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, 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/Mike Groll
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, Sept. 10, 2012, in New York. Murray won 7-6 (10), 7-5, 2-6, 3-6, 6-2.
AP Photo/Charles Krupa
Britain's Andy Murray reacts after beating Serbia's Novak Djokovic in the championship match at the 2012 US Open tennis tournament, Sept. 10, 2012, in New York.
AP Photo/Mike Groll
Serbia's Novak Djokovic returns a shot to Britain's Andy Murray during the championship match at the 2012 US Open tennis tournament, Sept. 10, 2012, in New York.
AP Photo/Julio Cortez
Britain's Andy Murray, right, returns a shot to Serbia's Novak Djokovic during the championship match at the 2012 US Open tennis tournament, Sept. 10, 2012, in New York.
AP Photo/Darron Cummings
Britain's Andy Murray reacts while playing against Serbia's Novak Djokovic during the championship match at the 2012 US Open tennis tournament, Sept. 10, 2012, in New York.
AP Photo/Mike Groll
Serena Williams holds the championship trophy after beating Victoria Azarenka, of Belarus, in the championship match at the 2012 US Open tennis tournament, 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 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, Sept. 9, 2012, in New York.
AP Photo/Julio Cortez
Tennis fans watch Serena Williams play Victoria Azarenka, of Belarus, during the championship match at the 2012 US Open tennis tournament, Sept. 9, 2012, in New York.
AP Photo/Kathy Willens
Victoria Azarenka, of Belarus, returns a shot to Serena Williams during the championship match at the 2012 US Open tennis tournament, Sept. 9, 2012, in New York.
AP Photo/Julio Cortez
A woman struggles with her umbrella as tennis fans take shelter during a rain delay during at the 2012 US Open tennis tournament, Sept. 8, 2012, in New York.
AP Photo/Mike Groll
Novak Djokovic of Serbia reacts after beating Spain's David Ferrer during a semifinal match at the 2012 US Open tennis tournament, Sept. 9, 2012, in New York.
AP Photo/Kathy Willens
Spain's David Ferrer returns a shot to Serbia's Novak Djokovic during a semifinal match at the 2012 US Open tennis tournament, Sept. 9, 2012, in New York. Ferrer lost the match.
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, Sept. 9, 2012, in New York.
AP Photo/Mike Groll
Britain's Andy Murray reacts after beating Czech Republic's Tomas Berdych in a semifinal match at the 2012 US Open tennis tournament, Sept. 8, 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, 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, Sept. 7, 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, Sept. 7, 2012, in New York.
Al Bello/Getty Images
Novak Djokovic of Serbia celebrates match point during his men's singles quarterfinal match against Juan Martin Del Potro of Argentina at the 2012 US Open at USTA Billie Jean King National Tennis Center, Sept. 6, 2012, in New York.
Djokovic defeated Del Potro 6-2, 7-6 (3), 6-4, putting the Serb in his 10th consecutive Grand Slam semifinal.
AP Photo/Darron Cummings
Novak Djokovic, of Serbia, reacts after winning the second set against Juan Martin del Potro, of Argentina, in a quarterfinal at the U.S. Open tennis tournament, 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, Sept. 6, 2012, in New York.
Getty Images/Emmanuel Dunand
Serbia's Novak Djokovic plays a point against Argentina's Juan Martin Del Potro during their 2012 US Open men's singles quarterfinals match at the USTA Billie Jean King National Tennis Center in New York, Sept. 6, 2012, in New York.
AP Photo/Julio Cortez
David Ferrer of Spain reacts after defeating Janko Tipsarevic in five sets in the quarterfinals during the 2012 US Open tennis tournament, Sept. 6, 2012, in New York.
Janko Tipsarevic
David Ferrer of Spain reacts after defeating Janko Tipsarevic in five sets in the quarterfinals during the 2012 US Open tennis tournament, 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, Sept. 6, 2012, in New York.
AP Photo/Darron Cummings
Spain's David Ferrer returns a shot against Janko Tipsarevic of Serbia in the quarterfinals during the 2012 US Open tennis tournament, Sept. 6, 2012, in New York.
