Triston Casas appears to have suffered a serious leg injury.

The Red Sox first baseman was removed from Friday’s game in the bottom of the second inning after suffering a hard fall on a close play at first base. Casas was attempting to beat out a throw from pitcher Joe Ryan and appeared to slip as he stepped on top of the first base bag. The 6-foot-4, 244-pound Casas’s right leg then buckled under him as he crashed hard to the dirt and he remained on the ground in obvious pain.

Casas was immediately attended to by the trainer and eventually carted off the field on a stretcher. He was replaced in the game by Romy Gonzalez.

As of this writing the Red Sox have not provided an update on Casas’ injury or its severity.

Another major injury would be a huge setback for Casas, who missed a significant portion of last season as well due to a torn cartilage in his ribcage. So far this season Casas had gotten off to a tough start, batting .184 with three home runs and 11 RBI entering Friday, but he’d begun showing signs of a turnaround, batting .278 with a 1.069 OPS over his previous six games.