Washington Nationals starting pitcher Jordan Zimmermann delivers to the Houston Astros during the first inning in Washington on Wednesday, April 18, 2012. (AP Photo/Ann Heisenfelt)

Photo by: Ann Heisenfelt

Washington Nationals starting pitcher Jordan Zimmermann delivers to the Houston Astros during the first inning in Washington on Wednesday, April 18, 2012. (AP Photo/Ann Heisenfelt)