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According to multiple people who were in the Red Sox clubhouse in 2025, each granted anonymity for their candor, the disconnect between Breslow and certain members of the coaching staff was well known last season. Breslow would occasionally ask Bregman for feedback, and Bregman became a consistent advocate for Fatse, Lawson and Cronin, crediting those hitting instructors for helping him return to an All-Star level.

At one point last year, according to people involved, Breslow asked the Red Sox coaching staff to begin documenting every pregame hitting and defensive drill done by each player, which some coaches found excessive and time consuming, further fueling a perceived lack of trust between the staff and the front office. At the start of the 2026 season, Breslow also took on some oversight of the team’s major league development process, a role that had previously been held by assistant general manager Paul Toboni, who left the club last season to run the Washington Nationals. Breslow did not replace Toboni.

Multiple people also singled out Campbell’s major league struggles as a source of Breslow’s frustration with the hitting department. Campbell was 22 and among the most highly touted prospects in baseball when — after a year and a half in the minor leagues, and only 19 games in Triple A — the Red Sox made him their Opening Day second baseman in 2025, signing him shortly thereafter to an eight-year, $60 million extension. Campbell had struggled in spring training, but internal metrics said he nonetheless would be one of the best hitters on the team.

Instead, Campbell failed to pull the ball — a weakness that had been discussed internally — and had a .664 OPS when the Red Sox optioned him back to the minor leagues in the middle of June. He hasn’t been back to the big leagues since, and there was a sense within the clubhouse that Breslow blamed Fatse for Campbell’s inability to live up to the projections.

Said one player: “Breslow hated that we wouldn’t ‘train’ the way he thought was optimal on the hitting side. I don’t even know what Breslow thinks is the proper way to train hitting.”

On lefties:

“I want to see Marcelo get some opportunities,” Tracy said before Monday’s game against the Blue Jays. “I’m not saying that tonight if something comes up and there’s a favorable matchup that we wouldn’t do that. I’m not saying that Marcelo is going to start against Tarik Skubal every time. But if there’s opportunities that we feel like we can give him a little bit more of that, we may do that.”

On shortstop:

“I think for right now Trev is our shortstop, and I think for right now, if he’s off, we’ll probably see Mona there,” Tracy said. “I’m going to let Marcelo settle in at second base for the time being.”