SAN FRANCISCO, CA - SEPTEMBER 20: Jorge De La Rosa #29 of the Colorado Rockies pitches against the San Francisco Giants at AT&T Park on September 20, 2012 in San Francisco, California. (Photo by Thearon W. Henderson/Getty Images)
Buster Posey also connected for the Giants to back another strong start by Barry Zito (13-8) as San Francisco completed a four-game sweep.
Zito won his fifth straight decision and has done everything to earn himself a spot in the postseason rotation after being left off all three rounds for the 2010 World Series champions.
The second-place Dodgers were set for a night game at Washington, trailing by 9 1/2 games. San Francisco (87-63) moved a season-best 24 games above .500, its best since finishing the 2003 season 39 games over.
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