Washington Nationals

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Washington Nationals shortstop Ian Desmond and center fielder Denard Span celebrate their back-to-back home runs in a win over the New York Mets. (Associated Press photo)

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Washington Nationals third baseman Ryan Zimmerman celebrates his walk-off home run against the New York Mets with first base coach Tony Tarasco. (Associated Press photo)

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Washington Nationals right-hander Drew Storen was optioned to Triple-A Syracuse on Friday night. (Associated Press photo)

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Washington Nationals shortstop reacts after striking out in the third inning of the Nationals' 11-0 loss to the New York Mets. (Associated Press photo)

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Washington Nationals outfielder Bryce Harper celebrates his first career walk-off home run, which gave the Nationals a 9-7 win over the Pirates on Thursday. (Associated Press photo)

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Washington Nationals manager Davey Johnson argues with home plate umpire Mike Winters as Winters ejects him from Thursday's game against the Pirates. (Associated Press photo)

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Washington Nationals manager Davey Johnson walks off the field after a blown call ended his team's comeback and sealed a 4-2 loss to the Pittsburgh Pirates. (Associated Press photo)