Craig Stammen

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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)

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This is a 2013 photo of Craig Stammen of the Washington Nationals baseball team. This image reflects the Nationals active roster as of Feb. 20, 2013 when this image was taken.(AP Photo/Phelan M. Ebenhack)

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Washington Nationals player Craig Stammen, far left, Washington Capitals player Matt Hendricks, second left and Washington Nationals player Ross Detwiler, far right, pose with unidentified people during a USO tour. (Courtesy of Matt Hendricks)

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Capitals forward Matt Hendricks (center, holding banner) and Nationals pitchers Craig Stammen and Ross Detwiler, pose with troops at the transit center in Manas, Kyrgyzstan during their USO Tour in December. (Photo courtesy Matt Hendricks)

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Craig Stammen

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Craig Stammen hasn't started a game all year but he might be called on to start for the Nationals on Sunday. (Associated Press)

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Washington Nationals' relief pitcher Craig Stammen pitches against the Chicago Cubs during their baseball game at Nationals Park, Wednesday, Sept. 5, 2012, in Washington. (AP Photo/Richard Lipski)

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The Nationals' next closer likely will come from among Tyler Clippard, Craig Stammen and Sean Burnett. Clippard was an All-Star in the set-up role last season, Stammen is 3-0 with a 1.44 ERA and Burnett has 10 career saves. Henry Rodriguez lost the job after a series of wild outings. (Associated Press)

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ASSOCIATED PRESS Washington Nationals starting pitcher Craig Stammen throws to the Florida Marlins during the first inning of a baseball game in Miami, Sunday, July 18, 2010.