Next » by Evan Vucci - AP

Washington Nationals starting pitcher Scott Olsen stretches his arm during the third inning of a baseball game against the Philadelphia Phillies on Saturday, May 16, 2009 in Washington. Olsen had an MRI on his throwing shoulder following Saturday's 8-5 loss to the Phillies, another setback for the worst pitching staff in the National League.(AP Photo/Evan Vucci)