Griffey capped a four-run sixth inning with his 12th home run and fourth in as many games.
"He's hitting them like a vitamin, one a day," Reds manager
said. "That was a big game. It's been a long time coming."
Dempster (3-6) gave up eight hits, walked two and struck out seven to earn his first win in seven appearances.
"I just felt myself under control a lot more," Dempster said. "I just put everything from before behind me and went out there like a guy with no ERA. I didn't go out there looking to stop something. I was looking at it as I was just trying to execute pitches."
"He was throwing sliders for strikes," Brewers rookie
said. "He was working both sides of the plate. Anytime a guy has two pitches and he is hitting his spots and changing speeds effectively, he's going to keep us off balance."
Dempster held the Brewers scoreless through five innings and escaped a bases-loaded jam in the fourth.
"Anytime you do that as a pitcher and get out of there with no runs, it kind of fires up the guys," Dempster said. "They were able to get out there and get some runs in the sixth."
went 3-for-4 with two runs and two RBI and
had two hits and two runs for the Reds, who improved to 1-4 on their seven-game road trip.
D'Angelo Jimenez tripled to start the sixth, then scored on a fielder's choice by Larkin to snap the scoreless tie. Larkin advanced to second on an error by Helms, then made it 2-0 when Guillen singled.
"He's probably been our most valuable player this year," Boone said of Guillen. "He's been terrific. He's getting big hits."
(7-7) gave up four hits and six runs in five innings. Podsednik doubled in the ninth and has now reached safely in 41 consecutive games.
Vander Wal had two hits and scored a run for Milwaukee, which stranded 11 runners.
"We had numerous opportunities to score some runs," Brewers manager
said. "Especially the big one in the fourth. We had the bases loaded and no outs and we didn't come up with anything. Those are situations that in order for us to improve we're going to have to improve. We've been fighting those type of situations all year long."
The Brewers put their only run on the board in the sixth. Vander Wal led off with a double and later scored on a single by Helms.