Jamaican Melanie Walker celebrates after setting an Olympic record to win the Women's 400m Hurdles, emerging victorious over pre-race favorite and rival Sheena Tosta of the United States at the National Stadium in Beijing August 20, 2008. Walker, in her Olympic debut, crossed the line in 52.64 seconds to prove that it is not only the Jamaican men who can set Athletics records. (UPI Photo/Stephen Shaver)