Washington Nationals pitcher Craig Stammen bites on his jersey as he walks off the field at the end of the fourth inning of an exhibition spring training baseball game against the New York Mets in Port St. Lucie, Fla., Saturday, Feb. 23, 2013, in (AP Photo/Julio Cortez)

Photo by: Julio Cortez

Washington Nationals pitcher Craig Stammen bites on his jersey as he walks off the field at the end of the fourth inning of an exhibition spring training baseball game against the New York Mets in Port St. Lucie, Fla., Saturday, Feb. 23, 2013, in (AP Photo/Julio Cortez)