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Serena Williams reacts after beating Victoria Azarenka of Belarus, in the women's singles final of the 2013 U.S. Open tennis tournament in New York, Sept. 8, 2013.
Credit: Darron Cummings/AP
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Serena Williams reacts after a point against Victoria Azarenka, of Belarus, during the women's singles final.
Credit: Darron Cummings/AP
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Rafael Nadal, of Spain, returns a shot to Richard Gasquet, of France, during the semifinals of the 2013 U.S. Open, Sept. 7, 2013.
Credit: Darron Cummings/AP
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Rafael Nadal, of Spain, serves to Richard Gasquet, of France, during the semifinals of the 2013 U.S. Open, Sept. 7, 2013.
Credit: Charles Krupa/AP
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Novak Djokovic, of Serbia, left and Stanislas Wawrinka, of Switzerland, exchange shots at the net during the semifinals of the 2013 U.S. Open, Sept. 7, 2013.
Credit: Mike Groll/AP
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Novak Djokovic, of Serbia, returns a shot against Stanislas Wawrinka, of Switzerland, during the semifinals of the 2013 U.S. Open, Sept. 7, 2013.
Credit: Mike Groll/AP
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David Ferrer of Spain, right, returns a shot to Richard Gasquet, of France, during the quarterfinals, Sept. 4, 2013.
Credit: Julio Cortez/AP
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David Ferrer, of Spain, lunges as he returns a shot to Richard Gasquet, of France, during the quarterfinals, Sept. 4, 2013.
Credit: Kathy Willens/AP
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David Ferrer, of Spain, returns a shot Richard Gasquet, of France, during the quarterfinals, Sept. 4, 2013.
Credit: Julio Cortez/AP
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David Ferrer, of Spain, reacts after losing a point to Richard Gasquet, of France, during the quarterfinals, Sept. 4, 2013.
Credit: Kathy Willens/AP
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Richard Gasquet, of France, returns a shot to David Ferrer, of Spain, during the quarterfinals, Sept. 4, 2013.
Credit: Kathy Willens/AP
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Roberta Vinci, of Italy, reacts after losing a point to Flavia Pennetta, of Italy, during the quarterfinals, Sept. 4, 2013.
Credit: Kathy Willens/AP
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Mikhail Youzhny, of Russia, returns a shot behind the back to Lleyton Hewitt, of Australia, during the fourth of the 2013 U.S. Open tennis tournament, Sept. 3, 2013, in New York.
Credit: Kathy Willens/AP
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Novak Djokovic, of Serbia, reacts after a point against Marcel Granollers, of Spain, during the fourth round, Sept. 3, 2013.
Credit: David Goldman/AP
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Andy Murray, of Britain, shouts after defeating Denis Istomin, of Uzbekistan, during the fourth round, Sept. 3, 2013.
Credit: Charles Krupa/AP
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Alison Riske returns a shot against Daniela Hantuchova, of Slovakia, during the fourth round of the 2013 U.S. Open tennis tournament, Sept. 2, 2013.
Credit: Mike Groll/AP
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Roger Federer, of Switzerland, returns a shot to Tommy Robredo, of Spain, during the fourth round, Sept. 2, 2013.
Credit: Darron Cummings/AP
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Victoria Azarenka, of Belarus, reacts after scoring a point against Ana Ivanovic, of Serbia, during the quarterfinals, Sept. 3, 2013.
Credit: Julio Cortez/AP
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Andy Murray, of Britain, yells prior to serving on match point against Denis Istomin, of Uzbekistan, during the fourth round, Sept. 3, 2013.
Credit: Charles Krupa/AP
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Novak Djokovic, of Serbia, returns a shot at the net to Marcel Granollers, of Spain, during the fourth round, Sept. 3, 2013.
Credit: Charles Krupa/AP
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Mikhail Youzhny, of Russia, chases down a ball to return to Lleyton Hewitt, of Australia, during the quarterfinals, Sept. 3, 2013.
Credit: Kathy Willens/AP
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Novak Djokovic, of Serbia, returns a shot by Marcel Granollers, of Spain, during the fourth round, Sept. 3, 2013.
