Boston Red Sox reliever Erik Miller, a midseason trade deadline acquisition, had a 2026 season that started with dominating performances but ended with major control issues, allowing six earned runs in his final five regular-season appearances and retiring just two of five hitters he faced in the Wild Card Series. Acquired for Marcelo Mayer, the expectations were sky-high for the lefty, and while he met them at first, things got wild by September.
The Untapped Potential and the Sudden Skid
Miller’s stuff is legit, no joke. He brings a unique combo of velocity and horizontal movement from his arm slot, making him a nightmare for lefties at the plate. That pitch delivers a massive ground ball rate and a tiny hard-hit rate, which is exactly what you want from a late-inning guy. Plus, his wipeout slider pairs perfectly, racking up a huge swinging strike rate and a 33% strikeout rate against left-handed hitters. Seriously, when he’s on, he’s got the tools to shut down lefties.
He even looked like a total steal right after the trade. Miller simplified his approach by ditching his four-seam and changeup, and it paid off big. In his first 11 games for Boston, he walked just 3 of 46 hitters, a tight 6.5% walk rate. That’s elite. But the “honeymoon period” ended hard. After that strong start, the wheels came off late in the regular season, and it just got worse in the Wild Card Series.
The Control Nightmare Is Real
Here’s the problem, and it’s a big one: Miller has serious control issues. Before he even got to Boston, he was rocking a 15% walk rate over 38 games with San Francisco. He cleaned it up for a bit, but man, September brought back the bad habits. He walked an insane 9 of 39 hitters that month, a 23% walk rate. That’s just not gonna cut it, especially when the games matter most.
In the postseason, the walks didn’t show up in the stat sheet, but the lack of command was still glaring. He left a sinker right over the heart of the plate to Ben Rice in the Wild Card Series, and yeah, that ball ended up in the bleachers. While it was technically in the zone (which, ironically, is often a problem for Miller), it was absolutely not where he wanted it. The next day, he surrendered a base hit to Cody Bellinger, extending the Yankees’ lead. Some might crush him for giving up hits on back-to-back days, but the Bellinger pitch was actually pretty good. Sometimes a good hitter just puts a great swing on it. That’s baseball. But the control issues? Nope, no defending those.
Miller was also thrown into the fire in both Game 1 and Game 2 of the Wild Card Series, entering in the fifth inning with two outs. In Game 2, he even came in with runners on first and third. This was pretty unusual, as his first appearance in August was the only other time he entered a game in the middle of an inning for the Red Sox. The big question for 2027 has to be whether Miller can finally fix those walks and become the lights-out lefty reliever he showed flashes of being.
This article was created with AI assistance and published under Seattle On Tap’s editorial standards. See our Editorial Policy.
Originally reported by Over the Monster.
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