Washington Nationals starting pitcher Ross Detwiler (48) 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)
Nationals left-hander Ross Detwiler was pulled after three innings on Wednesday when the right side of his back began to spasm and lock up on him. (Associated Press photo)
Washington Nationals starting pitcher Ross Detwiler, right, waits for a new ball as Pittsburgh Pirates' Jody Mercer, rounds the bases after hitting a two-run home run in the fifth inning of a baseball game Friday, May 3, 2013, in Pittsburgh. (AP Photo/Keith Srakocic)
Washington Nationals starting pitcher Ross Detwiler, right, waits for a new ball as Pittsburgh Pirates' Jody Mercer, rounds the bases after hitting a two-run home run in the fifth inning of a baseball game Friday, May 3, 2013, in Pittsburgh. (AP Photo/Keith Srakocic)
Nationals' left-hander Ross Detwiler turned in his third strong start of the season to lead the Nationals to a 6-1 victory over the Marlins, and his 0.90 ERA ranks as the sixth-best mark in the major leagues. (Associated Press photo)
Washington Nationals catcher Kurt Suzuki, left, argues with home plate umpire Greg Gibson that he tagged Miami Marlins' Chris Valaika, not shown, at home during the fifth inning of a baseball game in Miami, Wednesday, April 17, 2013. Nationals pitcher Ross Detwiler reacts at right. (AP Photo/J Pat Carter)
Washington Nationals catcher Kurt Suzuki, left, argues with home plate umpire Greg Gibson that he tagged Miami Marlins' Chris Valaika, not shown, at home during the fifth inning of a baseball game in Miami, Wednesday, April 17, 2013. Nationals pitcher Ross Detwiler reacts at right. (AP Photo/J Pat Carter)
Nationals' left-hander Ross Detwiler turned in his third strong start of the season to lead the Nationals to a 6-1 victory over the Marlins, and his 0.90 ERA ranks as the sixth-best mark in the major leagues. (Associated Press photo)
Nationals' left-hander Ross Detwiler turned in his third strong start of the season to lead the Nationals to a 6-1 victory over the Marlins, and his 0.90 ERA ranks as the sixth-best mark in the major leagues. (Associated Press photo)
