The Boston Red Sox recently had to make a change in the infield. Boston lost first baseman Triston Casas to a serious knee injury and it seems likely at this moment that he's not going to be back this year.

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

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 underwent successful surgery on Sunday that will require an extensive rehab.