The Colorado Rockies have placed 26-year old righty starting pitcher Tyler Chatwood on the 15-day D.L. due to a mid-back sprain. Chatwood has pitched in 14 games (all starts) for the Rockies so far this year and he is 8-4 with a 3.15 ERA and a 1.23 WHIP. The Rockies have called up 26-year old righty reliever Scott Oberg to replace Chatwood on the pitching staff. Oberg pitched in 8 games (0 starts) earlier this year for the Rockies and he was 0-0 with a 4.76 ERA and a 1.50 WHIP. He has now pitched in 72 games (0 starts) in his first two years with the Rockies and he is 3-4 with 1 save, a 5.04 ERA and a 1.52 WHIP. The Rockies hope that Chatwood only has to miss a couple of weeks, as he has been by far the best pitcher in their starting rotation so far this year.