Buster Posey and Andres Torres waited three hours before making their contributions to yet another walkoff win for the San Francisco Giants. Make it five such victories for the reigning World Series champions by early May. Torres lined a game-ending single to right field with two outs in the 10th inning to score Posey for the winning run, lifting the Giants to a 4-3 victory against the Philadelphia Phillies on Wednesday to avoid a sweep.