SAN FRANCISCO, CA - SEPTEMBER 17: Wilin Rosario #20 of the Colorado Rockies shows the ball to umpire Mark Carlson #6 after Rosario tagged out Brandon Crawford #35 of the San Francisco Giants attempting to score from second base on a single to left field in the fifth inning at AT&T Park on September 17, 2012 in San Francisco, California. (Photo by Thearon W. Henderson/Getty Images)
Madison Bumgarner (15-10) allowed one run and four hits in six innings while walking a career-high five. The lefty struck out six and relied on a strong defensive effort to extend San Francisco's lead to eight games over the idle Dodgers in the NL West.
Pence's RBI single off reliever Guillermo Moscoso (3-2) handed Colorado its 10th loss in 12 games.
Rockies starter Jhoulys Chacin gave up five hits and a run in five innings. He also doubled and scored on Josh Rutledge's triple in the fifth.
Four relievers held Colorado scoreless before Sergio Romo struck out pinch-hitter Jason Giambi for his 12th save in 13 chances.
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