(SportsNetwork.com) - Jake Peavy returns to San Diego for the first time since 2009 on Sunday when the San Francisco Giants and Padres play the finale of a four-game set at Petco Park.

Peavy, who has been dealing with some lower back discomfort, won a National League Cy Young Award for the Padres in 2007, but they shipped him to Chicago in 2009. After a stop in Boston, Peavy was traded back to the NL West last season for a stretch run with the Giants.

The 33-year-old righty resurrected his career in San Francisco and went 4-0 with a 1.15 ERA over his last six regular-season starts -- all Giants wins. Although he didn't pitch well for the Giants in the postseason, he re-signed with the team this offseason.

San Diego's all-time strikeouts leader with 1,348, Peavy has faced his former team just once, but did not get a decision, despite allowing just a run and four hits over five innings.

The Padres, meanwhile, will turn to righty Tyson Ross, who did not get a decision versus the Los Angeles Dodgers in his season debut. Ross gave up two runs and six hits in six innings of that one, a 7-3 win for his team.

Ross was 2-0 with a 2.70 ERA in two starts against the Giants a year ago.

After losing the opener of this set on Thursday, the Padres have roared back with wins in the next two, including Saturday, when they smacked World Series MVP Madison Bumgarner around in a 10-2 thrashing.

Bumgarner (1-1) was hit for five runs over the first three innings, and the Padres finished with 20 hits in a stark contrast from the 1-0 contests split by these NL West rivals to start the series.

"We were patient and aggressive at the same time," Padres manager Bud Black said. "We were ready to hit."

James Shields (1-0), who was on the losing end in two of Bumgarner's gems in last year's Fall Classic, tossed seven solid innings to pick up his first win of the season. He struck out seven, walked one and allowed only three hits -- one being Joaquin Arias' leadoff homer in the fourth.

San Diego's offense provided plenty of support. Matt Kemp registered four hits, Will Middlebrooks added three with two RBI, and Wil Myers and Justin Upton both totaled two hits, two runs scored and two driven in.

Bumgarner did not make it out of the dugout in the fourth having allowed 10 hits -- one more than he surrendered in his 21 otherworldly innings in the 2014 World Series.

"I was a little off," Bumgarner said. "I was battling to put pitches where I wanted to and wasn't very effective."

San Diego won 10 of its 19 matchups with the Giants last season.