MILWAUKEE (AP) -- Prince Fielder wants a blaring siren to be his signature sound.
It should serve as a less-than-subtle warning that the Brewers' slugger is rounding back into form.
Fielder homered to leadoff the eighth and helped scratch across another run with an unlikely steal of third to lift Milwaukee to a 4-3 victory over the Arizona Diamondbacks on Monday night.
"They said the siren sounds too much like an emergency," said Fielder, who liked the earsplitting noise he tested during batting practice. "I've never heard an emergency sound like that. Wow, if that happens, then I don't even want to be here if that's a real emergency. But hopefully they'll fix it for me. I like the sound."
Fielder, who went 3-for-4, drove a fastball by Arizona reliever Doug Slaten (0-2) 445 feet to left-center field where it bounced off a stadium support just below a "Vote Brewers" All-Star banner to give Milwaukee its first lead, 4-3.
"I'm just trying to put the swing I like to take on it, and not really try to manipulate it," said Fielder, who became the youngest player to ever hit 50 homers last season. "Sometimes you try to create a base hit or try to do something different instead of putting a good swing on it."
It was Fielder's third homer in the last four games and five of his nine this season have come against lefties.
"These lefties now are good, they basically get paid to get one guy out, that's me," Fielder said.
Said Slaten: "That's the guy on this team in that lineup that I'd be coming in to face, so I am looking forward to those situations. I was ready. I just threw a meatball up there for him."
Fielder's effort was almost for naught following a tenuous ninth.
The Brewers, who won their fourth straight, committed a pair of throwing errors by catcher Jason Kendall and third baseman Bill Hall to put men on first and second in the ninth. After a sacrifice bunt by Chris Snyder, who homered and drove in two, reliever Salomon Torres walked the bases loaded.
"I kept throwing away, away, away, away," Torres said. "Then I threw it in and froze him."
Trailing 3-1, the Brewers got a pair of unearned runs off errant throws in the seventh after chasing Diamondbacks starter Doug Davis from the game. Davis left with two on and no outs after a single and a walk in favor of reliever Chad Qualls.
Qualls loaded the bases when he threw wildly to first on a sacrifice bunt. Pinch-hitter Gabe Kapler hit a high chopper to third baseman Mark Reynolds and the catcher Snyder couldn't grab the wayward throw to the plate, allowing two runs to score. Qualls got out of the inning with a strikeout and a double play after loading the bases with a walk.
"It's frustrating for everybody. Everybody knows that defense wins games," said Davis, in his third start since returning from surgery to remove a cancerous thyroid gland on April 10. "Errors can cost you the whole year if you can't make the plays. But 99 percent of the time, we make those plays. It's the 1 percent that will never happen again."
Fielder, who also threw out Chris Young at the plate in the third after Reynolds' RBI single, had all the Brewers' offense until the seventh, scoring a run in the second after he singled and advanced to second on a wild pitch.
He then stole third -- his first steal this season -- after Davis didn't pay attention to him and scored on Hall's sacrifice fly.
"Everybody probably chuckled," Fielder said. "I'm a big-time third base stealer. I wouldn't say he wasn't paying attention, but I don't think anybody expected me to run. I just took a chance."
It was Fielder's 10th career stolen base. ... Diamondbacks 1B Conor Jackson (strained right quad) took batting practice. Arizona manager Bob Melvin said Jackson could be ready to return as early as Wednesday when the Brewers start LHP Manny Parra. ... Brewers RHP David Riske (hyperextended elbow) played catch on Monday, but Brewers manager Ned Yost said both he and RHP Eric Gagne (rotator cuff tendinitis) are at least a week away from returning. ... Arizona RHP Randy Johnson starts Tuesday. Johnson, 288-152 in his career, is tied with Roger Clemens for second on the all-time strikeout list with 4,672, trailing Nolan Ryan by 1,042. "He's gotten to the point that he's in a very elite crowd, as far as what he's accomplished," Melvin said.