Buster Posey is rounding into form, looking more and more like the 2012 version of the player who won the NL MVP. Posey homered, doubled twice and drove in four runs, rallying the San Francisco Giants past the Colorado Rockies 12-7 on Tuesday night for their seventh win in eight games. His solo homer in the sixth keyed a three-run burst as the Giants raced back from a 7-1 deficit to remain on the heels of the Los Angeles Dodgers in the NL West. Posey's prodigious night pushed his average over .300 for the first time since May. ''He's on fire right now and looking really good,'' winning pitcher George Kontos said.