Washington Nationals' Jayson Werth tosses his bat after striking out against the Houston Astros during the fifth inning of an exhibition spring training baseball game Tuesday, March 5, 2013, in Viera, Fla. (AP Photo/David J. Phillip)
Washington Nationals' Ryan Zimmerman walks back to the dugout after striking out against the Houston Astros during the second inning of an exhibition spring training baseball game Tuesday, March 5, 2013, in Viera, Fla. (AP Photo/David J. Phillip)
Washington Nationals bullpen catcher Octavio Martinez removes an umbrella which blew onto the field during the second inning of an exhibition spring training baseball game against the Houston Astros Tuesday, March 5, 2013, in Viera, Fla. (AP Photo/David J. Phillip)
Houston Astros manager Bo Porter, left, talks with Washington Nationals third baseman Ryan Zimmerman, right, before an exhibition spring training baseball game Tuesday, March 5, 2013, in Viera, Fla. (AP Photo/David J. Phillip)
Washington Nationals manager Davey Johnson, right, talks with Houston Astros manager Bo Porter, left, before an exhibition spring training baseball game Tuesday, March 5, 2013, in Viera, Fla. (AP Photo/David J. Phillip)
Washington Nationals manager Davey Johnson, right, and Houston Astros manager Bo Porter, left, watch batting practice before an exhibition spring training baseball game Tuesday, March 5, 2013, in Viera, Fla. (AP Photo/David J. Phillip)
Washington Nationals' Anthony Rendon, center, is congratulated in the dugout after hitting a home run off St. Louis Cardinals starting pitcher Adam Wainwright during the second inning of an exhibition spring training baseball game, Saturday, March 2, 2013, in Jupiter, Fla. (AP Photo/Julio Cortez)
Washington Nationals' Kurt Suzuki, left, talks to pitcher Gio Gonzalez in the dugout during the second inning of an exhibition spring training baseball game against the St. Louis Cardinals, Saturday, March 2, 2013, in Jupiter, Fla. (AP Photo/Julio Cortez)
Washington Nationals outfielder Eury Perez swings at a pitch from St. Louis Cardinals starting pitcher Adam Wainwright during the second inning of an exhibition spring training baseball game, Saturday, March 2, 2013, in Jupiter, Fla. (AP Photo/Julio Cortez)
Washington Nationals pitcher Gio Gonzalez looks on from the dugout during the second inning of an exhibition spring training baseball game against the St. Louis Cardinals, Saturday, March 2, 2013, in Jupiter, Fla. (AP Photo/Julio Cortez)
A Washington Nationals player's hat and sunglasses sit in the dugout during spring training baseball in Viera, Fla., Wednesday, Feb. 20, 2013.(AP Photo/Phelan M. Ebenhack)
Washington Nationals outfielder Jayson Werth (28) and Bryce Harper, right, wait to take batting practice at spring training baseball in Viera, Fla., Wednesday, Feb. 20, 2013.(AP Photo/Phelan M. Ebenhack)