Madison Bumgarner (5-5, 2.88 ERA), who will start Tuesday's 7:15 p.m. PT game against the D-backs, has allowed three runs or fewer in 12 of his 15 starts. The Giants are 4-3 behind Bumgarner at home, compared to 3-5 on the road. He'll oppose right-hander Clay Buchholz (7-2, 2.25), who's 1-0 with a 2.77 ERA in three career starts against the Giants.