CHICAGO -- Cub starter Ryan Dempster could’ve asked what he has done to offend the baseball Gods after finishing the first two months of the season without a win.

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AP Photo/Charles Rex ArbogastRyan Dempster's outing on Wednesday was his worst of the season.

While most of his starts have had a large measure of bad luck involved, Wednesday’s no-decision in the Cubs’ eventual win was more about a lack of execution.

Dempster lasted 4 1/3 innings allowing three two run home runs -- including two by former White Sox outfielder Carlos Quentin.

“It upset me today just for the fact I didn’t do my job,” Dempster said. “It’s different if you go out there and do your job and not get the win.”

Dempster deserves a mulligan after pitching his heart out without any run support in his first eight starts of the season. During his time on the mound prior to Wednesday, the Cubs scored only 12 runs all season for him.

“We fought our way back to win … so I really don’t care about that,” Dempster said.

Darwin Barney’s walkoff home run in the ninth inning helped the Cubs sweep the Padres, and get the veteran pitcher off of the hook.

“That’s the hardest part of this game,” Barney said. “For about a month and a half, Dempster was the best pitcher in the game, and we couldn’t do anything for him on offense.

Dempster has not won a game since Aug. 16, 2011, covering a span of his last 18 starts. During those outings he’s posted a solid, if not stellar, 3.75 ERA.

“He didn’t have his split, he didn’t have his slider “ said manager Dale Sveum. “He was kind of out there without a lot of bullets, and he could not keep his fastball down when he threw that.”

The 4 1/3 innings were the fewest Dempster has thrown all season, and the three home runs were the most he’s given up since April 23, 2011, against the Dodgers.