Serena & Venus Williams at the Olympics

Reuters
Serena Williams of the U.S. holds her stomach before retiring from her women's doubles tennis match with Venus Williams of the U.S. against Kristina Barrois of Germany and Stefanie Voegele of Switzerland at the Wimbledon Tennis Championships, in London

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Williams sisters Venus and Serena compete for gold at the All-England Club in London during the Olympics.

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