Serena Williams, of the United States, returns a shot to Kaia Kanepi, of Estonia, during the fourth round of the 2014 U.S. Open tennis tournament, Monday, Sept. 1, 2014, in New York. (AP Photo/Charles Krupa)
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Serena Williams, of the United States, returns a shot to Kaia Kanepi, of Estonia, during the fourth round of the 2014 U.S. Open tennis tournament, Monday, Sept. 1, 2014, in New York. (AP Photo/Charles Krupa)
