Matt Cain pitched eight innings and allowed two runs Friday in the Giants' 6-2 win over the Diamondbacks. One down, two to go for the Giants, who badly need a sweep in San Francisco this weekend if they're going to catch the Diamondbacks. They're now five games back in the NL West. Cain is still just 3-4 despite a 2.45 ERA in 10 starts since the All-Star break.