David Ferrer of Spain reacts during his men's singles semi-final match against Novak Djokovic of Serbia at the Australian Open tennis tournament in Melbourne, January 24, 2013.POOL/Reuters
David Ferrer of Spain (R) hits a return to Novak Djokovic of Serbia during their men's singles semi-final match at the Australian Open tennis tournament in Melbourne January 24, 2013.TOBY MELVILLE/Reuters
David Ferrer of Spain hits a return to Novak Djokovic of Serbia during their men's singles semi-final match at the Australian Open tennis tournament in Melbourne January 24, 2013.TOBY MELVILLE/Reuters
Novak Djokovic of Serbia hits a return to David Ferrer of Spain during their men's singles semi-final match at the Australian Open tennis tournament in Melbourne, January 24, 2013.DAVID GRAY/Reuters
David Ferrer of Spain hits a return to Novak Djokovic of Serbia during their men's singles semi-final match at the Australian Open tennis tournament in Melbourne, January 24, 2013.NAVESH CHITRAKAR/Reuters
David Ferrer of Spain hits a return to Novak Djokovic of Serbia during their men's singles semi-final match at the Australian Open tennis tournament in Melbourne, January 24, 2013.TIM WIMBORNE/Reuters
Novak Djokovic of Serbia hits a return to David Ferrer of Spain during their men's singles semi-final match at the Australian Open tennis tournament in Melbourne January 24, 2013.DAVID GRAY/Reuters
Novak Djokovic of Serbia watches the ball during his men's singles semi-final match against David Ferrer of Spain at the Australian Open tennis tournament in Melbourne January 24, 2013.TIM WIMBORNE/Reuters
David Ferrer of Spain hits a return to Novak Djokovic of Serbia during their men's singles semi-final match at the Australian Open tennis tournament in Melbourne January 24, 2013.DAMIR SAGOLJ/Reuters
David Ferrer of Spain hits a return to Novak Djokovic of Serbia during their men's singles semi-final match at the Australian Open tennis tournament in Melbourne January 24, 2013.DAVID GRAY/Reuters
Novak Djokovic of Serbia hits a return to David Ferrer of Spain during their men's singles semi-final match at the Australian Open tennis tournament in Melbourne January 24, 2013.TOBY MELVILLE/Reuters
David Ferrer of Spain serves to Novak Djokovic of Serbia during their men's singles semi-final match at the Australian Open tennis tournament in Melbourne, January 24, 2013.DAVID GRAY/Reuters
Sloane Stephens of the U.S. reacts during her women's singles semi-final match against Victoria Azarenka of Belarus at the Australian Open tennis tournament in Melbourne January 24, 2013.DAVID GRAY/Reuters
LMFAO musician Redfoo, boyfriend of Victoria Azarenka of Belarus, attends her women's singles semi-final match against Sloane Stephens of the U.S. at the Australian Open tennis tournament in Melbourne, January 24, 2013.DAMIR SAGOLJ/Reuters
Victoria Azarenka of Belarus hits a return to Sloane Stephens of the U.S. during their women's singles semi-final match at the Australian Open tennis tournament in Melbourne January 24, 2013.TOBY MELVILLE/Reuters
Victoria Azarenka of Belarus hits a return to Sloane Stephens of the U.S. during their women's singles semi-final match at the Australian Open tennis tournament in Melbourne, January 24, 2013.NAVESH CHITRAKAR/Reuters
Sloane Stephens of the U.S. serves to Victoria Azarenka of Belarus during their women's singles semi-final match at the Australian Open tennis tournament in Melbourne January 24, 2013.TOBY MELVILLE/Reuters
Victoria Azarenka of Belarus hits a return to Sloane Stephens of the U.S. during their women's singles semi-final match at the Australian Open tennis tournament in Melbourne, January 24, 2013.DAVID GRAY/Reuters
Maria Sharapova of Russia hits a return to Li Na of China during their women's singles semi-final match at the Australian Open tennis tournament in Melbourne January 24, 2013.DAMIR SAGOLJ/Reuters
Russia's Maria Sharapova serves to China's Li Na during their semifinal match at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 24, 2013.Andrew Brownbill/The Associated Press
Serbia's Novak Djokovic celebrates after defeating Spain's David Ferrer in their semifinal match at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 24, 2013.Aaron Favila/The Associated Press
Maria Sharapova of Russia hits a return to Li Na of China during their women's singles semi-final match at the Australian Open tennis tournament in Melbourne January 24, 2013.DAVID GRAY/Reuters
Li Na of China (L) shakes hands with Maria Sharapova of Russia after defeating her in their women's singles semi-final match at the Australian Open tennis tournament in Melbourne January 24, 2013.DAMIR SAGOLJ/Reuters