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03/09/11 5:12 PM EST

Homer only blemish in Peavy's fine outing

SCOTTSDALE, Ariz. -- Barry Zito of the Giants and Jake Peavy of the White Sox, two pitchers with something to prove, both excelled Wednesday afternoon as San Francisco subdued Chicago, 4-2.

Zito became the first Giants pitcher to last five innings this spring. The left-hander allowed just one hit, Adam Dunn's two-out single in the fourth inning, while throwing 33 strikes in 50 pitches.

Zito not only was left off the Giants' postseason roster last year, but also was the subject of a San Francisco Chronicle report claiming that management had contemplated releasing him, though he's still owed a guaranteed $64.5 million on his seven-year, $126 million contract.

Peavy, striving to overcome a shoulder injury that limited him to 17 starts last year, worked 3 2/3 innings and, like Zito, yielded one hit: Aubrey Huff's two-out, fourth-inning homer that snapped a scoreless tie. Peavy, who threw two scoreless innings last Friday in his Cactus League debut, was removed after walking Buster Posey.

The Giants added three runs in the sixth inning off White Sox reliever Jeff Gray. Mark DeRosa singled and was replaced by pinch-runner Gary Brown before Andres Torres lashed an RBI double. Torres advanced to third on Freddy Sanchez's groundout and came home on Huff's single. Pinch-runner Darren Ford stole second base and scored on Posey's single.

Dunn broke up the Giants' shutout with a mammoth home run in the ninth inning off Jeff Suppan, who immediately gave up another homer to Stefan Gartrell.

Up next for White Sox: The White Sox had their first look at the defending World Series champion Giants on Wednesday and follow up with the defending American League champion Rangers on Thursday for the first time this spring. The game will take place in Surprise, with a 2:05 p.m. CT first pitch and Philip Humber making the start. A split squad then gets its first look at the new Salt River Fields at Talking Stick, when it takes on the D-backs with a 7:40 p.m. CT first pitch. Gavin Floyd, Chris Sale and Sergio Santos all are scheduled to throw in the night game.

Up next for Giants: The Giants will play their first of two consecutive exhibitions on the road Thursday when they visit the Cincinnati Reds, who are managed by ex-San Francisco skipper Dusty Baker. Madison Bumgarner, the Giants' No. 5 starter who worked three strong innings last Saturday against Oakland, will make his third Cactus League appearance. He'll oppose right-hander Bronson Arroyo.

Chris Haft is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.