An intrasquad matchup between two precocious talents Wednesday left Giancarlo Stanton dazed and Jose Fernandez shaken.

Stanton was hit in the back of the helmet in Jupiter, Fla., during a Miami Marlins intrasquad game by a fastball that got away from Fernandez, the team’s top pitching prospect. Stanton remained on his feet but left the game and said the beaning affected his eyesight.