Erik Miller’s first day with the Red Sox came with almost no warning and even less sleep. He was getting ready for another game with the Giants when the trade popped up on a TV screen, and suddenly Boston had a new 6-foot-5, 270-pound lefty for the bullpen.
“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.”
That surprise quickly turned into a fresh start. Boston landed the 28-year-old reliever from San Francisco in exchange for former top prospect Marcelo Mayer, adding another hard-throwing option to a relief corps that already has plenty of late-inning muscle.
Miller brings more than size. The Missouri native went to Stanford, then entered pro ball when the Phillies took him in the fourth round of the 2019 MLB Draft.
He worked his way up through Philadelphia’s system, reached Triple-A, and then got shipped to the Giants for right-hander Yunior Marte in January 2023. By 2024, he had made San Francisco’s Opening Day roster and appeared in 73 games as a rookie, carving out a bigger role as the season went on.
Before arriving in Boston in 2026, Miller had gone 2-0 with a 2.76 ERA, 10 holds and four saves for the Giants. Two of those saves came in his final three outings with San Francisco, a sign of how much trust he’d earned.
The stuff is straightforward and nasty. Miller leans on a sinker that averages about 97 mph and a slider in the mid-80s.
According to Boston.com, hitters managed just .193 against the sinker and .125 against the slider. The sinker also helped him post a 53.4% ground-ball rate, which ranked in the 92nd percentile and gives Boston another weapon when it needs an inning to end on the dirt.
His path to this point hasn’t been smooth. Miller’s 2025 season ended with a sprained ulnar collateral ligament in his pitching elbow. He had put together a 1.50 ERA in 36 appearances before the injury, avoided surgery, then hit a setback during rehab and didn’t pitch again after July 2.
He did make it back in 2026, and that return restored him to a key bullpen job in San Francisco. Now he joins Boston alongside fellow lefty Jovani Morán, with Aroldis Chapman closing and Garrett Whitlock and Justin Slaten also working in high-leverage spots.
For manager Alex Cora, Miller adds another matchup piece. He can miss bats, get ground balls and handle late-game pressure. He also has some New England familiarity, having 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 days.
His Red Sox debut came fast. After a cross-country flight and not much rest, Miller entered Tuesday’s 14-2 win over the Chicago White Sox and struck out the only batter he faced on four pitches. There was one small reminder that he was still settling in: after the strikeout, he started drifting toward the home dugout the way he would at Oracle Park before catching himself and heading 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.”
He said the uniform itself made the moment feel different.
“When you have the Red Sox across your chest, that definitely feels a little bit different,” Miller said.
Boston didn’t get the usual trade-day buildup with Miller. It got the TV alert, the quick flight, and then a clean first impression: four pitches, one strikeout, and a new left-hander who already looks ready for the stretch run.
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