Tyson Gay, left, beats Justin Gatlin to the finish line in their heat in the senior men's 100-meter dash at the U.S. Championships athletics meet on Friday, June 21, 2013, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)

Photo by: Charlie Neibergall

Tyson Gay, left, beats Justin Gatlin to the finish line in their heat in the senior men's 100-meter dash at the U.S. Championships athletics meet on Friday, June 21, 2013, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)