AP Photo/Charles Krupa
Tomas Berdych, of the Czech Republic, raises his arms after beating Roger Federer, of Switzerland, 7-6 (1), 6-4, 3-6, 6-3 in a quarterfinal of the U.S. Open tennis tournament, Sept. 5, 2012, in New York.
AP Photo/Charles Krupa
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, Sept. 5, 2012. in New York. Berdych won 7-6 (1), 6-4, 3-6, 6-3.
AP Photo/Charles Krupa
Roger Federer, of Switzerland, wipes his brow late in the fourth set during his loss to Tomas Berdych, of the Czech Republic, in the quarterfinal round of play at the U.S. Open tennis tournament, Sept. 5, 2012, in New York. Berdych won 7-6 (1), 6-4, 3-6, 6-3.
AP Photo/Charles Krupa
Roger Federer, of Switzerland, tosses the ball on his serve to Tomas Berdych, of the Czech Republic, in the quarterfinal round of play at the U.S. Open tennis tournament, Sept. 5, 2012, in New York.
AP Photo/Darron Cummings
Maria Sharapova, of Russia, serves to Marion Bartoli, of France, in the quarterfinals during the 2012 US Open tennis tournament, Sept. 5, 2012, in New York.
AP Photo/Darron Cummings
Serena Williams chases down a shot from Ana Ivanovic, of Serbia, during a quarterfinal at the U.S. Open tennis tournament, Sept. 5, 2012, in New York.
AP Photo/Henny Ray Abrams
Andy Murray of Great Britain jogs off the court during a break between sets while playing Marin Cilic of Croatia in the quarterfinals of the 2012 US Open tennis tournament, Sept. 5, 2012, in New York.
AP Photo/Henny Ray Abrams
Andy Murray of Great Britain throws down his racket while playing Marin Cilic of Croatia in the quarterfinals of the 2012 US Open tennis tournament, Sept. 5, 2012, in New York.
AP Photo/Darron Cummings
Andy Roddick drops his racket during his match against Argentina's Juan Martin Del Potro in the quarterfinals during the 2012 US Open tennis tournament, Sept. 5, 2012, in New York.
AP Photo/Charles Krupa
Andy Roddick reacts during his match with Argentina's Juan Martin Del Potro in the quarterfinals of the 2012 US Open tennis tournament, Sept. 5, 2012, in New York.
AP Photo/Charles Krupa
Andy Roddick watches the ball during his match with Argentina's Juan Martin Del Potro in the fourth round of play at the 2012 US Open tennis tournament, Sept. 5, 2012, in New York.
AP Photo/Darron Cummings
Andy Roddick walks onto the court during his match with Argentina's Juan Martin Del Potro in the quarterfinals during the 2012 US Open tennis tournament, Sept. 5, 2012, in New York.
AP Photo/Mike Groll
Victoria Azarenka, of Belarus, reacts after winning her match against Samantha Stosur, of Australia, in the quarterfinals of the 2012 US Open tennis tournament, Sept. 4, 2012, in New York.
AP Photo/Kathy Willens
Victoria Azarenka, of Belarus, returns a shot to Samantha Stosur, of Australia, in the quarterfinals of the 2012 US Open tennis tournament, Sept. 4, 2012, in New York.
AP Photo/Charles Krupa
Andy Roddick returns a shot to Argentina's Juan Martin Del Potro in the fourth round of the 2012 US Open tennis tournament, Sept. 4, 2012, in New York.
AP Photo/Darron Cummings
Argentina's Juan Martin Del Potro returns a shot to Andy Roddick in the fourth round of play at the 2012 US Open tennis tournament, Sept. 4, 2012, in New York.
AP Photo/Kathy Willens
Maria Sharapova, of Russia, reacts before resuming her match against Marion Bartoli, of France, in the quarterfinals of the 2012 US Open tennis tournament, Sept. 4, 2012, in New York.
AP Photo/Kathy Willens
Slovakia's Martin Klizan reacts during his match against Marin Cilic, of Croatia, in the fourth round of play at the 2012 US Open tennis tournament, Sept. 3, 2012, in New York. Klizan lost the match.
