Okay, look, being an Inland Empire 66ers fan in their first year as our Mariners’ A-ball affiliate was a brutal ride, wrapping up the season with the second worst record in the California League. It was a tough year, no doubt, especially trying to fill the shoes of the dominant Modesto Nuts. Many of the college draftees from the 2025 class bypassed A-ball entirely, heading straight to Everett, which left the 66ers a bit short-handed. But even with all that, this team had some absolute studs who made the year exciting, particularly in the second half, and a bunch of the system’s top 20 prospects showed up here at some point.
The Pitching Staff Was DEALING, Even When the Wins Weren’t
While the overall 59-72 final record stings, and that first half showing of 28-38 with a -52 Run Differential was rough, things took a real turn in the second half. The team flipped to a 31-34 record and a +39 Run Differential, showing some serious fight. What was clear all season long was the strength of the pitching. The 66ers’ team ERA of 5.04 was second best in the Cal League, which is just wild considering the team’s record. And get this: they LED the entire California League in K/BB ratio with a scorching 2.80! That’s how you know the arms in our system are legit, even if the bats weren’t always there, with the team OPS finishing seventh in the league at .755.
Mason Peters Just Went Full Beast Mode
If you weren’t paying attention to Mason Peters this year, you missed something special, buddy. He was easily the biggest riser of any Mariner prospect in 2026, absolutely dominating in his first pro season through the Cal League. This dude posted 50.1 innings pitched, racked up an insane 68 punchouts to just 12 walks, and threw a mind-blowing 1.43 ERA. He was so good, he earned a promotion to Everett late in the summer! Peters might be undersized and not overpowering with velocity, but his ability to spin the baseball and his feel for that fastball-breaker combo are next level. He’s one of the most exciting prospects in our entire system, for real. While Ryan Sloan is still ahead, Peters has a super strong argument for being the second best arm in the organization’s minor league ranks. We were seeing flashes early, too, with a tweet from April 18, 2026, showing him dealing: 4 innings, 4 hits, 1 run, 1 walk, and 7 strikeouts. In his first three pro games, he was rocking a 3.00 ERA over 12 innings with 7 hits, 3 walks, and 21 Ks. He’s primed for a massive 2027 season at High-A, and man, Seattle can’t wait to see it!
Ace Reese Smashed His Way Onto the Scene
And then there’s Ace Reese. Holy smokes! This kid came out of the 2026 MLB draft and made it crystal clear he had nothing to prove at A-ball. He was one of, if not the strongest performer of anyone drafted in the entire class. Reese just absolutely obliterated opposing pitchers, smashing his way to an OPS of nearly 1.200. His line was an absurd .440/.530/.667. That’s not just good, that’s video game numbers. He’s a talent that screams future M, and he’s going to be so much fun to watch as he climbs the ladder.
So yeah, the 66ers might’ve had a rough go on paper, but the individual talent flashing in Inland Empire this year, especially on the mound with Peters and at the plate with Reese, tells us our Mariners system is absolutely LOADED. Keep an eye on these names, because they’re going to be rocking T-Mobile Park sooner than you think. The future for our M’s is looking bright!
This article was created with AI assistance and published under Seattle On Tap’s editorial standards. See our Editorial Policy.
Originally reported by Lookout Landing.
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