Red Sox trade Marcelo Mayer to Giants for pitcher Erik Miller

Boston Red Sox have agreed to trade infielder Marcelo Mayer to the San Francisco Giants for left-handed reliever Erik Miller, sources told The Athletic. Mayer, who is currently sidelined with an arm injury, is expected to compete for a role with the Giants, potentially as a second baseman next season and as a shortstop option. Miller, under contract for three more years, joins Boston's bullpen, where he is projected to be used in middle-relief situations rather than as a closer. The Giants are also moving pitcher Caleb Kilian, leaving Dylan Smith as a leading candidate for the team's closer role.

"We believe this trade adds depth to our pitching staff while giving the Giants a versatile infielder," a spokesperson for the Red Sox said. "The acquisition aligns with our strategy to strengthen the bullpen for the upcoming season," a Giants representative added.