Red Sox trade Marcelo Mayer to Giants for Erik Miller

The Boston Red Sox are trading infielder Marcelo Mayer to the San Francisco Giants for reliever Erik Miller, per The Athletic's Ken Rosenthal.

Mayer, 23, was once a top Red Sox prospect but has a .223 average with 7 home runs and a 0.3 bWAR in 332 MLB at-bats.

The Red Sox are parting with Mayer despite his team control through 2031, due to a crowded infield and his recent struggles.

Erik Miller, 28, has a 2.76 ERA, four saves, and 45 strikeouts in 32.2 innings this season, and is under team control through 2029.

The trade signals Boston's shift to other infield options like Caleb Durbin and Curtis Mead, and bolsters their bullpen with Miller.