Braun was hit by a pitch from Cincinnati's Bronson Arroyo in the fifth inning of the Reds' 4-0 win Friday night. The ball hit Braun in the left forearm and deflected across his hands, catching his right thumb. X-rays on Saturday found no fracture.
"It's better today," said Braun, who had the thumb wrapped after getting treatment.
He was replaced in left field by Frank Catalanotto. Manager Ken Macha wasn't sure whether Braun would have to miss more than the one game.
"I'm just going by what the trainers tell me," Macha said. "They say it's day to day. We'll see what happens."
Braun received the most votes for an NL outfielder in the All-Star game Tuesday. He went 0 for 2 in the game, reflecting his recent struggles at the plate. Braun hasn't driven in a run in his last 11 games and has only two hits in his last 20 at-bats, dropping his average to .310.
He stayed in the game Friday after getting hit by the pitch. When he came to bat again in the seventh inning with the bases loaded and one out, the right thumb bothered him.
"I had trouble holding onto the bat with the thumb," Braun said.
He grounded into a forceout that turned into the final out when Brewers runner Mike Cameron was called for interference at second base.
Macha could use Jody Gerut or Bill Hall in the outfield to get the Brewers through Braun's absence. Gerut has been primarily a pinch hitter since the Brewers got him from San Diego on May 21 for Tony Gwynn -- he's made five starts, including four in center and one in right.
Hall has started 48 games at third base and one in left field, the first time in his career that he started there.