Gausman was backing up home plate after allowing an RBI single to center field while Candelario, who was the on-deck hitter at the time, was moving toward the plate to signal to the oncoming baserunner.
Gausman and Candelario collided and both fell to the ground. Both players left the game.
Neither team had announced the nature of their respective players’ injuries, but Orioles trainers appeared to examine Gausman for a head injury. Candelario suffered an apparent knee injury.
Gausman, 27, went 11-12 with a 4.68 ERA last season with the Orioles.