2:35pm: The Nationals announced, via Twitter, they have accepted Rosenbaum back from Rockies and he will report to minor league camp.
12:58 pm: The Rockies are returning Rule 5 Draft pick Danny Rosenbaum to the Nationals, according to Amanda Comak of the Washington Times (Twitter link). MLB.com's Thomas Harding adds, also via Twitter, that the move will become official once Colorado's signing of Jon Garland is finalized.
The Rockies selected Rosenbaum with the third pick in December's Rule 5 Draft. In eight Spring Training innings for Colorado, Rosenbaum allowed four runs on nine hits and three walks without registering a strikeout.
Last season, Rosenbaum fired 155 1/3 innings over the course of 26 starts for the Nats' Double-A affiliate, compiling a 3.94 ERA, 5.7 K/9 and 2.3 BB/9. The Xavier University product was a 22nd-round selection by Washington in the 2009 draft.
The left-hander ranked as Colorado's No. 22 prospect, according to Baseball America, who said that he "had a decent chance to be a touch-and-feel lefty at the back of a big league rotation" thanks to his ability to command an 84-90 mph fastball and a solid change-up.