Buster Posey hit a pair of three-run homers, including a tiebreaking drive as part of a six-run eighth inning, and the San Francisco Giants rallied for a 10-5 win over the Colorado Rockies on Saturday after their bullpen blew a lead. The Rockies were limited to one run over six innings by Madison Bumgarner, but erupted in the seventh against five San Francisco relievers to take a 5-4 advantage. San Francisco responded right back with six runs in the eighth.