Washington Nationals infielder Ryan Zimmerman walks to third base for the start of the ninth inning of an exhibition spring training baseball game against the Atlanta Braves on Wednesday, March 27, 2013, in Viera, Fla. (AP Photo/Evan Vucci)
Washington Nationals infielder Ryan Zimmerman sits in the dugout before the start of an exhibition spring training baseball game against the Atlanta Braves on Sunday, March 24, 2013, in Viera, Fla. (AP Photo/Evan Vucci)
A shoulder injury prompted Nationals third baseman Ryan Zimmerman to take four cortisone shots to get through last season and undergo offseason surgery. (Andrew Harnik/The Washington Times)
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)
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 third baseman Ryan Zimmerman (11) talks with teammates in the dugout as the Washington Nationals play the Florida Marlins during spring training at Space Coast Stadium, Viera, Fla., Wednesday, February 27, 2013. (Andrew Harnik/The Washington Times)
Washington Nationals third baseman Ryan Zimmerman (11) laughs at a morning practice during spring training at Space Coast Stadium, Viera, Fla., Tuesday, February 26, 2013. (Andrew Harnik/The Washington Times)
Washington Nationals third baseman Ryan Zimmerman (11) warms up at a morning practice during spring training at Space Coast Stadium, Viera, Fla., Tuesday, February 26, 2013. (Andrew Harnik/The Washington Times)
Washington Nationals third baseman Ryan Zimmerman (11) warms up at a morning practice during spring training at Space Coast Stadium, Viera, Fla., Tuesday, February 26, 2013. (Andrew Harnik/The Washington Times)
This is a 2013 photo of Ryan Zimmerman of the Washington Nationals baseball team. This image reflects the Nationals active roster as of Feb. 20, 2013 when this image was taken.(AP Photo/Phelan M. Ebenhack)
Washington Nationals' Bryce Harper (34) and Ryan Zimmerman (11) run the bases during spring training baseball in Viera, Fla., Wednesday, Feb. 20, 2013.(AP Photo/Phelan M. Ebenhack)
Washington Nationals third baseman Ryan Zimmerman, right, talks with outfielder Bryce Harper during a spring training baseball workout Tuesday, Feb. 19, 2013, in Viera, Fla. (AP Photo/David J. Phillip)
Washington Nationals third baseman Ryan Zimmerman fields a ground ball during a spring training baseball workout Tuesday, Feb. 19, 2013, in Viera, Fla. (AP Photo/David J. Phillip)
Washington Nationals, from left to right, Jayson Werth, Bryce Harper, Danny Espinosa and Ryan Zimmerman stretch during a spring training baseball workout Tuesday, Feb. 19, 2013, in Viera, Fla. (AP Photo/David J. Phillip)
Washington Nationals third baseman Ryan Zimmerman stretches during a spring training baseball workout Tuesday, Feb. 19, 2013, in Viera, Fla. (AP Photo/David J. Phillip)