Butler, 23, made his Major League debut June 6 at Coors Field against the Dodgers and allowed 10 hits and six runs in 5 1/3 innings in a 7-2 Colorado defeat. He reported to Coors Field the following morning with soreness under his right armpit and went on the 15-day disabled list until July 19, when he was optioned back to Double-A Tulsa, where he began the season.
Butler last pitched on Sunday in the final game of the Texas League championship series, which Tulsa lost, 5-0, at Midland. He gave up eight hits and five runs in five innings with no walks and five strikeouts.
Jack Etkin is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.