CINCINNATI -- Hitting seventh is the perfect therapy for Geoff Jenkins.
Jenkins had just six hits in his previous 41 at bats (.146) before going 2-for-3 with a two-run single that snapped a 1-1 tie in the sixth inning.
"That was a big hit," manager Ned Yost said. "It was just a matter of time before he got it going, and this was a big first step."
"Obviously, it's nice to pitch in and help," Jenkins said. "There are times when you go through little ruts and you've just got to go battle. Last year, I was in a funk and (Yost) did the same thing. It lit a little fire under me. We're at the same point this year."
Damian Miller followed with an RBI single in support of Doug Davis (4-4), who hadn't won since beating the Reds on May 24. He gave up six hits and three runs with three walks and five strikeouts in six innings.
Brian Shouse, Jose Capellan and Dan Kolb combined to pitch the seventh and eighth innings before Derrick Turnbow got the final three outs for his 19th save in 23 opportunities.
The Reds have dropped five straight, after an eight-game winning streak. They also lost five straight from May 12-17.
The win was Milwaukee's first against Reds starter Bronson Arroyo (8-3), who was 4-0 with a 2.40 ERA in five previous career starts against the Brewers. He allowed nine hits and four runs with two walks and seven strikeouts in seven innings.
"You always try to take one game at a time," Arroyo said. "There are 162 games in a season, and you're going to have spells where you going down and down. Momemtum works both ways. When you're losing, it's easy to keep losing, just like it's easy to keep winning when you're winning."
Prince Fielder led off the second inning with a first-pitch homer to left, his 12th of the season. It was his second in his last three at-bats as he hit an eighth-inning homer to tie the game Monday night.
The Reds were hitless until Arroyo bunted safely up the third base line with one out in the third inning. Brandon Phillips followed with a double down the right field line, and Scott Hatteberg's sacrifice fly to center drove in Arroyo with the tying run.
Milwaukee loaded the bases with nobody out in the sixth before Fielder hit a chopper back to Arroyo, who started a pitcher-catcher-first base double play. Bill Hall walked to reload the bases and set up the back-to-back singles by Jenkins and Miller.
"If I hold them there, we have a chance to come back and take the lead," Arroyo said. "I got the play I needed, and I was glad to see Bill Hall at the plate, because he hadn't been swinging the bat too well against me, but I missed with the 3-2 pitch. Obviously, that was the biggest (plate appearance) of the game for me."
Rich Aurilia led off the sixth for Cincinnati with his eighth homer of the season, and Adam Dunn followed with his 22nd to make it 4-3.
"I made two bad pitches," Davis said. "You just tip your cap and concentrate on the next hitter. As long as they're solo, they don't hurt too bad."
Milwaukee restored a two-run lead when Carlos Lee scored from third on Esteban Yan's bases-loaded wild pitch in the eighth.
David Ross answered with his 10th homer and third in two nights in the bottom of the inning.
Lee added an RBI single in the ninth to make it 6-4.
The Reds hit back-to-back homers for the sixth time this season and second in two nights. Ross and Jason LaRue hit back-to-back homers on Monday. ... Fielder has homered in three consecutive games for the first time in his career. ... The Brewers won consecutive road games for the first time since May 26-27 at Philadelphia. They clinched their third road series win in 10 tries. ... Four of Arroyo's eight wins this season have come in the first game after Cincinnati losses.