US Open Tennis

Australia's Samantha Stosur hits a forehand shot against Petra Martic of Croatia at the 2012 US Open Tennis tournament, Monday, Aug. 27, 2012, in New York. (AP Photo/Mike Groll)

Australia's Samantha Stosur reacts after defeating Petra Martic of Croatia at the 2012 US Open Tennis tournament, Monday, Aug. 27, 2012, in New York. (AP Photo/Mike Groll)

Britain's Andy Murray returns a shot to Alex Bogomolov Jr., of Russia, at the 2012 U.S. Open tennis tournament, Monday, Aug. 27, 2012, in New York. Murray won the match. (AP Photo/Mike Groll)

Maria Sharapova, of Russia, returns a shot to Melinda Czink, of Hungary, at the 2012 US Open Tennis tournament, Monday, Aug. 27, 2012, in New York. (AP Photo/Mike Groll)

Roger Federer, of Switzerland, serves to Donald Young during a match at the U.S. Open tennis tournament, Monday, Aug. 27, 2012, in New York. Federer won 6-3, 6-2, 6-4. (AP Photo/Darron Cummings)

Kim Clijsters, of Belgium, thanks the crowd after defeating Victoria Duval 6-3, 6-1 in the first round of play at the U.S. Open tennis tournament, Monday, Aug. 27, 2012, in New York. (AP Photo/Charles Krupa)

Victoria Duval returns to Kim Clijsters, of Belgium, in the first round of play at the U.S. Open tennis tournament, Monday, Aug. 27, 2012, in New York. (AP Photo/Charles Krupa)

Kim Clijsters, of Belgium, grimaces as she returns to Victoria Duval in the first round of play at the U.S. Open tennis tournament, Monday, Aug. 27, 2012, in New York. (AP Photo/Charles Krupa)

Victoria Duval, left, congratulates Kim Clijsters, of Belgium, on her 6-3, 6-1 win in the first round of play at the U.S. Open tennis tournament, Monday, Aug. 27, 2012, in New York. (AP Photo/Charles Krupa)

Maria Sharapova, of Russia, rerturns a shot to Melinda Czink, of Hungary, at the 2012 US Open Tennis tournament, Monday, Aug. 27, 2012, in New York. (AP Photo/Mike Groll)

Victoria Azarenka, of Belarus, returns a shot to Alexandra Panova, of Russia, in a match at the U.S. Open tennis tournament, Monday, Aug. 27, 2012, in New York. (AP Photo/Darron Cummings)

Roger Federer, of Switzerland, tosses the ball on his serve against Donald Young in the first round of play during the 2012 US Open tennis tournament, Monday, Aug. 27, 2012, in New York. (AP Photo/Charles Krupa)

Donald Young argues a call during a match against Roger Federer, of Switzerland, in the first round of play at the U.S. Open tennis tournament, Monday, Aug. 27, 2012, in New York. (AP Photo/Charles Krupa)

Children jockey for position as they try to get an autograph from Roger Federer, of Switzerland, after he defeated Donald Young 6-3, 6-2, 6-4 in the first round of play at the U.S. Open tennis tournament, Monday, Aug. 27, 2012, in New York. (AP Photo/Charles Krupa)

Serena Williams returns a shot to Russia's Ekaterina Makarova in the third round of play at the 2012 US Open tennis tournament, Saturday, Sept. 1, 2012, in New York. (AP Photo/Kathy Willens)

Serena Williams reacts during her match against Russia's Ekaterina Makarova in the third round of play at the 2012 US Open tennis tournament, Saturday, Sept. 1, 2012, in New York. (AP Photo/Kathy Willens)

Russia's Ekaterina Makarova returns a shot to Serena Williams in the third round of play at the 2012 US Open tennis tournament, Saturday, Sept. 1, 2012, in New York. (AP Photo/Kathy Willens)

Serena Williams returns a shot to Russia's Ekaterina Makarova in the third round of play at the 2012 US Open tennis tournament, Saturday, Sept. 1, 2012, in New York. (AP Photo/Mike Groll)