AP Photo/Henny Ray Abrams
Czech Republic's Tomas Berdych returns a shot to Spain's Nicolas Almagro in the fourth round of play at the 2012 US Open tennis tournament, Sept. 3, 2012, in New York.
AP Photo/Kathy Willens
Serbia's Ana Ivanovic reacts during her match against Bulgaria's Tsvetana Pironkova in the fourth round of play at the 2012 US Open tennis tournament, Sept. 3, 2012, in New York.
AP Photo/Julio Cortez
Serena Williams returns a shot to Czech Republic's Andrea Hlavackova in the fourth round of play at the 2012 US Open tennis tournament, Sept. 3, 2012, in New York.
AP Photo/Paul Bereswill
Argentina's Leonardo Mayer returns a shot to Argentina's Juan Martin Del Potro in the third round of play at the 2012 US Open tennis tournament, Sept. 2, 2012, in New York.
AP Photo/Charles Krupa
Maria Sharapova, of Russia, hits a ball into the crowd after defeating Nadia Petrova, of Russia, 6-1, 4-6, 6-4 in the fourth round of play at the U.S. Open tennis tournament, Sept. 2, 2012, in New York.
AP Photo/Kathy Willens
Samantha Stosur, of Australia, returns a shot to Britain's Laura Robson in the third round of play at the 2012 US Open tennis tournament, Sept. 2, 2012, in New York.
AP Photo/Mel C. Evans
Samantha Stosur, of Australia, serves to Britain's Laura Robson in the third round of play at the 2012 US Open tennis tournament, Sept. 2, 2012, in New York. Stosur won the match.
AP Photo/Mike Groll
Andy Roddick reacts during his match against Italy's Fabio Fognini in the third round of play at the 2012 US Open tennis tournament, Sept. 2, 2012, in New York.
AP Photo/Mike Groll
Andy Roddick gestures during his match with Fabio Fogniniin the third round of play at the 2012 US Open tennis tournament, Sept. 2, 2012, in New York.
AP Photo/Julio Cortez
Czech Republic's Andrea Hlavackova returns a shot to Serena Williams in the fourth round of play at the 2012 US Open tennis tournament, Sept. 3, 2012, in New York. Williams won the match.
AP Photo/Paul Bereswill
Steve Johnson returns a shot to Richard Gasquet, of France, in the fourth round of play at the 2012 US Open tennis tournament, Sept. 2, 2012, in New York.
Al Bello/Getty Images
Serena Williams of the United States returns a shot against Andrea Hlavackova of Czech Republic during their women's singles fourth round match on Day Eight of the 2012 U.S. Open at USTA Billie Jean King National Tennis Center on September 3, 2012 in the Flushing neighborhood of the Queens borough of New York City.
Getty Images/Timmy Clary
Serena Williams of the U.S. hits against Andrea Hlavackova of the Czech Republic during their U.S. Open women's singles match, at the USTA Billie Jean King National Tennis Center in New York, September 3, 2012. The three-time U.S. Open champion defeated Hlavackova 6-0, 6-0.
Cameron Spencer/Getty Images
Andy Roddick of the United States celebrates match point during his men's singles third round match against Fabio Fognini of Italy on Day Seven of the 2012 U.S. Open at USTA Billie Jean King National Tennis Center on September 2, 2012 in the Flushing neighborhood of the Queens borough of New York City.
AP Photo/Paul Bereswill
Jo-Wilfried Tsonga of France jumps over the net during his match against Slovakia's Martin Klizan in the second round of play at the 2012 U.S. Open tennis tournament, Thursday, Aug. 30, 2012, in New York. Fifth-seeded Tsonga was upset by Klizan in the second round.
AP Photo/Darron Cummings
Roger Federer, of Switzerland, returns a shot to Bjorn Phau, of Germany, during a match at the U.S. Open tennis tournament, Aug. 30, 2012, in New York.
AP Photo/Mike Groll
Serbia's Ana Ivanovic reacts during her match against Sweden's Sofia Arvidsson in the second round of play at the 2012 US Open tennis tournament, Aug. 30, 2012, in New York.
