Allyson Felix of the U.S. runs with the baton passed by team mate DeeDee Trotter in the women's 4x400m...
Allyson Felix (R) of the U.S. runs with the baton passed by team mate DeeDee Trotter in the women's 4x400m relay final at the London 2012 Olympic Games at the Olympic Stadium August 11, 2012. REUTERS/Lucy Nicholson (BRITAIN - Tags: SPORT ATHLETICS OLYMPICS)
