Federer, Djokovic, Williams sisters highlight Open The Associated Press Getty Images

Federer, Djokovic, Williams sisters highlight Open The Associated Press Getty Images
ADVANCE FOR WEEKEND EDITIONS, AUG. 25-26 - FILE - This March 13, 2012 file photo shows Maria Sharapova, of Russia, returning a shot to Roberta Vinci of Italy during their match at the BNP Paribas Open tennis tournament, in Indian Wells, Calif. The men's and women's first round of the U.S. Open tennis tournament begins Monday, Aug. 27, 2012 in New York. (AP Photo/Mark J. Terrill, File)
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