The Colorado Rockies hope to build off a pair of dramatic Memorial Day victories when they resume their series against the Houston Astros at Coors Field tonight. The Rockies won both ends of Monday’s doubleheader in their last at-bat, with Jordan Pacheco’s tie-breaking single in the eighth inning giving the Rox a 9-7 win in the first game, and Dexter Fowler’s triple in the 10^th inning of the nightcap providing the winning run in a 7-6 triumph. Christian Friedrich takes the mound for the Rockies tonight. The rookie lefthander earned the win in his last start in Cincinnati, and will hope his second start in Denver goes smoother than his first, when he allowed eight runs in five innings in a loss to Seattle. ESPN Radio 1410 has the action tonight. Pregame coverage begins at 7:05 with the first pitch at 7:40.