Officials say the 21-year-old Castillo is scheduled to be arraigned today. Video from the game shows Castillo throwing the ball but doesn't show where the ball landed.
The unidentified fan was treated at a nearby hospital and released, according to a hospital spokeswoman, who didn't know the extent of the fan's injuries.
Umpires ejected 15 players and the team's managers following the bench-clearing brawl that lasted about 10 minutes.
