Corbin looks to bounce back from his worst outing of the season when he tries to help the Arizona Diamondbacks win their third straight home series Sunday against the San Francisco Giants.After yielding two runs during his second complete game of the season against Cincinnati on Aug. 20, Corbin (13-4, 2.79 ERA) allowed a career-high nine in 5 1/3 innings of a 9-5 loss at Philadelphia last Sunday."It just wasn't my day," he said. "I left a lot of pitches up. I didn't have my best stuff. I feel bad about not going deeper into the game."Since going 12-1 with a 2.31 ERA in his first 20 starts and earning a spot on the NL All-Star roster, the left-hander is 1/3 with a 4.35 ERA in the last six.Corbin, however, has given up three runs in 14 2/3 innings while not factoring in the decision of two victories over San Francisco (60-75) this season.Arizona (69-65) snapped a three-game home slide to the Giants by beating them for the second time in eight meetings at Chase Field, 4-3 on Saturday. Eric Chavez delivered a game-winning single in the ninth as the Diamondbacks bounced back after stranding eight runners in Friday's 1-0 loss.They've posted 12 walk-off victories and 29 comeback wins this season."We've been good at it, it's just not a fun way to play baseball," Chavez said. "We've played so many extra-inning games, you just don't want to play like that. But we are good late. I don't know what that means, but that was a good one."That single is Chavez's only hit in 12 at-bats over five games since a stint on the disabled list due to hip and knee problems."He came to me during (batting practice) and said, `My swing stinks right now, but I might come through in a big spot," Diamondbacks manager Kirk Gibson said. "He hung tough a got a good pitch."Teammate Martin Prado, meanwhile, added three hits and batted .374 with 30 RBIs in 26 games in August.San Francisco's Hunter Pence had three hits Saturday and is batting .355 in his last eight contests. He's 8 for 17 his last four games at Arizona.Ex-Diamondback Yusmeiro Petit (1-0, 3.18) takes the mound for the Giants looking to build on his first start of the season when he gave up two runs and struck out six in six innings of a 5-3 victory at Colorado on Tuesday."He's been around, knows what he's doing out there," manager Bruce Bochy told the Giants' official website. "He showed it (Tuesday)."Recalled from Triple-A Fresno to replace the injured Matt Cain, Petit has made three appearances and two starts for the Giants since the start of last season. The right-hander went 9-19 with a 5.05 ERA in 56 games -- 35 starts -- for Arizona from 2007-09.