German Marquez, a 23-year-old right-hander who has been dominant in recent starts, will take the mound Tuesday for the Colorado Rockies against the San Francisco Giants. After coming back to win 9-8 on Monday, the Rockies will be trying to clinch the three-game series behind Marquez, who will face the Giants for the first time this year. Dereck Rodriguez, 26, who made his major league debut May 29 at Coors Field in a relief appearance, will make his first start there and first start against the Rockies.