SAN FRANCISCO — Barry Zito took a three-hit shutout into the ninth inning, Hector Sanchez's two-run double highlighted a four-run fifth and the San Francisco Giants rolled past the Atlanta Braves 5-2 on Thursday night for their fourth straight win. Fresh off a sweep at the rival Los Angeles Dodgers, the NL West leaders stayed hot on a chilly and fog-filled night along the bay. Zito (10-8) allowed five hits, struck out five and walked three before Freddie Freeman's two-run double off reliever Jeremy Affeldt broke up the shutout.