But the Red Sox have the depth within their system to find a legitimate outside answer. And remember: the team managed to play .500 ball last year without having a full-time run-producer at first. With an improved rotation, a better bullpen and the addition of Alex Bregman, they should be able to survive.

Casas suffered the injury when he hit first base awkwardly trying to beat out an infield single in the second inning. He hit the bag and immediately crumbled to the ground, grabbing his left knee. Casas had to be carted off the field. Here's the play:

Triston Casas suffered a serious knee injury after a collision at first base in the second inning during Friday’s game against the Twins.