Houston right-hander Spencer Arrighetti will wear a cast but not require surgery on his broken right thumb, manager Joe Espada said Wednesday. Arrighetti was injured when he was hit by a line drive while playing catch in left field before Monday night’s game at Seattle.

The diagnosis of a broken right thumb for Spencer Arrighetti before Monday’s series-opener at T-Mobile Park didn’t leave much in doubt when the Astros left the yard after a 4-3 loss to the Mariners, but the club made it official Tuesday afternoon,