CHICAGO (AP) - Ryan Dempster is still searching for that elusive first victory of 2012.

Dating to last Aug. 11, the Cubs right-hander has gone 16 starts without one. On Saturday night before a spirited crowd of 40,228 at Wrigley Field, Dempster had trouble with his command and surrendered back-to-back homers to Dayan Viciedo and A.J. Pierzynski in the third as the White Sox took a 7-4 victory at Wrigley Field.

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``Just didn't pitch well enough to win,' Dempster said.

``A loss is a loss. I don't really care who is watching. I don't like losing anytime. If there was one person in the stands or there was 40,000 people, to me it means the same thing and that's a loss. I don't take any one loss different than the others.'

Dempster (0-2) gave up seven hits and four runs with three walks and three strikeouts in six innings as the Cubs dropped to a season-worst 10 games under .500 with their fifth straight loss.

``I didn't do a good job of executing,' Dempster said. ``I walked Adam Dunn with two outs and nobody on and that cost us three runs. ... probably cost us the game.'

Dunn also homered in the eighth for the White Sox, his 13th of the season and 42nd of his career against the Cubs, second most among active players. He also drew four walks.

White Sox starter John Danks (3-4) was spotless before Alfonso Soriano doubled with one out in the fifth. Danks also walked Joe Mather before Koyie Hill lined out to end the inning. Pinch-hitter Tony Campana and Johnson singled to open the sixth, but the rally died when Starlin Castro hit into a double play.

``Four innings of perfect ball, so we're making it pretty easy on some pitchers who have been coming in struggling,' Cubs manager Dale Sveum said.

``We're making them look pretty good. Pitch counts and all that, we're just making quick outs and not really getting good pitches to drive.'

The White Sox opened the scoring when Alejandro De Aza singled to start the game, stole second and after a walk to Dunn scored on Viciedo's RBI single. Viciedo homered in the third after another walk to Dunn and Pierzynski followed with another drive over the fence.

White Sox star Paul Konerko, who'd been hit near the left eye with a pitch Friday and had to leave the game, had a shiner Saturday, but tests revealed no major damage and he hopes to play again Tuesday.

Viciedo wasn't supposed to start any of the three games at Wrigley Field as manager Robin Ventura planned to play Dunn in left field without the DH in a NL park. But when Konerko had to leave Friday's game in the third inning, Dunn moved to first and Viciedo took over in his familiar left field spot while batting in Konerko's cleanup slot.

Viciedo now has four homers in his last six games

``He's a pretty confident kid,' Dunn said. ``He never gets down on himself. He knows what he is capable of doing. `'

Danks got his first win since April 22, allowing three hits in 6 1-3 innings. It was his third career start at Wrigley Field, where he has allowed just two earned runs in 19 1-3 innings and is 2-0.

``This is an exciting game. The energy in the ball park. This is a game I enjoy throwing in, for sure,' Danks said. ``We will take all the runs we can get early. That's always a key. That allows us to relax and stay aggressive.'

Trailing 7-0 going into the bottom of the ninth, the Cubs got two-run homers from Alfonso Soriano and Joe Mather off Zach Stewart.

Notes: The White Sox have won 17 of the last 23 against the Cubs. ... Viciedo now has 10 RBIs in his last six games. ... C Koyie Hill, who had been playing Double-A in the Reds' organization hoping for another shot at the majors, got just that when the Cubs reacquired him and then put him in the lineup Saturday night. Starting catcher Geovany Soto went on the DL after knee surgery and backup Wellington Castillo has a sprained knee ligament. ... The White Sox go for the sweep Sunday sending out Jake Peavy (4-1) to face Paul Maholm (4-2).