Joe Panik homered for the second straight night, Jeff Samardzija had another strong outing and the San Francisco Giants made it two in a row in Arizona with a 3-1 victory over the Diamondbacks on Friday night. Samardzija (5-2) pitched out of trouble early and went eight innings for the third time this season, giving up a run and scattering eight hits to improve to 4-1 in his last five starts. Shelby Miller (1-4) blanked the Giants on four hits through five innings but faltered in the sixth, allowing two singles and Panik's three-run homer.