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LONDON, ENGLAND - AUGUST 04: Serena Williams of the United States reacts after defeating Maria Sharapova of Russia to win the gold medal match of the Women's Singles Tennis on Day 8 of the London 2012 Olympic Games at the All England Lawn Tennis and Croquet Club on August 4, 2012 in London, England. (Photo by Elsa/Getty Images)

LONDON, ENGLAND - AUGUST 04:  Serena Williams of the United States reacts after defeating Maria Sharapova of Russia to win the gold medal match of the Women's Singles Tennis on Day 8 of the London 2012 Olympic Games at the All England Lawn Tennis and Croquet Club on August 4, 2012 in London, England.  (Photo by Elsa/Getty Images)