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Novak Djokovic of Serbia celebrates defeating Tomas Berdych of Czech Republic in their men's singles quarter-final match at the Australian Open tennis tournament in Melbourne January 22, 2013.POOL/Reuters

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Novak Djokovic of Serbia stretches for the ball in his men's singles quarter-final match against Tomas Berdych of Czech Republic at the Australian Open tennis tournament in Melbourne January 22, 2013.POOL/Reuters

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Novak Djokovic of Serbia signs autographs for fans after defeating Tomas Berdych of Czech Republic in their men's singles quarter-final match at the Australian Open tennis tournament in Melbourne January 22, 2013.DANIEL MUNOZ/Reuters

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Tomas Berdych of Czech Republic hits a return to Novak Djokovic of Serbia during their men's singles quarter-final match at the Australian Open tennis tournament in Melbourne January 22, 2013.DANIEL MUNOZ/Reuters

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Tomas Berdych of Czech Republic serves to Novak Djokovic of Serbia during their men's singles quarter-final match at the Australian Open tennis tournament in Melbourne January 22, 2013.TOBY MELVILLE/Reuters

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Tomas Berdych of Czech Republic serves to Novak Djokovic of Serbia during their men's singles quarter-final match at the Australian Open tennis tournament in Melbourne January 22, 2013.DANIEL MUNOZ/Reuters

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Maria Sharapova of Russia holds her towel and racket during a break in play in her women's singles quarter-final match against compatriot Ekaterina Makarova at the Australian Open tennis tournament in Melbourne January 22, 2013.TIM WIMBORNE/Reuters

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Ekaterina Makarova of Russia serves to compatriot Maria Sharapova during their women's singles quarter-final match at the Australian Open tennis tournament in Melbourne January 22, 2013.DAMIR SAGOLJ/Reuters

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Maria Sharapova of Russia hits a return to compatriot Ekaterina Makarova during their women's singles quarter-final match at the Australian Open tennis tournament in Melbourne January 22, 2013.NAVESH CHITRAKAR/Reuters

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Maria Sharapova of Russia serves to compatriot Ekaterina Makarova during their women's singles quarter-final match at the Australian Open tennis tournament in Melbourne January 22, 2013.NAVESH CHITRAKAR/Reuters

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Nicolas Almagro of Spain misses a shot during his men's singles quarter-final match against compatriot David Ferrer at the Australian Open tennis tournament in Melbourne January 22, 2013.DAVID GRAY/Reuters

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Nicolas Almagro of Spain, left, congratulates compatriot David Ferrer after Ferrer won their men's singles quarter-final match at the Australian Open tennis tournament in Melbourne January 22, 2013.DAMIR SAGOLJ/Reuters

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David Ferrer of Spain serves to compatriot Nicolas Almagro during their men's singles quarter-final match at the Australian Open tennis tournament in Melbourne January 22, 2013.TIM WIMBORNE/Reuters

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David Ferrer of Spain bounces the ball during his men's singles quarter-final match against compatriot Nicolas Almagro at the Australian Open tennis tournament in Melbourne January 22, 2013.TIM WIMBORNE/Reuters

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Spain's Nicolas Almagro hits a backhand return to compatriot David Ferrer during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 22, 2013.Dita Alangkara/The Associated Press

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David Ferrer of Spain hits a return to compatriot Nicolas Almagro during their men's singles quarter-final match at the Australian Open tennis tournament in Melbourne January 22, 2013.DAVID GRAY/Reuters

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Britain's Andy Murray hits a return during a practice session at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 22, 2013. Murray plays Jeremy Chardy of France in a quarter-final on Wednesday.Greg Baker/The Associated Press

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Li Na of China hits a return to Agnieszka Radwanska of Poland during their women's singles quarter-final match at the Australian Open tennis tournament in Melbourne January 22, 2013.DAVID GRAY/Reuters

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Agnieszka Radwanska of Poland stretches to hit a return to Li Na of China during their women's singles quarter-final match at the Australian Open tennis tournament in Melbourne January 22, 2013.DAMIR SAGOLJ/Reuters

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