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Triston Casas undergoes season-ending knee surgery at Mass. General Hospital

Less than two days after suffering a season-ending injury while running to first base, Red Sox first baseman Triston Casas went under the knife in the first step toward a lengthy comeback.

The Red Sox announced on Sunday that Casas underwent a successful “left patellar tendon repair” — with the procedure performed by Dr. Eric Berkson at Massachusetts General Hospital.

Speaking to reporters on Saturday, Red Sox chief baseball officer Craig Breslow confirmed that Casas would need surgery — and was not expected back for the remainder of the 2025 season.

“Unfortunately this is a serious one,” Breslow told reporters Saturday.