The Phillies have placed Roy Oswalt on the 15-day disabled list retroactive to April 27th due to lower back inflammation. Oswalt has pitched in 5 games (all starts) for the Phillies so far this year and he is 3-1 with a 3.33 ERA and a 1.04 WHIP. The Phillies have called up 27-year old righty reliever Scott Mathieson to replace Oswalt on the pitching staff. Mathieson has already pitched in 2 games (0 starts) for the Phillies this year and he is 0-0 with a 10.80 ERA and a 4.20 WHIP. He has now pitched in 11 games (8 starts) in his first two years with the Phillies and he is 1-4 with a 7.62 ERA and a 1.82 WHIP. The Phillies will likely take their time with Oswalt and let him get fully healthy as either Vance Worley or Kyle Kendrick will replace him in the starting rotation until he is ready to return to action.