David J. Phillip

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Washington Nationals third baseman Ryan Zimmerman fields a ground ball during a spring training baseball workout Sunday, Feb. 17, 2013, in Viera, Fla. (AP Photo/David J. Phillip)

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Washington Nationals outfielder Jayson Werth makes his way to a practice field during a spring training baseball workout Sunday, Feb. 17, 2013, in Viera, Fla. (AP Photo/David J. Phillip)

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Washington Nationals outfielder Bryce Harper throws during a spring training baseball workout Sunday, Feb. 17, 2013, in Viera, Fla. (AP Photo/David J. Phillip)

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Washington Nationals shortstop Ian Desmond throws during a spring training baseball workout Sunday, Feb. 17, 2013, in Viera, Fla. (AP Photo/David J. Phillip)

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Washington Nationals' Bryce Harper waits for a pitch during a spring training baseball workout Sunday, Feb. 17, 2013, in Viera, Fla. (AP Photo/David J. Phillip)

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Washington Nationals outfielder Denard Span throws during a spring training baseball workout, Sunday, Feb. 17, 2013, in Viera, Fla. (AP Photo/David J. Phillip)

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Washington Nationals first baseman Adam LaRoche throws to home during a spring training baseball workout on Sunday, Feb. 17, 2013, in Viera, Fla. (AP Photo/David J. Phillip)

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Washington Nationals first baseman Adam LaRoche, right, races his son Drake, left, during a spring training baseball workout on Sunday, Feb. 17, 2013, in Viera, Fla. (AP Photo/David J. Phillip)

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Atlanta Braves outfielders B.J. Upton (2), Jason Heyward (22) and Justin Upton (8) make their way to a practice field during a spring training baseball workout Friday, Feb. 15, 2013, in Kissimmee, Fla. (AP Photo/David J. Phillip)

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Atlanta Braves outfielders Jason Heyward (22), B.J. Upton, center, and Justin Upton, right, stretch during a spring training baseball workout Friday, Feb. 15, 2013, in Kissimmee, Fla. (AP Photo/David J. Phillip)

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Houston Astros manager Bo Porter talks to his players as they stretch during a spring training baseball workout Wednesday, Feb. 13, 2013, in Kissimmee, Fla. (AP Photo/David J. Phillip)

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Houston Astros manager Bo Porter smiles as he talks with reporters before a spring training baseball workout Wednesday, Feb. 13, 2013, in Kissimmee, Fla. (AP Photo/David J. Phillip)

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Washington Nationals manager Davey Johnson talks with players during a spring training baseball workout Thursday, Feb. 14, 2013, in Viera, Fla. (AP Photo/David J. Phillip)

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Washington Nationals pitcher Stephen Strasburg throws during a spring training baseball workout Thursday, Feb. 14, 2013, in Viera, Fla. (AP Photo/David J. Phillip)

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Washington Nationals pitcher Jeremy Accardo tosses the ball to home plate during a spring training baseball workout Thursday, Feb. 14, 2013, in Viera, Fla. (AP Photo/David J. Phillip)

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Washington Nationals pitcher Stephen Strasburg tosses the ball to home plate during a spring training baseball workout Thursday, Feb. 14, 2013, in Viera, Fla. (AP Photo/David J. Phillip)

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Washington Nationals pitcher Jeremy Accardo fields a ground ball during a spring training baseball workout Thursday, Feb. 14, 2013, in Viera, Fla. (AP Photo/David J. Phillip)

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Washington Nationals pitcher Gio Gonzalez adjusts his jersey during a spring training baseball workout Thursday, Feb. 14, 2013, in Viera, Fla. (AP Photo/David J. Phillip)