Posey powers Giants past Rockies with two three-run homers

Buster Posey hit two three-run homers and drove in six runs in the Giants' 10-5 win vs. the Rockies.DENVER -- 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. Posey led the charge with a towering homer to right-center off Carlos Estevez (1-2).

Posey also hit a three-run homer in the first…