Czech Republic's Andrea Hlavackova reacts after winning her match against Russia's Maria Kirilenko in the third round of play at the 2012 US Open tennis tournament, Saturday, Sept. 1, 2012, in New York. (AP Photo/Paul Bereswill)

Agnieszka Radwanska, of Poland, returns a shot to Serbia's Jelena Jankovicin the third round of play at the 2012 US Open tennis tournament, Saturday, Sept. 1, 2012, in New York. (AP Photo/Kathy Willens)

Serbia's Jelena Jankovic returns a shot to Agnieszka Radwanska, of Poland, in the third round of play at the 2012 US Open tennis tournament, Saturday, Sept. 1, 2012, in New York. (AP Photo/Kathy Willens)

Agnieszka Radwanska, of Poland, celebrates after winning her match against Serbia's Jelena Jankovic in the third round of play at the 2012 US Open tennis tournament, Saturday, Sept. 1, 2012, in New York. (AP Photo/Kathy Willens)

Italy's Roberta Vinci celebrates after winning her match against Slovakia's Dominika Cibulkova in the third round of play at the 2012 US Open tennis tournament, Saturday, Sept. 1, 2012, in New York. (AP Photo/Mel C. Evans)

Czech Republic's Andrea Hlavackova serves to Russia's Maria Kirilenko in the third round of play at the 2012 US Open tennis tournament, Saturday, Sept. 1, 2012, in New York. (AP Photo/Paul Bereswill)

Switzerland's Roger Federer and Spain's Fernando Verdasco leave the court after their match in the third round of play at the 2012 US Open tennis tournament, Saturday, Sept. 1, 2012, in New York. Federer won the match. (AP Photo/Mike Groll)

Switzerland's Roger Federer signs autographs after a match with Spain's Fernando Verdasco in the third round of play at the 2012 US Open tennis tournament, Saturday, Sept. 1, 2012, in New York. Federer saved the lone break point he faced Saturday in a 6-3, 6-4, 6-4 victory over No. 25 Verdasco to advance to the fourth round of the U.S. Open. (AP Photo/Kathy Willens)

Britain's Andy Murray returns a shot to Spain's Feliciano Lopez in the third round of play at the 2012 US Open tennis tournament, Saturday, Sept. 1, 2012, in New York. (AP Photo/Mel C. Evans)

Spain's Nicolas Almagro reacts after winning his match against Jack Sock in the third round of play at the 2012 US Open tennis tournament, Saturday, Sept. 1, 2012, in New York. (AP Photo/Paul Bereswill)

Fans of Jack Sock cheer during his match against Spain's Nicolas Almagro in the third round of play at the 2012 US Open tennis tournament, Saturday, Sept. 1, 2012, in New York. (AP Photo/Paul Bereswill)

Mardy Fish returns a shot to Gilles Simon of France in the third round of play at the U.S. Open tennis tournament, Saturday, Sept. 1, 2012, in New York. (AP Photo/Henny Ray Abrams)

Gilles Simon, of France, stretches during a match against Mardy Fish at the U.S. Open tennis tournament Saturday, Sept. 1, 2012 in New York. (AP Photo/Darron Cummings)

Gilles Simon, of France, stretches between sets against Mardy Fish during a match at the U.S. Open tennis tournament Saturday, Sept. 1, 2012 in New York. (AP Photo/Darron Cummings)

Mardy Fish serves to Gilles Simon, of France, during a match at the U.S. Open tennis tournament Saturday, Sept. 1, 2012 in New York. (AP Photo/Darron Cummings)

Novak Djokovic, of Serbia, reacts after winning a point against Juan Martin del Potro, of Argentina, during a quarterfinal of the U.S. Open tennis tournament, Thursday, Sept. 6, 2012, in New York. (AP Photo/Charles Krupa)

Juan Martin del Potro, of Argentina, rests on the net after losing a point during the second set against Novak Djokovic, of Serbia, in the quarterfinal round of play at the U.S. Open tennis tournament, Thursday, Sept. 6, 2012, in New York. (AP Photo/Charles Krupa)

