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)
Washington Nationals' Chad Tracy hits a double against the Houston Astros during the fifth inning an exhibition spring training baseball game Thursday, March 7, 2013, in Kissimmee, Fla. (AP Photo/David J. Phillip)
Texas Rangers' Yu Darvish, right center, is congratulated by teammates as manager Ron Washington heads out to the mound to pull him from the baseball game against the Houston Astros on Tuesday, April 2, 2013, in Houston. Darvish pitched nine and two-thirds perfect innings before giving up a hit to Astros' Marwin Gonzalez in the Rangers' 7-0 win. (AP Photo/Pat Sullivan)
Texas Rangers' Yu Darvish, right center, is congratulated by teammates as manager Ron Washington heads out to the mound to pull him from the baseball game against the Houston Astros on Tuesday, April 2, 2013, in Houston. Darvish pitched eight and two-thirds perfect innings before giving up a hit to Astros' Marwin Gonzalez in the Rangers' 7-0 win. (AP Photo/Pat Sullivan)
Texas Rangers' Yu Darvish delivers a pitch against the Houston Astros in the fifth inning of a baseball game Tuesday, April 2, 2013, in Houston. (AP Photo/Pat Sullivan)
Texas Rangers' Yu Darvish delivers a pitch against the Houston Astros in the fifth inning of a baseball game Tuesday, April 2, 2013, in Houston. (AP Photo/Pat Sullivan)
Washington Nationals pitcher Chris Young delivers a pitch during the first inning of a spring training baseball game against the Houston Astros on Monday, March 25, 2013, in Kissimmee, Fla. (AP Photo/Evan Vucci)
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 Anthony Rendon bats during the first inning of an exhibition spring training baseball game against the Houston Astros on Wednesday, March 13, 2013, in Kissimmee, Fla. (AP Photo/Evan Vucci)
