Chatwood started against the San Francisco Giants in place of Jeff Francis, who went on the 15-day DL with a left groin strain. The 23-year-old had a solid performance against the Giants, allowing one run on seven hits in 5 2/3 innings pitched.
The right-hander made two starts earlier this season for the Rockies, and has a 2.55 ERA through his first 17 2/3 innings this season. Chatwood has also pitched well for the team's Triple-AAA club, posting a 3.14 ERA in five starts for Colorado Springs.
The Rockies acquired Chatwood in the trade that sent Chris Iannetta to the Los Angeles Angels. Chatwood has bounced between the bullpen and starting rotation as well as between Triple-A and the major leagues the past three seasons. Chatwood is still young, and should get the chance to prove to the Rockies that he is a quality major-league arm.
Colorado recalled Scahill when they placed Francis on the DL. Scahill tossed five scoreless innings for the Rockies in two appearances out of the bullpen. The right-hander can be used as a long-reliever or a spot starter, so he will likely receive another promotion to the major leagues when the team needs a fresh arm.