Novak Djokovic, of Serbia, cheers with the crowd during the second set against Juan Martin del Potro, of Argentina, in the quarterfinal round of play at the U.S. Open tennis tournament, Thursday, Sept. 6, 2012, in New York. (AP Photo/Charles Krupa)

RETRANSMISSION FOR ALTERNATE CROP--Spain's David Ferrer has his right foot worked on during a medical timeout while playing Janko Tipsarevic of Serbia in the quarterfinals during the 2012 US Open tennis tournament, Thursday, Sept. 6, 2012, in New York. (AP Photo/Peter Morgan)

Spain's David Ferrer comments between games against Serbia's Janko Tipsarevic in the quarterfinals during the 2012 US Open tennis tournament, Thursday, Sept. 6, 2012, in New York. (AP Photo/Peter Morgan)

Janko Tipsarevic of Serbia lays on the court after slipping while playing Spain's David Ferrer in the quarterfinals during the 2012 US Open tennis tournament, Thursday, Sept. 6, 2012, in New York. (AP Photo/Peter Morgan)

Janko Tipsarevic of Serbia returns a shot to Spain's David Ferrer during the quarterfinals of the 2012 US Open tennis tournament, Thursday, Sept. 6, 2012, in New York. (AP Photo/Peter Morgan)

Janko Tipsarevic of Serbia grabs a ball from his pocket before serving against Spain's David Ferrer during the quarterfinals of the 2012 US Open tennis tournament, Thursday, Sept. 6, 2012, in New York. (AP Photo/Peter Morgan)

Janko Tipsarevic of Serbia reacts after scoring a point against Spain's David Ferrer in the quarterfinals during the 2012 US Open tennis tournament, Thursday, Sept. 6, 2012, in New York. (AP Photo/Julio Cortez)

Spain's David Ferrer returns a shot against Janko Tipsarevic of Serbia in the quarterfinals during the 2012 US Open tennis tournament, Thursday, Sept. 6, 2012, in New York. (AP Photo/Julio Cortez)

Spain's David Ferrer comments to the judge while playing Janko Tipsarevic of Serbia in the quarterfinals during the 2012 US Open tennis tournament, Thursday, Sept. 6, 2012, in New York. (AP Photo/Julio Cortez)

Janko Tipsarevic of Serbia reacts after losing a point to Spain's David Ferrer in the quarterfinals during the 2012 US Open tennis tournament, Thursday, Sept. 6, 2012, in New York. (AP Photo/Julio Cortez)

Spain's David Ferrer reacts while playing Serbia's Janko Tipsarevic in the quarterfinals during the 2012 US Open tennis tournament, Thursday, Sept. 6, 2012, in New York. (AP Photo/Peter Morgan)

Spain's David Ferrer returns a shot against Janko Tipsarevic of Serbia in the quarterfinals during the 2012 US Open tennis tournament, Thursday, Sept. 6, 2012, in New York. (AP Photo/Peter Morgan)

Novak Djokovic, of Serbia, returns to Juan Martin del Potro, of Argentina, in the quarterfinal round of play at the U.S. Open tennis tournament, Thursday, Sept. 6, 2012, in New York. (AP Photo/Charles Krupa)

Juan Martin del Potro, of Argentina, walks with a towel over his head after losing a point in the second game against Novak Djokovic, of Serbia, in the quarterfinal round of play at the U.S. Open tennis tournament, Thursday, Sept. 6, 2012, in New York. (AP Photo/Charles Krupa)

Novak Djokovic, of Serbia, returns a shot to Juan Martin del Potro, of Argentina, during a quarterfinal at the U.S. Open tennis tournament Thursday, Sept. 6, 2012, in New York. (AP Photo/Darron Cummings)

Juan Martin del Potro, of Argentina, stretches for a return to Novak Djokovic, of Serbia, during a quarterfinal at the U.S. Open tennis tournament, Thursday, Sept. 6, 2012, in New York. (AP Photo/Charles Krupa)

