RESOLVING THE LEDGER
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See the full story · 2 sourcesWho Is Erik Miller? Meet New Red Sox Reliever Who Learned Of Trade On TV originally appeared on NESN .
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Erik Miller’s introduction to the Boston Red Sox began with a television alert he never expected to see. Boston acquired the 28-year-old left-handed reliever from the San Francisco Giants in exchange for former top prospect Marcelo Mayer. Miller received little warning that a deal was coming, learning about it while preparing for another game with the Giants.
“I didn’t really know until it flashed up on the TV when I was getting ready to go out and play catch,” Miller said Tuesday, according to Gabrielle Starr of the Boston Herald . “It wasn’t really much of a heads up, but that’s kind of how it is with some of these things.”
The surprising news soon gave way to excitement. Miller left San Francisco for a Boston team playing meaningful games and added another intriguing option to an already formidable bullpen.
So, who exactly is the newest member of the Red Sox?
Erik Miller Gives Boston Another Power Left-Hander
Miller is difficult to miss on the mound. The 6-foot-5, approximately 270-pound pitcher possesses the size and velocity to create an intimidating matchup for opposing hitters.
The Missouri native attended Stanford before the Philadelphia Phillies selected him in the fourth round of the 2019 MLB Draft. He climbed through Philadelphia’s minor league system and reached Triple-A before the Phillies traded him to the Giants for right-hander Yunior Marte in January 2023. Miller made San Francisco’s Opening Day roster in 2024 and appeared in 73 games as a rookie. He steadily earned greater responsibility, developing into a reliever trusted in important situations.
The lefty was 2-0 with a 2.76 ERA, 10 holds and four saves for the Giants before joining Boston in 2026. Two of those saves came during his final three appearances with San Francisco.
Miller primarily attacks hitters with a sinker averaging approximately 97 mph and a slider in the mid-80s. According to Boston.com, opponents batted only .193 against the sinker and .125 against the slider.
His sinker also helps him keep the ball on the ground. Miller produced a 53.4% ground-ball rate, placing him in the 92nd percentile. That ability could prove particularly valuable when Boston needs to escape an inning with runners on base.
Miller Overcame Significant Elbow Injury
Miller’s emergence is even more notable because his 2025 season ended with a sprained ulnar collateral ligament in his pitching elbow. He had recorded a 1.50 ERA across 36 appearances before the injury shut him down. Miller avoided surgery but encountered a setback during his rehabilitation and did not pitch again after July 2.
His successful return in 2026 allowed him to reclaim a prominent bullpen role in San Francisco. Boston now can deploy Miller alongside fellow left-hander Jovani Morán. Aroldis Chapman remains the closer, while Garrett Whitlock and Justin Slaten also have handled high-leverage innings.
Miller’s ability to generate ground balls, retire left-handed hitters and pitch late in games provides manager Alex Cora with another matchup option. He also has prior experience pitching in New England. Miller spent one summer with the Newport Gulls of the New England Collegiate Baseball League and another with the Orleans Firebirds of the Cape Cod Baseball League during his Stanford career.
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Erik Miller Makes Immediate Red Sox Impression
Miller had almost no time to become comfortable before making his Boston debut. After an early cross-country flight and limited sleep, he entered Tuesday’s 14-2 win over the Chicago White Sox. Miller struck out the only batter he faced on four pitches, delivering an efficient first look at what he can bring to Boston’s bullpen.
There still was a brief reminder that Miller was adjusting to a new home ballpark. After the strikeout, he instinctively started walking in the direction of the home dugout at Oracle Park before realizing he needed to turn the other way at Fenway Park.
“My natural reaction after I got the strikeout was to walk over to the other side, just like at Oracle,” Miller said, per Boston.com. “So I kind of had to revert back to the left.”
Miller acknowledged that wearing a Red Sox uniform carried a different feeling.
“When you have the Red Sox across your chest, that definitely feels a little bit different,” Miller said.
The television alert may have given Miller an unusual introduction to Boston, but his first appearance provided a more traditional welcome. Four pitches, one strikeout and one clean debut showed Red Sox fans why their club believes the imposing left-hander can help during a postseason race.
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