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U.S. tennis players Serena Williams, left, and Venus Williams, right, greet each other before an exhibition tennis match in Lagos, Nigeria, Friday, Nov. 2, 2012. After months of injuries and illnesses, Venus Williams was all smiles as she interrupted a break during an exhibition match with her sister Serena to shake her hips to a Nigerian pop song. (AP Photo/Sunday Alamba)

Associated Press
U.S. tennis players Serena Williams, left, and Venus Williams, right, greet each other before an exhibition tennis match in Lagos, Nigeria, Friday, Nov. 2, 2012. After months of injuries and illnesses, Venus Williams was all smiles as she interrupted a break during an exhibition match with her sister Serena to shake her hips to a Nigerian pop song. (AP Photo/Sunday Alamba)
U.S. tennis players Serena Williams, left, and Venus Williams, right, greet each other before an exhibition tennis match in Lagos, Nigeria, Friday, Nov. 2, 2012. After months of injuries and illnesses, Venus Williams was all smiles as she interrupted a break during an exhibition match with her sister Serena to shake her hips to a Nigerian pop song. (AP Photo/Sunday Alamba)
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