The one thing the Red Sox know about their situation at first base is that Triston Casas won’t play for the rest of the season. Casas ruptured his left patellar tendon on Friday and will soon have surgery that will require an extensive rehab.

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 suffered the injury when he beat a throw to first in Friday's game, getting stretchered off the field afterward.