Red Sox Boost Roster with Rutschman, Send Mayer to Giants for Reliever Miller

Adley Rutschman was the No. 1 overall pick in the 2019 draft out of Oregon State and is under team control through the 2027 season, highlighting the high upside Boston added at the deadline.
Luis Arraez is hitting a league-leading .324 this season and has been a stronger defensive presence at second base, aligning with Philadelphia's plan to boost run production and defense.
The Dodgers added Tarik Skubal, described as a two-time Cy Young Award winner, bolstering their rotation as they push for a World Series run.
Erik Miller has emerged as a valuable bullpen piece for Boston, posting a 2.76 ERA with 45 strikeouts in 32 2/3 innings and staying under team control through 2029.
The Giants have moved aggressively for youth in a flurry of deadline deals, with Marcelo Mayer joining the club and the window closing on Mayer’s Boston tenure as San Francisco eyes a longer-term infield presence.
The Boston Red Sox traded top prospect Marcelo Mayer to the San Francisco Giants for left-handed reliever Erik Miller, ending Mayer's brief and injury-plagued tenure in Boston. CBS News reported the deal also included minor-league outfielder Carlos Gutierrez heading to Boston, marking one of the most notable prospect-for-reliever swaps of the deadline frenzy.
The move came as both clubs made waves on a busy trade deadline. The Red Sox also added catcher Adley Rutschman, while the Phillies landed three-time batting champion Luis Arraez — and the Dodgers grabbed Tarik Skubal to further cement their World Series hopes, according to Morning Journal.
Mayer was the fourth overall pick in the 2021 draft. He was once seen as a cornerstone of Boston's future. But injuries limited him to just 70 games, and the Red Sox chose to cash in his value now. Baseball America noted Mayer was a two-time Futures Game selection before the deal.
In return, Boston gets Erik Miller — a pitcher under team control through 2029. Miller posted a 2.76 ERA with 45 strikeouts in 32 and two-thirds innings this season. That kind of cheap, controllable bullpen arm is exactly what teams hunting a playoff spot want. The Red Sox get a reliever who can help them right now without breaking the budget.
Boston did not stop at the Miller trade. The club also added Adley Rutschman, the No. 1 overall pick in the 2019 draft out of Oregon State. Rutschman is under team control through 2027, giving Boston a strong catcher well beyond this season, according to Morning Journal.
Together, the Rutschman and Miller additions show Boston's dual strategy. They want to win now and still keep their future intact. Trading Mayer hurts the prospect cupboard, but landing two controlled players with real big-league value softens that blow.
San Francisco was one of the busiest teams at the deadline. The Giants moved out veterans and collected young talent. Mayer fits that plan perfectly — he is 22 years old and has a high ceiling as an infielder. The Giants are betting his best baseball is still ahead of him, according to Head Top Topics.
San Francisco also dealt Luis Arraez to Philadelphia in a separate move, rotating an experienced bat out for future assets. The pattern is clear. The Giants are not trying to compete this October. They are building for two or three years from now, with Mayer as a key piece of that future infield.
Philadelphia grabbed Arraez, who is hitting a league-leading .324 this season. The Phillies expect his high-contact bat to create more run-scoring chances for Bryce Harper and Kyle Schwarber. He also improves second-base defense, a spot Philadelphia wanted to shore up heading into October, according to Morning Journal.
The Dodgers may have been the day's biggest winners. They added Tarik Skubal, a two-time Cy Young Award winner, to an already loaded rotation. The Astros picked up catcher Daulton Varsho from Toronto, and the Cubs grabbed reliever Clay Holmes from the Mets. Every contender was looking to upgrade — and most of them found a way to do it before the clock ran out.
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