The Rockies have placed 35-year old righty starting pitcher Roy Oswalt on the 15-day disabled list due to a strained left hamstring. Oswalt has pitched in 4 games (all starts) for the Rockies this year and he is 0-4 with a 7.64 ERA and a 1.76 WHIP. Oswalt has given up 29 hits and he has walked only 2 batters in his first 17 2/3 innings while whiffing 23 batters. Oswalt has been replaced on the active roster by 27-year old lefty swinging outfielder Charlie Blackmon. Blackmon played in 13 games earlier this year for the Rockies and he was 6 for 26 (.231 avg, .605 OPS) with 4 runs scored, 1 homer, 2 RBIs and 1 stolen base.