Nolan Reimold was taken to a hospital after he was hit in the left side of the head by a fastball from Rays pitcher Alex Cobb on Friday.
The Baltimore left fielder immediately dropped to the ground and was face-down for several minutes while a hushed crowd watched nervously as Orioles trainers tended him.
"It's probably the worst feeling you can have as a pitcher," Cobb said afterward.
Reimold eventually walked to a cart, which took him off the field.
Reimold Hit In Head By Pitch, Taken To Hospital