"Whenever it feels better, I'm ready to go," Upton said as he sat at his locker after the game with his hand wrapped.
Manager Fredi Gonzalez said he will likely keep Upton out of the lineup for Friday's series opener. But the skipper seemed to think the veteran outfielder would return to action at some point this weekend.
"He's probably going to be pretty sore," Gonzalez said. "But that's fine. I'd rather take sore than the alternative. We'll go day-to-day with him."
This scare comes just eight days after outfielder Heyward fractured his jaw when he was hit with a 90-mph fastball by Mets left-hander Jon Niese at Citi Field. Heyward will be sidelined until at least the latter portion of September.
"You never want to get hit by a pitch in a fragile area," said Upton, who went 2-for-2 at the plate and scored on Brian McCann's decisive three-run homer in the third inning. "It's definitely a little bit scary."
After getting hit, Upton was briefly examined by assistant trainer Jim Lovell in front of Atlanta's dugout. When he walked toward first base, it appeared Upton was planning to stay in the game. But Gonzalez revealed that Upton thought he had to touch the bag before exiting.
"Instincts just take over," Upton said with a laugh.
Freddie Freeman entered as a pinch-runner and remained in the game at first base to start the sixth inning, while Joey Terdoslavich, who started at first base, shifted to left field.
Mark Bowman is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.