Mar. 7 9:23 AM PT10:23 AM MT11:23 AM CT12:23 PM ET12:23 ET17:23 GMT1:23 10:23 AM MST12:23 PM EST12:53 PM VEN21:23 UAE11:23 AM CT-Dahl will be sidelined for at least two weeks due to a stress reaction in his rib cage. Analysis: Dahl underwent further medical evaluation on Monday that revealed his injury. He had been sidelined while dealing with discomfort in his upper back. The 22-year-old Dahl, expected to compete with Gerardo Parra for the starting left field job, will be re-evaluated in two weeks. A first-round pick (10th overall) of the Rockies in 2012, Dahl debuted in the majors last season, batting .315 with seven home runs and 24 RBIs in 63 games for Colorado.