These are the Rockies, after all. So despite their tied-for-baseball-best 13-5 record, despite their 8-1 mark at Coors Field, injuries cause consternation. First, opening-day starter Jhoulys Chacin lands on the disabled list, with Tyler Chatwood in line to take his spot Wednesday. Then, first baseman Todd Helton, in a solid groove offensively, misses the weekend with a sore left forearm. Is the other snowshoe about to drop? Have the Rockies reached their zenith three weeks into their season with the upcoming schedule featuring the Braves, a seven-day roadie through Arizona and Los Angeles, followed by a homestand with the Yankees and Rays? Monday brought a postponement, creating a doubleheader Tuesday at 1:10 p.m. and 6:40 p.m. — and some good news. Helton's injury has improved after treatment to reduce the swelling, leaving him cautiously optimistic that he will avoid the disabled list. "I am very hopeful," he said Tuesday. Helton is hitting .268 with three doubles and 10 RBIs. He started the season 2-for-21, but has nine hits in his past 20 at-bats. The Rockies were waiting for MRI results on Chacin's stiff lower back but were not expecting bad news. Chacin's condition improved dramatically over the weekend. He wanted to stay off the DL, but the move was made Sunday for precautionary reasons. Chatwood was scratched from his Triple-A outing, leaving him available to make his Rockies season debut in the final game of the Braves series. Another postponement would push the starters back again, perhaps negating the need for Chatwood. Tuesday's forecast calls for a 60 percent chance snow throughout the day with temperatures in the 30s.