Pinch-hitter Buster Posey came through with a two-run double in the eighth inning to rally the San Francisco Giants past the Colorado Rockies 6-5 on Saturday night. Scooter Gennett homered and Pablo Sandoval had three hits, including an RBI double, for San Francisco. Posey batted with two on against reliever Carlos Estevez (1-2) and lined a ball to right field to score pinch-runner Kevin Pillar and Austin Slater.