"It was a ball [thrown by starter Brandon McCarthy in the third inning] when Ian Kennedy was hitting," Roberts said. "It was a two-seamer that ran in and kind of got [Grandal's] thumb. As the game progressed it got a little bit worse."
The Dodgers plan to give Grandal a day off on Sunday. Barnes will start, but Roberts said Grandal will be available if needed for the series finale at 1:10 p.m. PT.