Bob, left, and Mike Bryan react while playing Radek Stepanek of the India's Leander Paes and Czech Republic's Radek Stepanek during the men's doubles final of the 2012 US Open tennis tournament, Friday, Sept. 7, 2012, in New York. (AP Photo/Mike Groll)

Bob, left, and Mike Bryan celebrate during their match against India's Leander Paes and Czech Republic's Radek Stepanek during the men's doubles final of the 2012 US Open tennis tournament, Friday, Sept. 7, 2012, in New York. (AP Photo/Mike Groll)

Radek Stepanek, Leander Paes Mike Bryan, Bob Bryan

Mike Bryan, lower left, and Bob Bryan, lower right, miss a shot while playing Leander Paes, top left, and Radek Stepanek look on during the men's doubles final of the 2012 US Open tennis tournament, Friday, Sept. 7, 2012, in New York. (AP Photo/Mike Groll)

Radek Stepanek, of the Czech Republic, right, returns a shot against Mike and Bob Bryan while playing with Leander Paes, of India, watches during the men's doubles final of the 2012 US Open tennis tournament, Friday, Sept. 7, 2012, in New York. (AP Photo/Mike Groll)

Radek Stepanek, of the Czech Republic, left, and Leander Paes, of India, talk while playing Mike and Bob Bryan during the men's doubles final of the 2012 US Open tennis tournament, Friday, Sept. 7, 2012, in New York. (AP Photo/Mike Groll)

Novak Djokovic, of Serbia, reacts after defeating Juan Martin del Potro, of Argentina, in a quarterfinals match at the U.S. Open tennis tournament, Thursday, Sept. 6, 2012, in New York. Djokovic won 6-2, 7-6 (3), 6-4. (AP Photo/Darron Cummings)

Tomas Berdych, of the Czech Republic, raises his arms after defeating Roger Federer, of Switzerland, in the quarterfinal round of play at the U.S. Open tennis tournament, Wednesday, Sept. 5, 2012. in New York. Berdych won 7-6 (1), 6-4, 3-6, 6-3. (AP Photo/Charles Krupa)

Spain's David Ferrer reacts while playing Serbia's Janko Tipsarevic in the quarterfinals during the 2012 US Open tennis tournament, Thursday, Sept. 6, 2012, in New York. (AP Photo/Julio Cortez)

Victoria Azarenka, of Belarus, reacts after winning her match against Maria Sharapova, of Russia, during a semifinal match at the 2012 US Open tennis tournament, Friday, Sept. 7, 2012, in New York. (AP Photo/Darron Cummings)

Maria Sharapova, of Russia, reacts during her match against Victoria Azarenka, of Belarus, during a semifinal match at the 2012 US Open tennis tournament, Friday, Sept. 7, 2012, in New York. (AP Photo/Darron Cummings)

Serena Williams reacts while playing Italy's Sara Errani during a semifinal match at the 2012 US Open tennis tournament, Friday, Sept. 7, 2012, in New York. Williams won the match. (AP Photo/Mike Groll)

Victoria Azarenka, of Belarus, reacts after winning her match against Maria Sharapova, of Russia, during a semifinal match at the 2012 US Open tennis tournament, Friday, Sept. 7, 2012, in New York. (AP Photo/Darron Cummings)

Serena Williams reacts while playing against Italy's Sara Errani during a semifinal match at the 2012 US Open tennis tournament, Friday, Sept. 7, 2012, in New York. (AP Photo/Darron Cummings)

Italy's Sara Errani returns a shot to Serena Williams during a semifinal match at the 2012 US Open tennis tournament, Friday, Sept. 7, 2012, in New York. (AP Photo/Charles Krupa)

Victoria Azarenka, of Belarus, returns a shot to Maria Sharapova, of Russia, during a semifinal match at the 2012 US Open tennis tournament, Friday, Sept. 7, 2012, in New York. (AP Photo/Mike Groll)

