SAN FRANCISCO – Matt Cain walked off the mound to a standing ovation from an adoring crowd that hadn't seen the Giants play at home since their improbable World Series run last fall.The A's Daric Barton connects for a game-tying two-run single in the fifth inning at AT&T Park as Giants catcher Buster Posey watches. The 3-3 tie didn't last long, as the Giants' Aubrey Huff homered in the bottom half of the inning for the decisive run.Marcio Jose SanchezAssociated Press