Washington Nationals outfielders Denard Span, left, and Bryce Harper run to the dugout during the fourth inning of an exhibition spring training baseball game against the Houston Astros on Thursday, March 14, 2013, in Viera, Fla. (AP Photo/Evan Vucci)

Photo by: Evan Vucci

Washington Nationals outfielders Denard Span, left, and Bryce Harper run to the dugout during the fourth inning of an exhibition spring training baseball game against the Houston Astros on Thursday, March 14, 2013, in Viera, Fla. (AP Photo/Evan Vucci)