AP Photo/Charles Krupa
Venus Williams keeps her eyes on the ball as she returns to Angelique Kerber, of Germany, in the second round of play at the U.S. Open tennis tournament, Aug. 30, 2012, in New York.
AP Photo/Charles Krupa
James Blake celebrates during his match against Marcel Granollers, of Spain, in the second round of play at the U.S. Open tennis tournament, Aug. 30, 2012, in New York. Blake won 6-1, 6-4, 6-2.
AP Photo/Darron Cummings
Serena Williams looks into the stands during her match against Spain's Maria Jose Martinez Sanchez in the second round of play at the 2012 US Open tennis tournament, Aug. 30, 2012, in New York.
AP Photo/Darron Cummings
In this photograph made with a slow shutter speed, Serena Williams returns a shot to Spain's Maria Jose Martinez Sanchez in the second round of play at the 2012 US Open tennis tournament, Aug. 30, 2012, in New York.
AP Photo/Charles Krupa
Sara Errani, of Italy, serves to Vera Dushevina in the second round of play at the U.S. Open tennis tournament, Aug. 30, 2012, in New York.
AP Photo/Kathy Willens
Serbia's Jelena Jankovic returns a shot to Spain's Lara Arruabarrena-Vecino in the second round of play at the 2012 US Open tennis tournament, Aug. 30, 2012, in New York.
AP Photo/Mel C. Evans
Spain's Carla Suarez Navarro serves to Agnieszka Radwanska, of Poland, in the second round of play at the 2012 US Open tennis tournament, Aug. 30, 2012, in New York.
AP Photo/Charles Krupa
Laura Robson of Great Britain reacts after beating Kim Clijsters of Belgium in the second round of play at the 2012 US Open tennis tournament, Aug. 29, 2012, in New York.
AP Photo/Mel C. Evans
Kim Clijsters of Belgium sits on the side of the court after losing to Laura Robson of Great Britain in the second round of play at the 2012 US Open tennis tournament, Aug. 29, 2012, in New York.
AP Photo/Charles Krupa
Kim Clijsters of Belgium looks up after losing to Laura Robson of Great Britain in the second round of play at the 2012 US Open tennis tournament, Aug. 29, 2012, in New York.
AP Photo/Charles Krupa
Andy Murray, of Britain, celebrates his 6-2, 6-1, 6-3, win over Ivan Dodig, of Croatia, in the second round of play at the U.S. Open tennis tournament, Aug. 29, 2012, in New York.
AP Photo/Darron Cummings
Maria Sharapova, of Russia, serves to Lourdes Dominguez Lino, of Spain, during a match at the U.S. Open tennis tournament, Aug. 29, 2012, in New York.
AP Photo/Darron Cummings
Maria Sharapova, of Russia, returns a shot to Lourdes Dominguez Lino, of Spain, during a match at the U.S. Open tennis tournament, Aug. 29, 2012, in New York.
AP Photo/Darron Cummings
Kim Clijsters of Belgium returns a shot to Laura Robson of Great Britain in the second round of play at the 2012 US Open tennis tournament, Aug. 29, 2012, in New York.
AP Photo/Mel C. Evans
Kim Clijsters of Belgium returns a shot against Laura Robson of Great Britain in the second round of play at the 2012 US Open tennis tournament, Aug. 29, 2012, in New York.
AP Photo/Paul Bereswill
Li Na of China reaches for the ball during her match against Casey Dellacqua of Australia in the second round of play at the 2012 US Open tennis tournament, Aug. 29, 2012, in New York.
AP Photo/Mike Groll
David Ferrer of Spain, reaches for the ball during his match against Kevin Anderson of South Africa, in the second round of play at the 2012 US Open tennis tournament, Aug. 29, 2012, in New York.
AP Photo/Mike Groll
Juan Monaco of Argentina serves to Spain's Guillermo Garcia-Lopez in the first round of play at the 2012 US Open tennis tournament, Aug. 28, 2012, in New York.
