MASON, OH - AUGUST 19: Roger Federer of Switzerland celebrates with the trophy after defeating Novak Djokovic of Serbia during the final on day nine of the Western & Southern Open at Lindner Family Tennis Center. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 19: Roger Federer of Switzerland celebrates after defeating Novak Djokovic of Serbia during the final on day nine of the Western & Southern Open at Lindner Family Tennis Center. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 19: Li Na of China hits a forehand against Angelique Kerber of Germany during the final on day nine of the Western & Southern Open at Lindner Family Tennis Center on August 19, 2012 (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 19: (R-L) Winner Li Na of China holds her trophy with finalist Angelique Kerber of Germany during the final on day nine of the Western & Southern Open at Lindner Family Tennis Center. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 19: Li Na of China holds the trophy after defeating Angelique Kerber of Germany during the final on day nine of the Western & Southern Open at Lindner Family Tennis Center . (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 17: Roger Federer of Switzerland is congratulated by Mardy Fish after their match during the Western & Southern Open at the Lindner Family Tennis Center on August 17, 2012 in Mason, Ohio. (Photo by Matthew Stockman/Getty Images)

MASON, OH - AUGUST 17: Mardy Fish hits a forehand against Roger Federer of Switzerland during day seven of the Western & Southern Open at Lindner Family Tennis Center on August 17, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 17: Mardy Fish hits a forehand against Roger Federer of Switzerland during day seven of the Western & Southern Open at Lindner Family Tennis Center on August 17, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 17: Li Na of China serves to Agnieszka Radwanska of Poland during the Western & Southern Open at the Lindner Family Tennis Center on August 17, 2012 in Mason, Ohio. (Photo by Matthew Stockman/Getty Images)

MASON, OH - AUGUST 17: Agnieszka Radwanska of Poland serves to Li Na of China during the Western & Southern Open at the Lindner Family Tennis Center on August 17, 2012 in Mason, Ohio. (Photo by Matthew Stockman/Getty Images)

MASON, OH - AUGUST 16: Serena Williams serves against Urszula Radwanska of Poland during day six of the Western & Southern Open at Lindner Family Tennis Center on August 16, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 17: Samantha Stosur of Australia hits a forehand against Venus Williams during day seven of the Western & Southern Open at Lindner Family Tennis Center on August 17, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 17: Venus Williams returns a shot to Samantha Stosur of Australia during the Western & Southern Open at the Lindner Family Tennis Center on August 17, 2012 in Mason, Ohio. (Photo by Matthew Stockman/Getty Images)

MASON, OH - AUGUST 16: Urszula Radwanska of Poland hits a forehand against Serena Williams during day six of the Western & Southern Open at Lindner Family Tennis Center on August 16, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 16: Sloane Stephens plays Agnieszka Radwanska of Poland during the Western & Southern Open at the Lindner Family Tennis Center on August 16, 2012 in Mason, Ohio. (Photo by Matthew Stockman/Getty Images)

MASON, OH - AUGUST 16: Kei Nishikori of Japan serves to Stanislas Wawrinka of Switzerland during the Western & Southern Open at the Lindner Family Tennis Center on August 16, 2012 in Mason, Ohio. (Photo by Matthew Stockman/Getty Images)

MASON, OH - AUGUST 16: Caroline Wozniacki of Denmark hits a backhand against Anastasia Pavlyuchenkova of Russia during day six of the Western & Southern Open at Lindner Family Tennis Center on August 16, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 16: Golfer, Rory McIlroy of Northern Ireland watches on with Piotr Wozniacki during the match between Anastasia Pavlyuchenkova of Russia and Caroline Wozniacki of Denmark during day six of the Western & Southern Open at Lindner Family Tennis Center on August 16, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 16: Daniel Nestor of Canada and Max Mirnyi of Belarus play Andreas Seppi of Italy and Viktor Troicki of Serbia during the Western & Southern Open at the Lindner Family Tennis Center on August 16, 2012 in Mason, Ohio. (Photo by Matthew Stockman/Getty Images)

MASON, OH - AUGUST 17: Marin Cilic of Croatia serves against Novak Djokovic of Serbia during day seven of the Western & Southern Open at Lindner Family Tennis Center on August 17, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 17: Samantha Stosur of Australia serves to Venus Williams during day seven of the Western & Southern Open at Lindner Family Tennis Center on August 17, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 17: Novak Djokovic of Serbia hits a forehand against Marin Cilic of Croatia during day seven of the Western & Southern Open at Lindner Family Tennis Center on August 17, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

