DETROIT -- The Detroit Tigers have no explanation for their sudden offensive surge.
"Why do we do this?" Tigers manager Alan Trammell asked. "I have no idea. That's just part of baseball. There's really no answer for it."
On Tuesday night, the Tigers beat Jake Peavy 8-4.
The Tigers ended Eaton's eight-game winning streak. Eaton (9-2) said after the game that he struggled with a swollen right middle finger in his first loss since April 16. The finger will be examined on Thursday.
"This is definitely very disappointing," Eaton said. "I felt like I could have put a bunch of zeros up there tonight."
Eaton allowed six runs -- three earned -- on seven hits and two walks in 2 1/3 innings. Eaton had gone at least 4 2/3 innings in each of his 13 starts this season.
"He didn't have his good stuff, and in the second inning, he felt something in his middle finger," Padres manager Bruce Bochy said. "I could tell that he wasn't the same out there in the next inning."
"You can't explain this," Monroe said. "You can't expect to go into Coors and have the balls fly out of the park on their own. We needed this after that road trip."
Mike Maroth (5-7) ended a five-start losing streak, giving up one run on six hits in eight innings. He struck out five and did not walk a batter.
"Today felt good," he said. "I haven't been pitching with leads very often lately."
San Diego led 1-0 after just three pitches -- a single by Dave Roberts and a double by Khalil Greene -- but didn't put another runner in scoring position until Ryan Klesko reached second with one out in the ninth, and Robert Fick drove him in with an RBI single.
"That was pitching," said Phil Nevin, who went 0-for-4. "He didn't throw anything across the plate, at least not to me. He changed speeds and got a lot of groundballs."
The Tigers tied the game in the bottom of the inning on Rondell White's RBI single, then took the lead with three runs in the second.
Brandon Inge made it 2-1 with an RBI single, and Polanco followed with a two-run single between first and second. A walk and Eaton's second hit batter loaded the bases, but Ivan Rodriguez ended his second inning in a row with a flyout.
In the third, Monroe and Shelton started the inning with doubles, putting the Tigers up 5-1, and a one-out walk to Logan chased Eaton in favor of Darrell May.
May picked Logan off first base, but the speedy rookie easily beat Nevin's throw to second, and he later scored on Polanco's third single in as many innings.
Polanco is hitting .528 in a 14-game hitting streak that started in Philadelphia. He was traded to Detroit for Ramon Martinez and Ugueth Urbina on June 8.
"That's a professional hitter," Trammell said. "He's given us a spark, and it hasn't just been with his offense. He had three hits tonight, yes, but he also had two outstanding defensive plays. That's getting noticed."
Monroe's two-run homer, his eighth, made it 8-1 in the seventh.
- The Padres are 0-5 in Detroit, with the first three losses coming in the 1984 World Series.
- The Tigers lost half of their batting practice and the Padres missed all of theirs due to pregame rain showers.
- Eaton lasted just 4 2/3 innings in his first start of the year on April 6, and had gone at least five innings in each of his next 12 starts before Wednesday.
- Maroth's last win came against the Angels on May 14, his second win over Los Angeles in six days.
- Maroth's eight innings matched his longest outing of the year, set twice before.