AP Photo/Charles Krupa
Venus Williams returns a shot to Bethanie Mattek-Sands during the first round of play at the 2012 US Open tennis tournament, Aug. 28, 2012, in New York.
AP Photo/Mike Groll
France's Jo-Wilfried Tsonga signs autographs as he leaves the court after winning a match against Slovakia's Karol Beck in the first round of play at the 2012 US Open tennis tournament, Aug. 28, 2012, in New York.
AP Photo/Darron Cummings
Novak Djokovic, of Serbia, eyes a return shot to Paolo Lorenzi, of Italy, during a match at the U.S. Open tennis tournament, Aug. 28, 2012, in New York.
AP Photo/Paul Bereswill
Tomas Berdych serves to David Goffin, of Belgium, in the first round of play at the 2012 US Open tennis tournament, Aug. 28, 2012, in New York.
AP Photo/Darron Cummings
Serena Williams looks up during a match against Coco Vandeweghe at the U.S. Open tennis tournament, Aug. 28, 2012, in New York.
AP Photo/Darron Cummings
Serena Williams returns a shot to Coco Vandeweghe during a match at the U.S. Open tennis tournament, Aug. 28, 2012, in New York.
AP Photo/Mike Groll
Jo-Wilifried Tsongas of France serves to Slovakia's Karol Beck in the first round of play at the 2012 US Open tennis tournament, Aug. 28, 2012, in New York.
AP Photo/Kathy Willens
Andy Roddick returns a shot to Rhyne Williams at the 2012 US Open tennis tournament, Aug. 28, 2012, in New York.
AP Photo/Mike Groll
France's Jo-Wilfried Tsonga celebrates after winning his match against Slovakia's Karol Beck in the first round of play at the 2012 US Open tennis tournament, Aug. 28, 2012, in New York.
AP Photo/Kathy Willens
Andy Roddick returns a shot to Rhyne Williams in the first round of play at the 2012 US Open tennis tournament, Aug. 28, 2012, in New York.
AP Photo/Kathy Willens
Venus Williams holds her racket while playing Bethanie Mattek-Sands in the first round of play at the 2012 US Open tennis tournament, Aug. 28, 2012, in New York.
AP Photo/Charles Krupa
Juan Monaco, of Argentina, kisses his racquet during his match against Guillermo Garcia-Lopez, of Spain, in the first round of play at the U.S. Open tennis tournament, Aug. 28, 2012, in New York. Garcia-Lopez won 3-6, 1-6, 6-4, 7-6 (6), 7-6 (3).
AP Photo/Paul Bereswill
Italy's Francesca Schiavone returns a shot to Sloane Stephens in the first round of play at the 2012 US Open tennis tournament, Aug. 28, 2012, in New York.
AP Photo/Charles Krupa
Roger Federer, of Switzerland, returns against Donald Young in the first round of play at the U.S. Open tennis tournament, Aug. 27, 2012, in New York.
AP Photo/Charles Krupa
Donald Young reacts after losing a point to Roger Federer, of Switzerland, in the first round of play at the U.S. Open tennis tournament, Aug. 27, 2012, in New York.
AP Photo/Charles Krupa
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, Aug. 27, 2012, in New York.
AP Photo/Mike Groll
Andy Murray serves to Alex Bogomolov Jr., of Russia, in the first round of play at the 2012 US Open Tennis tournament, 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, Aug. 27, 2012, in New York. Murray won the match.
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, Aug. 27, 2012, in New York.
AP Photo/Mike Groll
Alex Bogomolov Jr., of Russia, watches a ball hit by Britain's Andy Murray during their match at the 2012 US Open Tennis tournament, Aug. 27, 2012, in New York.
AP Photo/Mel C. Evans
Jamie Hampton hits a ball with the handle of her racket before resuming play against Marion Bartoli, of France, at the 2012 US Open Tennis tournament, Aug. 27, 2012, in New York.
AP Photo/Kathy Willens
Lucie Safarova, of the Czech Republic, returns a shot to Melanie Oudin in the first round of play at the 2012 US Open tennis tournament, Aug. 27, 2012, in New York.