Newcomb was checked by a trainer and walked off the field under his own power in the third inning, escorted by two trainers. After the game, a 6-5 Phillies win, Braves manager Brian Snitker said Newcomb passed the concussion protocol and will be monitored overnight.
"Hopefully he gets through the night, sleeps and nothing happens, and he wakes up and he comes in here good," Snitker said. "He's got a mark on his head. But even when he's out on the field, he's like, 'I know what happened; I didn't [pass] out or anything.' So we might've ... hopefully we dodged a bullet."
Newcomb told reporters that he "remembered the whole play," and that his head is sore.
"Just going to keep rolling -- I think I'm feeling pretty good," Newcomb said.
The ball was clocked at 102 mph and caromed off Newcomb's head and sailed into the netting behind the Phillies' dugout on the third-base side. Realmuto covered his mouth with both hands as he ran to first base on what went as a ground-rule double.
The play occurred in the third inning at SunTrust Park. Newcomb turned his head as the ball approached and knelt on the mound immediately after getting hit. Catcher Tyler Flowers had him stay down while a trainer and Snitker came out to tend to the left-hander.
Touki Toussaint came on in relief of Newcomb.
Information from The Associated Press was used in this report.