Ryan Mattheus

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Washington Nationals pitcher Ryan Mattheus throws in the fifth inning of a baseball game against the Philadelphia Phillies, Saturday, May 3, 2014, in Philadelphia. (AP Photo/Laurence Kesterson)

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This is a 2014 photo of Ryan Mattheus of the Washington Nationals baseball team. This image reflects the Nationals active roster as of, Sunday, Feb. 23, 2014, when this image was taken. (AP Photo/Alex Brandon)

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Washington Nationals manager Matt Williams, left, talks with relief pitcher Ryan Mattheus during a spring training baseball workout, Monday, Feb. 17, 2014, in Viera, Fla. (AP Photo/Alex Brandon)

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Washington Nationals relief pitcher Ryan Mattheus signs an autograph for a fan during a break in their spring training baseball workout, Friday, Feb. 14, 2014, in Viera, Fla. (AP Photo/Alex Brandon)

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Washington Nationals manager Matt Williams, left, talks with relief pitcher Ryan Mattheus during a spring training baseball workout, Monday, Feb. 17, 2014, in Viera, Fla. (AP Photo/Alex Brandon)

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Washington Nationals relief pitcher Ryan Mattheus prepares to throw during the seventh inning of an exhibition spring training baseball game against the Detroit Tigers, Sunday, March 10, 2013 in Lakeland, Fla. (AP Photo/Carlos Osorio)

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This is a 2013 photo of Ryan Mattheus 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 relief pitcher Ryan Mattheus (52) shows his frustration after giving up two runs in the eight inning as the Washington Nationals lose to the St. Louis Cardinals 8-0 in game three of the National League Division Series at Nationals Park, Washington, D.C., Wednesday, October 10, 2012. (Andrew Harnik/The Washington Times)

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Washington Nationals relief pitcher Ryan Mattheus (52) sits in the dugout after giving up two runs in the eight inning as the Washington Nationals lose to the St. Louis Cardinals 8-0 in game three of the National League Division Series at Nationals Park, Washington, D.C., Wednesday, October 10, 2012. (Andrew Harnik/The Washington Times)