Wilmer Flores homered and Joey Bart and Austin Slater had two hits each to give the San Francisco Giants a 4-2 win over the Houston Astros on Wednesday. Slater drove in a run to put the Giants up in a two-run sixth, and an RBI double by Bart extended the lead to 3-0 in the seventh. Alex Bregman got Houston within a run with a two-run home run in the eighth before Flores added some insurance for the Giants with a solo shot in the ninth.