Maria Sharapova, of Russia, returns a shot to Victoria Azarenka, of Belarus,during a semifinal match at the 2012 US Open tennis tournament, Friday, Sept. 7, 2012, in New York. (AP Photo/Charles Krupa)

Maria Sharapova, of Russia, returns a shot to Victoria Azarenka, of Belarus, during a semifinal match at the 2012 US Open tennis tournament, Friday, Sept. 7, 2012, in New York. (AP Photo/Mike Groll)

Victoria Azarenka, of Belarus, reacts during her match against Maria Sharapova, of Russia, during a semifinal match at the 2012 US Open tennis tournament, Friday, Sept. 7, 2012, in New York. (AP Photo/Mike Groll)

Maria Sharapova, of Russia, serves to Victoria Azarenka, of Belarus, during a semifinal match at the 2012 US Open tennis tournament, Friday, Sept. 7, 2012, in New York. (AP Photo/Darron Cummings)

Maria Sharapova, of Russia, returns a shot to Victoria Azarenka, of Belarus, during a semifinal match at the 2012 US Open tennis tournament, Friday, Sept. 7, 2012, in New York. (AP Photo/Darron Cummings)

Serena Williams returns a shot to Italy's Sara Errani during a semifinal match at the 2012 US Open tennis tournament, Friday, Sept. 7, 2012, in New York. (AP Photo/Darron Cummings)

Italy's Sara Errani wipes her face during a break in her match against Serena Williams during a semifinal match at the 2012 US Open tennis tournament, Friday, Sept. 7, 2012, in New York. (AP Photo/Charles Krupa)

Ball persons return chairs and tennis gear to the sidelines after a gust of wind blew them onto the court during a semifinal match between Britain's Andy Murray and Tomas Berdych, of the Czech Republic, at the 2012 US Open tennis tournament, Saturday, Sept. 8, 2012, in New York. (AP Photo/Darron Cummings)

The umpire, Pascal Maria, watches over a semifinal match between Britain's Andy Murray and Czech Republic's Tomas Berdych as his tie is blown by the wind at the 2012 US Open tennis tournament, Saturday, Sept. 8, 2012, in New York. (AP Photo/Charles Krupa)

Britain's Andy Murray, left, and Czech Republic's Tomas Berdych, right, talk with the umpire about a call during a semifinal match at the 2012 US Open tennis tournament, Saturday, Sept. 8, 2012, in New York. (AP Photo/Darron Cummings)

Britain's Andy Murray reacts while playing against Czech Republic's Tomas Berdych during a semifinal match at the 2012 US Open tennis tournament, Saturday, Sept. 8, 2012, in New York. (AP Photo/Mike Groll)

Britain's Andy Murray reacts while playing against Tomas Berdych, of the Czech Republic, during a semifinal match at the 2012 US Open tennis tournament, Saturday, Sept. 8, 2012, in New York. (AP Photo/Darron Cummings)

Britain's Andy Murray reacts while playing against Czech Republic's Tomas Berdych during a semifinal match at the 2012 US Open tennis tournament, Saturday, Sept. 8, 2012, in New York. (AP Photo/Charles Krupa)

Czech Republic's Tomas Berdych returns a shot to Britain's Andy Murray during a semifinal match at the 2012 US Open tennis tournament, Saturday, Sept. 8, 2012, in New York. (AP Photo/Darron Cummings)

Czech Republic's Tomas Berdych reacts while playing against Britain's Andy Murray during a semifinal match at the 2012 US Open tennis tournament, Saturday, Sept. 8, 2012, in New York. (AP Photo/Charles Krupa)

Czech Republic's Tomas Berdych reacts during his match against Britain's Andy Murray during a semifinal match at the 2012 US Open tennis tournament, Saturday, Sept. 8, 2012, in New York. (AP Photo/Charles Krupa)

Serena Williams returns a shot to Italy's Sara Errani during a semifinal match at the 2012 US Open tennis tournament, Friday, Sept. 7, 2012, in New York. Williams won the match. (AP Photo/Mike Groll)

