Braun left Thursday's game against the Atlanta Braves in the fifth inning because of the oblique injury, which forced him to the disabled list earlier this season.
After missing Friday's series opener in Miami, Braun was back in the lineup Saturday, batting second in the order for the first time since 2010. He went 1-for-4 with a run in the 2-1 loss.
Braun began the weekend hitting .289 with seven homers and 19 RBIs, but is 5-for-27 on the Brewers' current trip.
Brewers manager Ron Roenicke said Friday that the injury was probably a factor in Braun's recent slump.
"He's taking weirder swings than I've seen him take," Roenicke said. "If he's taking bad swings, something is going on."
The Associated Press contributed to this report.