Jordan Zimmermann

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Washington Nationals starting pitcher Jordan Zimmermann (27) scratches his head as he talks with shortstop Ian Desmond during the fifth inning of a baseball game against the Chicago Cubs, Monday, Aug. 19, 2013, in Chicago. Shortly after the conversation Zimmermann gave up a three-run home run to the Cubs' Dioner Navarro. (AP Photo/Charles Rex Arbogast)

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Washington Nationals starting pitcher Jordan Zimmermann rubs up a new baseball after giving up a solo home run to St. Louis Cardinals' Matt Adams during the sixth inning of a baseball game Wednesday, Sept. 25, 2013, in St. Louis. (AP Photo/Jeff Roberson)

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Washington Nationals catcher Wilson Ramos, right, and starting pitcher Jordan Zimmermann celebrate their win against the Miami Marlins during a baseball game at Nationals Park in Washington, on Friday, Sept. 20, 2013. Zimmermann pitched a two-hit complete game shut out earning the Nationals a win of 8-0. (AP Photo/Jacquelyn Martin)

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Wearing a Washington Grays Negro Leagues throwback uniform, Washington Nationals starting pitcher Jordan Zimmermann throws during the first inning of a baseball game against the Kansas City Royals Saturday, Aug. 24, 2013, in Kansas City, Mo. (AP Photo/Charlie Riedel)