Serena Williams reacts while playing Italy's Sara Errani during a semifinal match at the 2012 US Open tennis tournament, Friday, Sept. 7, 2012, in New York. (AP Photo/Charles Krupa)

Victoria Azarenka, of Belarus, dances while celebrating her win against Maria Sharapova, of Russia, during a semifinal match at the 2012 US Open tennis tournament, Friday, Sept. 7, 2012, in New York. (AP Photo/Mike Groll)

Victoria Azarenka, of Belarus, reacts after winning her match against Maria Sharapova, of Russia, during a semifinal match at the 2012 US Open tennis tournament, Friday, Sept. 7, 2012, in New York. (AP Photo/Mike Groll)

Spain's David Ferrer, second from left, and Serbia's Novak Djokovic, far right, talk with officials during a semifinal match at the 2012 US Open tennis tournament, Saturday, Sept. 8, 2012, in New York. The match was suspended in the first set because of approaching inclement weather. (AP Photo/Mike Groll)

Spain's David Ferrer comments as he packs up his gear after a semifinal match against Novak Djokovic, of Serbia, was postponed because of approaching inclement weather at the 2012 US Open tennis tournament, Saturday, Sept. 8, 2012, in New York. (AP Photo/Charles Krupa)

Serbia's Novak Djokovic walks off the court after the semifinal match against Spain's David Ferrer was postponed because of approaching inclement weather at the 2012 US Open tennis tournament, Saturday, Sept. 8, 2012, in New York. (AP Photo/Mike Groll)

Serbia's Novak Djokovic returns a shot to Spain's David Ferrer during a semifinal match at the 2012 US Open tennis tournament, Saturday, Sept. 8, 2012, in New York. The U.S. Open will finish on a Monday for the fifth consecutive year. With a potentially dangerous storm expected Saturday night in Flushing Meadows, the tournament suspended play for the day while David Ferrer was leading Novak Djokovic 5-2 in the first set of their semifinal. (AP Photo/Darron Cummings)

Spain's David Ferrer reacts while playing Serbia's Novak Djokovic during a semifinal match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. (AP Photo/Mike Groll)

Serbia' Novak Djokovic returns a shot to Spain's David Ferrer during a semifinal match at the 2012 US Open tennis tournament, Saturday, Sept. 8, 2012, in New York. The U.S. Open will finish on a Monday for the fifth consecutive year. With a potentially dangerous storm expected Saturday night in Flushing Meadows, the tournament suspended play for the day while David Ferrer was leading Novak Djokovic 5-2 in the first set of their semifinal. (AP Photo/Charles Krupa)

Serbia's Novak Djokovic reacts during his match against Spain's David Ferrer during a semifinal match at the 2012 US Open tennis tournament, Saturday, Sept. 8, 2012, in New York. The U.S. Open will finish on a Monday for the fifth consecutive year. With a potentially dangerous storm expected Saturday night in Flushing Meadows, the tournament suspended play for the day while David Ferrer was leading Novak Djokovic 5-2 in the first set of their semifinal. (AP Photo/Darron Cummings)

Spain's David Ferrer wipes his face with a towel while playing Serbia's Novak Djokovic during a semifinal match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. (AP Photo/Charles Krupa)

Spain's David Ferrer returns a shot to Serbia's Novak Djokovic during a semifinal match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. (AP Photo/Kathy Willens)

Serbia's Novak Djokovic gestures while playing Spain's David Ferrer during a semifinal match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. (AP Photo/Kathy Willens)

Novak Djokovic of Serbia reacts while playing Spain's David Ferrer during a semifinal match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. (AP Photo/Mike Groll)

Serbia's Novak Djokovic falls while attempting to return a shot to Spain's David Ferrer during a semifinal match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. (AP Photo/Kathy Willens)

Novak Djokovic of Serbia reacts after beating Spain's David Ferrer during a semifinal match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. (AP Photo/Mike Groll)

Spain's David Ferrer returns a shot to Serbia's Novak Djokovic during a semifinal match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. Ferrer lost the match. (AP Photo/Kathy Willens)

