Madison Bumgarner, who debuted with two shutout innings in a 9-9 tie against the White Sox on Monday, is not twisting as far back in his delivery as he did last year. He did not realize how exaggerated it was.

"Gradually, it was more and more," he said. "Before I knew it, I was spinning around like (Hideo) Nomo did."

Bumgarner hopes the shorter delivery will have two benefits: more consistency in his pitches and less time to the plate. The more he twisted, the more opponents ran. They attempted 14 more steals than in 2011 and their success rate rose from 52 percent to 73 percent.

In fact, Bumgarner allowed more thefts (27) than any other left-hander in the majors in 2012.

Catcher Buster Posey could see a difference against the White Sox, who took advantage of Bumgarner's rustiness with two singles and a walk.

"I've caught him before when he had a real good move to first base," Posey said. "Maybe with less of a turn, he'll get his old move back. He's pretty deceptive to runners when he's right."