Credit: David Goldman/AP
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Novak Djokovic, of Serbia, chases down a shot by Marcel Granollers, of Spain, during the fourth round, Sept. 3, 2013.
Credit: Charles Krupa/AP
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Stanislas Wawrinka, of Switzerland, celebrates after defeating Tomas Berdych, of the Czech Republic, in the fourth round, Sept. 3, 2013.
Credit: David Goldman/AP
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Janko Tipsarevic, of Serbia, reacts to a call during the fourth round against David Ferrer, of Spain, Sept. 2, 2013.
Credit: David Goldman/AP
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Roger Federer, of Switzerland, walks off the court after losing to Tommy Robredo, of Spain, during the fourth round, Sept. 2, 2013.
Credit: Darron Cummings/AP
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Tommy Robredo, of Spain, celebrates after beating Roger Federer, of Switzerland, in straight sets during the fourth round, Sept. 2, 2013.
Credit: David Goldman/AP
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Janko Tipsarevic, of Serbia, returns a shot to David Ferrer, of Spain, during the fourth round, Sept. 2, 2013.
Credit: David Goldman/AP
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Mike Bryan, right, and his twin brother Bob Bryan check their racquets during their match against Colin Fleming and Jonathan Marray, both of Britain, during the men's quarterfinal round, Sept. 2, 2013.
Credit: Charles Krupa/AP
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Tommy Robredo, of Spain, chases down a shot against Roger Federer, of Switzerland, during the fourth round, Sept. 2, 2013.
Credit: Darron Cummings/AP
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Sloane Stephens returns a shot to Serena Williams during the fourth round of the 2013 U.S. Open tennis tournament, Sept. 1, 2013.
Credit: David Goldman/AP
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Sloane Stephens returns a shot to Serena Williams during the fourth round of the 2013 U.S. Open tennis tournament, Sept. 1, 2013.
Credit: Darron Cummings/AP
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Marcos Baghdatis, of Cyprus, reacts during a third round match against Stanislas Wawrinka, of Switzerland, Sept. 1, 2013.
Credit: Mike Groll/AP
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Lleyton Hewitt, of Australia, serves against Evgeny Donskoy, of Russia, during the third round, Sept. 1, 2013.
Credit: Kathy Willens/AP
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Angelique Kerber, of Germany, returns a shot to Carla Suarez Navarro, of Spain, during the fourth round, Sept. 1, 2013.
Credit: Mike Groll/AP
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Andy Murray, of Great Britain, serves to Florian Mayer, of Germany, during the third round, Sept. 1, 2013.
Credit: David Goldman/AP
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Angelique Kerber, of Germany, returns a shot against Carla Suarez Navarro, of Spain, during the fourth round, Sept. 1, 2013.
Credit: Mike Groll/AP
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Serena Williams returns a shot to Sloane Stephens during the fourth round, Sept. 1, 2013.
Credit: Darron Cummings/AP
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Sloane Stephens returns a shot to Serena Williams during the fourth round, Sept. 1, 2013.
Credit: Darron Cummings/AP
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Serena Williams returns a shot to Sloane Stephens during the fourth round, Sept. 1, 2013.
Credit: Charles Krupa/AP
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Lleyton Hewitt, of Australia, returns a shot against Evgeny Donskoy, of Russia, during the third round, Sept. 1, 2013.
Credit: Kathy Willens/AP
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Serena Williams serves to Sloane Stephens during the fourth round of the 2013 U.S. Open tennis tournament, Sept. 1, 2013.
Credit: David Goldman/AP
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Carla Suarez Navarro, of Spain, reacts after beating Angelique Kerber, of Germany, during the fourth round, Sept. 1, 2013.
Credit: Mike Groll/AP
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Julien Benneteau, of France, returns a shot to Tomas Berdych, of the Czech Republic, during the third round, Sept. 1, 2013.
Credit: Kathy Willens/AP
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Serena Williams reacts after a point against Sloane Stephens during the fourth round of the 2013 U.S. Open tennis tournament in New York, Sept. 1, 2013.
Credit: David Goldman/AP