Colorado Rockies rookie sensation Clint Barmes is expected to miss at least three months after breaking his left collarbone in a fall while carrying groceries up the stairs in his apartment building. Barmes, a shortstop leading National League rookies in most offensive categories, will have surgery Tuesday and isn't expected to return until at least August. In an interview Monday, Barmes said he was returning home the previous night with groceries cradled in his left arm and a sweat shirt in his right hand. He got tired of waiting for the elevator and decided to take the stairs to his fourth-floor apartment. "I figured, I'm an athlete, I can walk up the stairs, it's not that big a deal," he said. "Obviously, if I had to go back, I would have waited, or at least been a bit more careful going up."