The Giants begin a two-city, six-game trip on Monday with a 12:10 p.m. PT Labor Day matinee at Denver's Coors Field. Madison Bumgarner, who has yielded one earned run in his last 15 innings spanning two starts, will pitch the series opener for the Giants. San Francisco must sweep the three-game series to sustain its flickering postseason hopes. Colorado, in the midst of the scramble atop the National League West, will throw left-hander Tyler Anderson at the Giants.