DeeDee Trotter of the U.S. starts in her women's 400m semi-finals at the London 2012 Olympic Games at...
DeeDee Trotter of the U.S. starts in her women's 400m semi-finals at the London 2012 Olympic Games at the Olympic Stadium August 4, 2012. REUTERS/Lucy Nicholson (BRITAIN - Tags: SPORT ATHLETICS OLYMPICS)