Serena Williams reacts after beating Victoria Azarenka, of Belarus, in the championship match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. (AP Photo/Charles Krupa)

Serena Williams reacts after beating Victoria Azarenka, of Belarus, in the championship match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. (AP Photo/Mike Groll)

Serena Williams reacts after beating Victoria Azarenka, of Belarus, in the championship match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. (AP Photo/Darron Cummings)

Serena Williams reacts after beating Victoria Azarenka, of Belarus, in the championship match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. (AP Photo/Mike Groll)

Victoria Azarenka, of Belarus, reacts while playing against Serena Williams during the championship match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. (AP Photo/Darron Cummings)

Serena Williams returns a shot to Victoria Azarenka, of Belarus, during the championship match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. (AP Photo/Charles Krupa)

Victoria Azarenka, of Belarus, reacts while playing against Serena Williams during the championship match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. (AP Photo/Darron Cummings)

Serena Williams reacts while playing Victoria Azarenka, of Belarus, during the championship match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. (AP Photo/Mike Groll)

Serena Williams returns a shot to Victoria Azarenka, of Belarus, during the championship match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. (AP Photo/Mike Groll)

Serena Williams reacts while playing Victoria Azarenka, of Belarus, during the championship match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. (AP Photo/Mike Groll)

Serena Williams returns a shot to Victoria Azarenka, of Belarus, during the championship match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. (AP Photo/Charles Krupa)

Serena Williams reacts while playing against Victoria Azarenka, of Belarus, during the championship match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. (AP Photo/Darron Cummings)

Victoria Azarenka, of Belarus, returns a shot to Serena Williams during the championship match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. (AP Photo/Kathy Willens)

Victoria Azarenka of Belarus, right, argues with the chair umpire during the championship match against Serena Williams at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. (AP Photo/Mike Groll)

Victoria Azarenka, of Belarus, reacts while playing against Serena Williams during the championship match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. (AP Photo/Charles Krupa)

Serena Williams reacts after beating Victoria Azarenka, of Belarus, in the championship match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. Two points from defeat, Williams suddenly regained her composure to come back and win the last four games, beating No. 1-ranked Azarenka 6-2, 2-6, 7-5 on Sunday for her fourth U.S. Open title and 15th Grand Slam title overall. (AP Photo/Mike Groll)

Serena Williams holds up the championship trophy after beating Victoria Azarenka in the championship match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. (AP Photo/Darron Cummings)

Serena Williams reacts after beating Victoria Azarenka, of Belarus, in the championship match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. Two points from defeat, Williams suddenly regained her composure to come back and win the last four games, beating No. 1-ranked Azarenka 6-2, 2-6, 7-5 on Sunday for her fourth U.S. Open title and 15th Grand Slam title overall. (AP Photo/Darron Cummings)

Serena Williams reacts after beating Victoria Azarenka, of Belarus, in the championship match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. (AP Photo/Charles Krupa)

Serena Williams reacts after beating Victoria Azarenka, of Belarus, in the championship match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. Two points from defeat, Williams suddenly regained her composure to come back and win the last four games, beating No. 1-ranked Azarenka 6-2, 2-6, 7-5 on Sunday for her fourth U.S. Open title and 15th Grand Slam title overall. (AP Photo/Mike Groll)

Serena Williams reacts after beating Victoria Azarenka, of Belarus, in the championship match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. Two points from defeat, Williams suddenly regained her composure to come back and win the last four games, beating No. 1-ranked Azarenka 6-2, 2-6, 7-5 on Sunday for her fourth U.S. Open title and 15th Grand Slam title overall. (AP Photo/Darron Cummings)

Serena Williams holds the championship trophy after beating Victoria Azarenka, of Belarus, in the championship match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. Two points from defeat, Williams suddenly regained her composure to come back and win the last four games, beating No. 1-ranked Azarenka 6-2, 2-6, 7-5 on Sunday for her fourth U.S. Open title and 15th Grand Slam title overall. (AP Photo/Kathy Willens)

