He was just glad manager Bobby Cox had not forgotten him.
"I thought that was pretty funny," Langerhans said of the fans who booed his introduction as a pinch-hitter. "I tried not to pay too much attention to that, you know? I'm pretty confident I can get the job done."
Julio Franco singled against Julio Santana (1-3) with one out and was replaced by Pete Orr. Adam LaRoche followed with a pinch-hit single before Johnny Estrada was intentionally walked to load the bases.
Langerhans, who replaced fellow rookie right fielder Francoeur, drove the ball past shortstop J.J. Hardy's diving attempt.
"I always try to be aggressive and use the whole field," Langerhans said. "Fortunately, I was able to go the other way with it and get the ball through."
Former closer Dan Kolb (2-5) pitched a scoreless ninth to earn the win. The Braves won for the 17th time in 22 games.
Lyle Overbay hit his 11th homer for Milwaukee, which has lost three straight after winning five of six.
Brewers starter Doug Davis allowed five hits, two walks and struck out four in eight innings. The left-hander was 0-2 with an 8.36 ERA in his last three starts away from Miller Park.
A victory would have given Davis 10 wins entering the All-Star break.
"That was something I really wanted," Davis said. "Kind of feels like deja vu from last year. They weren't biting tonight on my high pitches. They're a disciplined team."
Andruw Jones made it 1-0 with an RBI double in the fourth. Despite shattering his bat, Jones drove the ball to the left-field wall for his 66th RBI.
The six-time Gold Glove winner threw out Geoff Jenkins as he tried to score from second on Bill Hall's fourth-inning single. Brewers third-base coach Rich Donnelly regretted sending Jenkins after Jones' one-hop throw to catcher Estrada easily beat the runner.
"I made a bad mistake," Donnelly said. "As soon as I waved him, I knew he was going to be out."
Davis stayed in the game after Francoeur's hard liner into his right heel. He picked up the ball and tossed to Overbay for the first out of the fifth.
Braves starter Jorge Sosa allowed nine hits, including Overbay's tying homer in the sixth, walked none and struck out three in 5 1/3 innings. Manager Bobby Cox pulled Sosa after Jenkins and Hall singled with one out in the sixth, but Kevin Gryboski ended the threat by getting Damian Miller to ground into a double play.
The game was the first time rookies Francoeur and Andy Marte, the top two players in the Braves' organization, played together in the majors. They combined to go 0-for-6.
Francoeur, called up Thursday from Double-A Mississippi, thrilled Turner Field fans later that night with a three-run homer in the eighth. He understood Cox's decision to have Langerhans hit for him.
"Well, I knew there was a good chance Bobby would make the move," Francoeur said. "We had the pitcher's spot coming up, too, but you don't question a manager who's been as successful as him."
Cox made no commitment to how he will handle Francoeur, a first-round draft pick in 2002, and Langerhans, a third-round pick from 1998 who seemed to lose his job when the 21-year-old Atlanta native joined the team.
"We've got to use all the resources we can to win games, and that's what we're going to do," Cox said. "It's a team game. I'm sure Jeff understands."
- Brewers CF Brady Clark made a nice diving catch in center to rob Marcus Giles of a hit in the sixth.
- Braves rookie RHP Blaine Boyer pitched the seventh to extend his consecutive scoreless innings streak to 12.