Jeremy Chardy of France hits a backhand against Juan Martin Del Potro of Argentina during day seven of the Western & Southern Open at Lindner Family Tennis Center on August 17, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 16: Jeremy Chardy of France celebrates match point against Andy Murray of Great Britain during the Western & Southern Open at the Lindner Family Tennis Center on August 16, 2012 in Mason, Ohio. (Photo by Matthew Stockman/Getty Images)

MASON, OH - AUGUST 16: Andy Murray of Great Britain reacts to losing the first set against Jeremy Chardy of France during the Western & Southern Open at the Lindner Family Tennis Center on August 16, 2012 in Mason, Ohio. (Photo by Matthew Stockman/Getty Images)

MASON, OH - AUGUST 16: Radek Stepanek of the Czech Republic serves against Mardy Fish during day six of the Western & Southern Open at Lindner Family Tennis Center on August 16, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 15: Agnieszka Radwanska of Poland serves against Sofia Arvidsson of Sweden during day five of the Western & Southern Open at Lindner Family Tennis Center on August 15, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 15: Lleyton Hewitt of Australia hits a forehand against Viktor Troicki of Serbia during day five of the Western & Southern Open at Lindner Family Tennis Center on August 15, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 15: Sofia Arvidsson of Sweden hits an overhead volley against Agnieszka Radwanska of Poland during day five of the Western & Southern Open at Lindner Family Tennis Center on August 15, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 15: Novak Djokovic of Serbia shakes hands with Andreas Seppi of Italy after winning during day five of the Western & Southern Open at Lindner Family Tennis Center on August 15, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 15: Andy Murray of Great Britain hits a forehand against Sam Querrey during day five of the Western & Southern Open at Lindner Family Tennis Center on August 15, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 15: Venus Williams hits a forehand against Chanelle Scheepers of South Africa during day five of the Western & Southern Open at Lindner Family Tennis Center on August 15, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 15: James Blake hits a forehand against Kei Nishikori of Japan during day five of the Western & Southern Open at Lindner Family Tennis Center on August 15, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 15: Chanelle Scheepers of South Africa hits a forehand against Venus Williams during day five of the Western & Southern Open at Lindner Family Tennis Center on August 15, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 15: Juan Sebastian Cabal of Columbia confers with Bruno Soares of Brazil between point while playing Colin Fleming and Ross Hutchins of Great Britain during the Western & Southern Open at the Lindner Family Tennis Center on August 15, 2012 in Mason, Ohio. (Photo by Matthew Stockman/Getty Images)

MASON, OH - AUGUST 15: Dominika Cibulkova of Slovakia returns a shot to Andrea Hlavackovaof the Czech Republic during the Western & Southern Open at the Lindner Family Tennis Center on August 15, 2012 in Mason, Ohio. (Photo by Matthew Stockman/Getty Images)

MASON, OH - AUGUST 15: Daniela Hantuchova of Slovakia returns a shot to Sara Errani of Italy during the Western & Southern Open at the Lindner Family Tennis Center on August 15, 2012 in Mason, Ohio. (Photo by Matthew Stockman/Getty Images)

MASON, OH - AUGUST 15: Sara Errani of Italy returns a shot to Daniela Hantuchova of Slovakia during the Western & Southern Open at the Lindner Family Tennis Center on August 15, 2012 in Mason, Ohio. (Photo by Matthew Stockman/Getty Images)

MASON, OH - AUGUST 15: Caroline Wozniacki of Denmark hits a forehand against Sesil Karatantcheva of Kazakhstan during day five of the Western & Southern Open at Lindner Family Tennis Center on August 15, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 15: Sesil Karatantcheva of Kazakhstan hits a forehand against Caroline Wozniacki of Denmark during day five of the Western & Southern Open at Lindner Family Tennis Center on August 15, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 15: Golfer, Rory McIlroy of Northern Ireland watches on during the match between Sesil Karatantcheva of Kazakhstan and Caroline Wozniacki of Denmark during day five of the Western & Southern Open at Lindner Family Tennis Center on August 15, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 15: Sam Querrey lunges for a shot while playing Andy Murray of Great Britain during the Western & Southern Open at the Lindner Family Tennis Center on August 15, 2012 in Mason, Ohio. (Photo by Matthew Stockman/Getty Images)

MASON, OH - AUGUST 15: Ross Hutchins of Great Britain serves to Juan Sebastian Cabal of Columbia and Bruno Soares of Brazil while plaing with Colin Fleming of Great Britain during the Western & Southern Open at the Lindner Family Tennis Center on August 15, 2012 in Mason, Ohio. (Photo by Matthew Stockman/Getty Images)

