LONDON, ENGLAND - AUGUST 11:  Francena McCorory, Allyson Felix, DeeDee Trotter and Sanya Richards-Ross of the United States celebrate winning gold in the Women's 4 x 400m Relay Final on Day 15 of the London 2012 Olympic Games at Olympic Stadium on August 11, 2012 in London, England.  (Photo by Alexander Hassenstein/Getty Images)