Britain's Andy Murray reacts after beating Serbia's Novak Djokovic in the championship match at the 2012 US Open tennis tournament, Monday, Sept. 10, 2012, in New York. (AP Photo/Charles Krupa)

Serbia's Novak Djokovic reacts while playing Britain's Andy Murray during the championship match at the 2012 US Open tennis tournament, Monday, Sept. 10, 2012, in New York. (AP Photo/Darron Cummings)

A trainer works on Serbia's Novak Djokovic during his match against Britain's Andy Murray during the championship match at the 2012 US Open tennis tournament, Monday, Sept. 10, 2012, in New York. Djokovic lost the match. (AP Photo/Charles Krupa)

Britain's Andy Murray reacts while playing Serbia's Novak Djokovic during the championship match at the 2012 US Open tennis tournament, Monday, Sept. 10, 2012, in New York. (AP Photo/Mike Groll)

Britain's Andy Murray reacts after beating Serbia's Novak Djokovic in the championship match at the 2012 US Open tennis tournament, Monday, Sept. 10, 2012, in New York. (AP Photo/Charles Krupa)

Britain's Andy Murray poses with the trophy after beating Serbia's Novak Djokovic in the championship match at the 2012 US Open tennis tournament, Monday, Sept. 10, 2012, in New York. (AP Photo/Darron Cummings)

Britain's Andy Murray poses with the trophy after defeating Serbia's Novak Djokovic in the championship match at the U.S. Open tennis tournament, Monday, Sept. 10, 2012, in New York. Murray won 7-6 (10), 7-5, 2-6, 3-6, 6-2. (AP Photo/Mike Groll)

Britain's Andy Murray poses with the trophy after beating Serbia's Novak Djokovic in the championship match at the 2012 US Open tennis tournament, Monday, Sept. 10, 2012, in New York. His considerable lead, and a chance at history, slipping away, Murray dug deep for stamina and mental strength, outlasting Djokovic in a thrilling five-set U.S. Open final. (AP Photo/Charles Krupa)

Britain's Andy Murray poses with the trophy after beating Serbia's Novak Djokovic in the championship match at the 2012 US Open tennis tournament, Monday, Sept. 10, 2012, in New York. Murray vs. Djokovic was a test of will as much as skill, lasting 4 hours, 54 minutes, tying the record for longest U.S. Open final. (AP Photo/Charles Krupa)

Britain's Andy Murray returns a shot to Serbia's Novak Djokovic during the championship match at the 2012 US Open tennis tournament, Monday, Sept. 10, 2012, in New York. (AP Photo/Darron Cummings)

Britain's Andy Murray reacts while playing Serbia's Novak Djokovic during the championship match at the 2012 US Open tennis tournament, Monday, Sept. 10, 2012, in New York. (AP Photo/Charles Krupa)

Britain's Andy Murray reacts while playing Serbia's Novak Djokovic during the championship match at the 2012 US Open tennis tournament, Monday, Sept. 10, 2012, in New York. (AP Photo/Mike Groll)

Britain's Andy Murray reacts after beating Serbia's Novak Djokovic in the championship match at the 2012 US Open tennis tournament, Monday, Sept. 10, 2012, in New York. (AP Photo/Charles Krupa)

Serbia's Novak Djokovic reacts while playing Britain's Andy Murray during the championship match at the 2012 US Open tennis tournament, Monday, Sept. 10, 2012, in New York. (AP Photo/Darron Cummings)

Venus Williams, left, talks with her sister, Serena, during their doubles match against Klaudia Jans-Ignacik, of Poland, and Kristina Mladenovic, of France, in the third round of play at the 2012 US Open tennis tournament, Friday, Aug. 31, 2012, in New York. (AP Photo/Mike Groll)

Venus Williams watches her sister Serena, play Victoria Azarenka, of Belarus, during the championship match at the 2012 US Open tennis tournament, Sunday, Sept. 9, 2012, in New York. (AP Photo/Kathy Willens)

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