Left-hander Patrick Corbin will replace righty Josh Collmenter in the Arizona Diamondbacks' starting rotation Monday against the Miami Marlins. Collmenter, 0-2 with a 9.82 ERA in four starts, will become the team's long reliever. In four starts with Double-A Mobile, Corbin was 2-0 with a 1.67 ERA. "It's a tough decision," general manager Kevin Towers told MLB.com. "We've got several guys down there throwing well. He (Corbin) performed very well in spring training, he's been in pro ball maybe a little bit longer than some of the others. We've looked at the National League, and most clubs have been struggling against left-handed pitching."