MASON, OH - AUGUST 15: Alex Bogomolov Jr. of Russia hits a forehand against Roger Federer of Switzerland during day five of the Western & Southern Open at Lindner Family Tennis Center on August 15, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 15: Roger Federer of Switzerland serves against Alex Bogomolov Jr. of Russia during day five of the Western & Southern Open at Lindner Family Tennis Center on August 15, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 15: Alex Bogomolov of Russia congratulates Roger Federer of Switzerland after their match during the Western & Southern Open at the Lindner Family Tennis Center on August 15, 2012 in Mason, Ohio. (Photo by Matthew Stockman/Getty Images)

MASON, OH - AUGUST 15: Roger Federer of Switzerland returns a shot to Alex Bogomolov of Russia during the Western & Southern Open at the Lindner Family Tennis Center on August 15, 2012 in Mason, Ohio. (Photo by Matthew Stockman/Getty Images)

MASON, OH - AUGUST 15: Li Na of China returns a shot to Sorana Cirstea of Romania during the Western & Southern Open at the Lindner Family Tennis Center on August 15, 2012 in Mason, Ohio. (Photo by Matthew Stockman/Getty Images)

MASON, OH - AUGUST 16: Viktor Troicki of Serbia hits a backhand against Juan Martin Del Potro of Argentina during day six of the Western & Southern Open at Lindner Family Tennis Center on August 16, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 16: Radek Stepanek of the Czech Republic serves against Mardy Fish during day six of the Western & Southern Open at Lindner Family Tennis Center on August 16, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 16: Mardy Fish celebrates match point against Radek Stepanek of the Czech Republic during day six of the Western & Southern Open at Lindner Family Tennis Center on August 16, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 14: Andy Roddick hits an overhead volley against Jeremy Chardy of France during day four of the Western & Southern Open at Lindner Family Tennis Center on August 14, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 14: Venus Williams serves to Maria Kirilenko of Russia during day four of the Western & Southern Open at Lindner Family Tennis Center on August 14, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 13: Pablo Andujar of Spain hits a forehand to Marinko Matosevic of Australia during day three of the Western & Southern Open at Lindner Family Tennis Center on August 13, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 13: Marinko Matosevic of Australia hits a forehand against Pablo Andujar of Spain during day three of the Western & Southern Open at Lindner Family Tennis Center on August 13, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 13: Camila Giorgi of Italy hits a backhand against Francesca Schiavone of Italy during day three of the Western & Southern Open at Lindner Family Tennis Center on August 13, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 13: Shuai Peng of China hits a backhand against Jelena Jankovic of Serbia during day three of the Western & Southern Open at Lindner Family Tennis Center on August 13, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 14: Maria Kirilenko of Russia serves to Venus Williams during day four of the Western & Southern Open at Lindner Family Tennis Center on August 14, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 14: Venus Williams hits a backhand against Maria Kirilenko of Russia during day four of the Western & Southern Open at Lindner Family Tennis Center on August 14, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 14: Andy Murray of Great Britain hits a backhand during a practice session on day four of the Western & Southern Open at Lindner Family Tennis Center on August 14, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 14: Jarkko Nieminen of Finland hits a backhand against Alex Bogomolov Jr. of Russia during day four of the Western & Southern Open at Lindner Family Tennis Center on August 14, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 14: Timea Babos of Hungary hits a backhand against Angelique Kerber of Germany during day four of the Western & Southern Open at Lindner Family Tennis Center on August 14, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 14: Andy Murray of Great Britain has his knee looked at by his physiotherapist Andy Ireland during a practice session on day four of the Western & Southern Open at Lindner Family Tennis Center on August 14, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 14: Jeremy Chardy of France hits a forehand against Andy Roddick during day four of the Western & Southern Open at Lindner Family Tennis Center on August 14, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 14: Anabel Medina Garrigues of Spain serves against Samantha Stosur of Australia during day four of the Western & Southern Open at Lindner Family Tennis Center on August 14, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 14: Samantha Stosur of Australia hits a forehand against Anabel Medina Garrigues of Spain during day four of the Western & Southern Open at Lindner Family Tennis Center on August 14, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 14: Mardy Fish serves against Feliciano Lopez of Spain during day four of the Western & Southern Open at Lindner Family Tennis Center on August 14, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 14: Feliciano Lopez of Spain serves against Mardy Fish during day four of the Western & Southern Open at Lindner Family Tennis Center on August 14, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 14: Mardy Fish celebrates winning his match against Feliciano Lopez of Spain during day four of the Western & Southern Open at Lindner Family Tennis Center on August 14, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)

MASON, OH - AUGUST 14: Serena Williams hits a forehand against Eleni Daniilidou of Greece during day four of the Western & Southern Open at Lindner Family Tennis Center on August 14, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)