The rookie right-hander cruised, needing just 100 pitches in his first complete game in just his seventh major league start. Jungmann walked two and struck out seven, allowing only three hits.
Jungmann retired 11 in a row at one point until Yasmani Grandal doubled to open the eighth inning. He moved to third on a ground ball then scored on a sacrifice fly, but the Dodgers' first run could only cut their deficit to six runs.
Brandon Beachy was effective at times in his first start back from Tommy John surgery, his first time on a major league mound since Aug. 20, 2013. But he only lasted four innings and 78 pitches, with more walks (three) than strikeouts (two).
"He looked like a guy who hadn't pitched in a while. His fastball command was in and out," manager Don Mattingly said after the game. "But also you could see what's there, if he could get his command where he needs it."
The Brewers scored three runs off Beachy, all in a weird sequence in the third inning.
After Jungmann singled to open the inning, his second major league hit, he remained on first with two outs in the inning. Ryan Braun then doubled off the left field wall, a ball that Andre Ethier had a chance to catch but didn't, then the ball weirdly caromed off his foot and over the wall, meaning both runners could only advance two bases.
That was a break for the Dodgers, because Jungmann would have scored easily on the play, but was forced to hold at third base. Don Mattingly opted to intentionally walk Adam Lind to load the bases so Beachy could face the right-handed Carlos Gomez.
That decision did not work out well, as Gomez drove a ball to almost the exact same spot, another seemingly catchable ball that Ethier couldn't corral. This one was a double that stayed in the park, allowing all three runs to score.
But the night was really all aout Jungmann, who pitched the first nine-inning complete game against the Dodgers this season.
Jungmann is the first pitcher to throw a complete game against the Dodgers within his first seven major league games since Jason Jacome of the Mets, who shut out the Dodgers in his second big league game on July 7, 1994.
Chin-hui Tsao pitched two more scoreless innings in relief, in his second appearance in as many days, helped out a bit on a fantastic throw from the right field wall by Yasiel Puig to nail Aramis Ramirez trying to extend a single into a double in the sixth inning.
Alex Guerrero grounded out as a pinch hitter in the sixth inning and is now 0 for his last 16.
Adam Liberatore allowed a home run to Gerardo Parra in the seventh inning, the first home run the southpaw Liberatore has allowed to a left-handed batter in the major leagues, in his 58th such plate appearance.
The Dodgers close out their pre-break schedule on Sunday afternoon, with Brett Anderson on the mound. The Brewers will send Kyle Lohse to the hill in the series finale.
Home run: Gerardo Parra (9)
WP -(4-1): 9 IP, 3 hits, 1 run, 2 walks, 7 strikeouts
LP - Brandon Beachy (0-1): 4 IP, 5 hits, 3 runs, 3 walks, 2 strikeouts