Olympics Day 9 - Athletics

(Photo by Adam Pretty/Getty Images)

Sanya Richards-Ross of the United States runs alongside Antonina Krivoshapka of Russia in the Women's 400m final on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England. (Photo by Adam Pretty/Getty Images)

Olympics Day 9 - Athletics

(Photo by Adam Pretty/Getty Images)

Sanya Richards-Ross of the United States runs in the Women's 400m final on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England. (Photo by Adam Pretty/Getty Images)

Olympics Day 9 - Athletics

(Photo by Ian Walton/Getty Images)

Amantle Montsho of Botswana, Sanya Richards-Ross of the United States, Antonina Krivoshapka of Russia, DeeDee Trotter of the United States and Rosemarie Whyte of Jamaica compete in the Women's 400m Final on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England. (Photo by Ian Walton/Getty Images)

Olympics Day 9 - Athletics

(Photo by Ian Walton/Getty Images)

Sanya Richards-Ross of the United States crosses the line to win the gold in the Women's 400m Final on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England. (Photo by Ian Walton/Getty Images)

Olympics Day 9 - Athletics

(Photo by Streeter Lecka/Getty Images)

Sanya Richards-Ross of the United States crosses the line to win gold in the Women's 400m Final on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England. (Photo by Streeter Lecka/Getty Images)

Olympics Day 9 - Athletics

(Photo by Jeff J Mitchell/Getty Images)

Sanya Richards-Ross of the United States crosses the finish line to win the Women's 400m final on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England. (Photo by Jeff J Mitchell/Getty Images)

Olympics Day 9 - Athletics

(Photo by Stu Forster/Getty Images)

Sanya Richards-Ross of the United States celebrates winning gold in the Women's 400m Final on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England. (Photo by Stu Forster/Getty Images)

Olympics Day 9 - Athletics

(Photo by Streeter Lecka/Getty Images)

Sanya Richards-Ross of the United States celebrates winning gold in the Women's 400m Final with the crowd on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England. (Photo by Streeter Lecka/Getty Images)

Olympics Day 9 - Athletics

(Photo by Jamie Squire/Getty Images)

Gold medalist Sanya Richards-Ross (L) of the United States celebrates with bronze medalist DeeDee Trotter of the United States in the Women's 400m Final on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England. (Photo by Jamie Squire/Getty Images)

Olympics Day 9 - Athletics

(Photo by Jamie Squire/Getty Images)

Sanya Richards-Ross of the United States wins the gold in the Women's 400m Final on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England. (Photo by Jamie Squire/Getty Images)

Olympics Day 9 - Athletics

(Photo by Streeter Lecka/Getty Images)

Sanya Richards-Ross of the United States wins the gold in the Women's 400m Final on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England. (Photo by Streeter Lecka/Getty Images)

Olympics Day 9 - Athletics

(Photo by Mike Hewitt/Getty Images)

Sanya Richards-Ross of the United States celebrates after winning the gold medal in the Women's 400m final on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England. (Photo by Mike Hewitt/Getty Images)