Washington Nationals

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Washington Nationals manager Davey Johnson watches from the dugout during the first inning of a baseball game against the San Francisco Giants in San Francisco, Tuesday, May 21, 2013. (AP Photo/Jeff Chiu)

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Washington Nationals' Rafael Soriano celebrates after the defeat of the San Francisco Giants in a baseball game on Wednesday, May 22, 2013, in San Francisco. (AP Photo/Ben Margot)

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Washington Nationals' Bryce Harper celebrates after scoring against the San Francisco Giants in the 10th inning of a baseball game Wednesday, May 22, 2013, in San Francisco. Harper scored on a hit by Nationals' Ian Desmond. (AP Photo/Ben Margot)

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San Francisco Giants' Gregor Blanco celebrates after hitting a triple off of Washington Nationals pitcher Rafael Soriano to score Andres Torres during the ninth inning of a baseball game in San Francisco, Tuesday, May 21, 2013. (AP Photo/Jeff Chiu)

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Giants third baseman Pablo Sandoval celebrated a 464-foot walk-off home run to beat the Nationals, 4-2, on Tuesday night. (Associated Press photo)

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**FILE** Washington Nationals' Danny Espinosa, right, looks back at home plate umpire James Hoye after being called out on strikes to end the top of the seventh inning of the baseball game against the Pittsburgh Pirates on Friday, May 3, 2013, in Pittsburgh. (AP Photo/Keith Srakocic)

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**FILE** Washington Nationals relief pitcher Ryan Mattheus (52) throws during an interleague baseball game against the Chicago White Sox at Nationals Park Thursday, April 11, 2013, in Washington. The Nationals won 7-4, sweeping the Chicago White Sox in the three game series. (AP Photo/Alex Brandon)

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San Diego Padres' Kyle Blanks, right, rounds the bases with a fifth-inning home run as Washington Nationals pitcher Dan Haren, foreground, walks off the mound during a baseball game in San Diego, Sunday, May 19, 2013. (AP Photo/Lenny Ignelzi)