SCOTTSDALE, Ariz. -- Rockies left-hander Jorge De La Rosa exited after 2 1/3 innings of his Cactus League debut during Friday's 3-2 loss to the A's because of left groin tightness -- the issue that delayed him at the start of this spring.
De La Rosa, announced this week as the starter for the April 10 home opener against the Cubs, left after giving up a one-out single to the A's Billy Burns in the third. The plan was for De La Rosa to throw 45-50 pitches on Friday, and he walked off the mound with head athletic trainer Keith Dugger after 45 pitches.
Rockies manager Walt Weiss said he was evaluating De La Rosa hitter by hitter at the point of the injury, which occurred when De La Rosa dashed off the mound toward first base during Burns' single.
"He broke off the mound, and that's when he felt it," Weiss said.
Weiss called the groin issue "concerning," and he said the Rockies will monitor De La Rosa closely.
De La Rosa gave up a run on Joey Wendle's two-out double in the second. De La Rosa was charged with two runs -- Burns scored on Sam Fuld's triple off reliever Nelson Gonzalez on a ball that left fielder Kyle Parker lost in the sun. De La Rosa struck out three and gave up three hits and one walk.
De La Rosa did not address the media.
The lefty is 45-14 at Coors Field since joining the club in 2008, and his 69 wins in a Rockies uniform are three behind franchise leader Aaron Cook.
Thomas Harding is a reporter for MLB.com. Read his blog, Hardball in the Rockies, follow him on Twitter @harding_at_mlb, and like his Facebook page, Thomas Harding and Friends at www.Rockies.com. This story was not subject to the approval of Major League Baseball or its clubs.