than Colt Emerson, Kade Anderson and the rest of the super-prospects at the top of the list. Its depth is a key part of its appeal, too.

So, let's check in on three overlooked prospects who are quickly making an impression in 2026. All three are outside the system's top 10 as ranked by MLB Pipeline.

These 3 Mariners prospects are putting themselves on the radar early in 2026

LHP Mason Peters, Single-A Inland Empire

MLB Pipeline Rank: No. 15

Kade Anderson was the Mariners' big prize in the 2025 draft, whereas fellow lefty Mason Peters was something of a wild card at No. 144 overall in the fourth round. He had primarily worked as a reliever for Dallas Baptist University in 2025.

The 22-year-old is now transitioning to starting, and the early returns are eye-popping. In three appearances for the 66ers, he's allowed seven hits and three walks while striking out 21 of the 45 batters he's faced. His curveball notably got the attention of Geoff Pontes of Baseball America, who remarked that opposing hitters simply can't touch it.

INF Brock Rodden, Triple-A Tacoma

MLB Pipeline Rank: No. 18

Brock Rodden has been in the system since 2023, and he's established a reputation for punching above his weight. He already has nine doubles through 20 games with the Rainiers, after hitting just 10 in 41 games throughout an injury-disrupted season in 2025.

Rodden also has just three walks against 24 strikeouts, so his hit tool is as much a question now as it's always been. But for what it's worth, he is batting over .300 from both sides of the plate, with an even distribution of five doubles as a lefty and four as a righty.

RHP Charlie Beilenson, Double-A Arkansas

MLB Pipeline Rank: No. 26

Charlie Beilenson turned 26 in November, so he's on the older side for a prospect. Yet things are starting to happen for him. Even before this season, he piggybacked a strong 2025 campaign with a spot on Israel's roster for the World Baseball Classic. He ended the event with two scoreless appearances to show for it.

Through four appearances for the Travelers, he's logged 6.2 innings and allowed three hits against one walk and 11 strikeouts. What he lacks in fastball velocity, he makes up for with a devastating kick-change that looks like a real swing-and-miss weapon.

Of these three, Beilenson might be the best bet to impact the Mariners this season. He still has the Triple-A level to conquer, but he's at an age and general stage of his pro career where Seattle can risk moving him quickly.

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