"All is good, Ready to go!" Stanton tweeted. "No worries my people."
The Marlins said Stanton was being treated for a bruise after he was hit by a fastball from New York Mets reliever Chris Schwinden in the third inning. Stanton was hit a team-high nine times last season.
The Marlins beat the Mets 4-2 in a game stopped after five innings because of rain.