Nate Schierholtz and Brandon Crawford each plated a pair to back seven strong innings from Barry Zito as the Giants swept a day-night Tuesday doubleheader against the Cubs with a 6-3 win in the nightcap at Wrigley Field. Zito, who was just lifted from the disabled list, gave up just two runs on four hits to pick up his first win of the season. Brian Wilson worked a 1-2-3 ninth to nail down his 24th save. Lou Montanez clubbed a two-run homer and Aramis Ramirez added a solo shot for Chicago. Rodrigo Lopez was tagged with the loss. In the opener, Pat Burrell clubbed a two-run homer and Aaron Rowand added a bases-clearing double as the Giants cruised to a 13-7 victory. Ryan Dempster will toe the rubber opposite Tim Lincecum in tonight's third installment.