Phoenix, AZ -- (Sports Network) - Scott Hairston's two home runs and three RBI gave enough insurance to Jake Peavy, as the San Diego Padres escaped with a 4-2 win over the Arizona Diamondbacks in a well pitched, middle installment of a three-game set.

Peavy (6-5) showcased his All-Star form by scattering three hits -- all doubles -- and two walks, while striking out six in seven shutout innings for the Padres, winners of back-to-back affairs for the first time since June 11-12.

Adrian Gonzalez added a solo home run and Trevor Hoffman recorded his 16th save of the season with a shaky ninth.

Doug Davis (3-4) was saddled with the loss despite giving up just three runs on seven hits to go with seven strikeouts in eight solid innings for Arizona, which has lost four of five.

"I felt good and didn't really get behind a lot of hitters," Davis said. "It was two mistakes and Scott is a guy that if you leave something up in the zone he is not going to miss it."

Orlando Hudson finished with two doubles and an RBI, and Stephen Drew hit a solo long ball in defeat.

After two scoreless innings, Luke Carlin led off the third with a single and moved into scoring position on a Peavy bunt. The sacrifice wasn't needed, as Hairston pounded a hanging curveball into the pool beyond the right-center field wall for a 2-0 Padres lead.

The score remained that way until the sixth, when Hairston stepped in again and smacked a leadoff shot over the left field wall for his second multi-home run game of the season.

"When you come back against a former team you want to do well," said Hairston, who spent the first three-plus seasons of his career with Arizona. "I think I didn't perform to my capabilities when I was given a chance [in Arizona]. If it is anybodys fault it was mine."

After Chase Headley was thrown out trying to score on a wild pitch to end the away seventh, Chad Tracy snapped Peavy's streak of 14-straight retired batters with a leadoff double.

The two-bagger didn't faze the reigning National League Cy Young winner, as he mowed down the next two hitters and got Miguel Montero on an inning-ending pop out to short.

Arizona finally plated a run with Peavy out of the game in the eighth. With Heath Bell on the hill, Alex Romero singled to start the inning and came around to score on Hudson's double down the left-field line.

Gonzalez added an extra insurance run an inning later, smashing a 3-1 offering from Tony Pena to right for his 22nd home run of the season and a 4-1 lead.

Drew made things interesting with a one-out solo blast to right off Hoffman. Montero singled two batters later to bring the tying run to the plate, but Romero flied out to right to end the comeback threat.

Game Notes

Peavy snapped a three-start winless streak...Hairston also had two homers against Philadelphia on April 29...It was Hoffman's first save opportunity since June 11...Peavy came into the game 10-10 in his career against the D'Backs with a 4.98 ERA in 23 starts...The season series is tied, 4-4...The D'Backs go for the sweep on Sunday with Randy Johnson (4-7) matching up against Josh Banks (2-3).