The left-handed Rosenbaum, who was on Washington's Triple-A affiliate, the Syracuse Chiefs, at the time of Colorado's Rule 5 selection, went 8-10 with a 3.94 ERA in 26 starts in the 2012 season with Washington's Double-A affiliate team, the Harrisburg Senators. Rosenbaum, at 6'1 and 210 pounds, has spent his previous three seasons in the minor leagues. He attended Xavier University in Ohio.
Also in the Rule 5 Draft, however, the Rockies lost right-handed relief pitcher Coty Woods, who was taken by the Texas Rangers off of Colorado's Triple-A affiliate, the Colorado Springs Sky Sox, according to The Denver Post's Troy Renck. In his 2012 season, primarily with the Double-A Tulsa Drillers, Woods was 4-4 with a 3.20 ERA in 61 game appearances.