Bryce Harper

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Washington Nationals left fielder Bryce Harper stands in the outfield as fans celebrate the solo home run by Detroit Tigers' Torii Hunter during the second inning of a baseball game in Detroit, Wednesday, July 31, 2013. (AP Photo/Carlos Osorio)

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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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Bryce Harper catches a fly ball in the All-Star Game. (Associated Press photo)

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National League’s Bryce Harper, of the Washington Nationals, stretches during batting practice before the MLB All-Star baseball game, on Tuesday, July 16, 2013, in New York. (AP Photo/Matt Slocum)

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Bryce Harper, left, and his father, Ron, embrace after the Home Run Derby. (Associated Press photo)

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National League's Bryce Harper, of the Washington Nationals, hits a 471 foot, seventh home run, during the MLB All-Star baseball Home Run Derby, on Monday, July 15, 2013 in New York. (AP Photo/Kathy Willens)

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Bryce Harper hit eight home runs in the first round of the Home Run Derby. (Associated Press photo)

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Bryce Harper took batting practice at Citi Field on Monday evening before the Home Run Derby. (Associated Press photo)

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Bryce Harper is ejected by home plate umpire Hunter Wendelstedt in the eighth inning of the Nationals' 2-1 loss to the Marlins on Saturday night. (Associated Press photo)