The Boston Red Sox will not have their starting first baseman for the rest of the 2025 Major League Baseball season. Triston Casas suffered a serious knee injury that will keep them out of action for the rest of the season.

Casas was removed in the bottom of the second inning after suffering what manager Alex Cora described as a “significant (left) knee injury.”

Triston Casas was penciled in as the team's starter at first, but Boston failed to address adding depth behind him during the offseason. Injuries last season limited Casas to just