Evan Longoria and Darin Ruf launched back-to-back home runs in the second inning and the Giants spoiled Madison Bumgarner's return to San Francisco with a 4-3 win over the Arizona Diamondbacks on Saturday night. Bumgarner (0-4) came off the injured list to make his first start in nearly a month after recovering from a mid-back strain. ''I can find a lot of positive stuff about it for me,'' Bumgarner said.