Lashawn Merritt of USA reacts after to be injured in the 400m men race at the Herculis International Athletics Meeting, at the Louis II Stadium in Monaco, Friday, July 20, 2012. (AP Photo/Lionel Cironneau)

Photo by: Lionel Cironneau

Lashawn Merritt of USA reacts after to be injured in the 400m men race at the Herculis International Athletics Meeting, at the Louis II Stadium in Monaco, Friday, July 20, 2012. (AP Photo/Lionel Cironneau)