LONDON, ENGLAND - JULY 30:  Xi Zhang of China serves during her Women's Beach Volleyball Preliminary match with Chen Xue of China against Simone Kuhn and Nadine Zumkehr of Switzerland on Day 3 of the London 2012 Olympic Games at Horse Guards Parade on July 30, 2012 in London, England.  (Photo by Ryan Pierse/Getty Images)
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