Kurumi Nara of Japan reacts after losing a point during her third round match against Jelena Jankovic of Serbia at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014.(AP Photo/Rick Rycroft)
Jelena Jankovic of Serbia celebrates after her win over Kurumi Nara of Japan during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014. (AP Photo/Rick Rycroft)
Jelena Jankovic of Serbia, left, is congratulated by Kurumi Nara of Japan, after her win in their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014. (AP Photo/Rick Rycroft)
Jelena Jankovic of Serbia makes a forehand return to Kurumi Nara of Japan during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014.(AP Photo/Rick Rycroft)
Rafael Nadal of Spain celebrates his win over Gael Monfils of France during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014.(AP Photo/Aaron Favila)
Grigor Dimitrov of Bulgaria celebrates his win over Milos Raonic of Canada during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014.(AP Photo/Andrew Brownbill)
Roger Federer of Switzerland reaches for a shot to Teymuraz Gabashvili of Russia during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014.(AP Photo/Eugene Hoshiko)
Stefan Edberg, former Grand Slam champion and coach of Switzerland's Roger Federer, smiles as Federer won over Teymuraz Gabashvili of Russia in their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014.(AP Photo/Aaron Favila)
Mirka Federer, wife of Switzerland's Roger Federer, watches his match against Teymuraz Gabashvili of Russia during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014.(AP Photo/Aaron Favila)
Roger Federer of Switzerland makes a forehand return to Teymuraz Gabashvili of Russia during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014.(AP Photo/Aaron Favila)
Rafael Nadal of Spain dries his body with a towel during a break in his third round match against Gael Monfils of France at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014.(AP Photo/Aaron Favila)
Maria Sharapova of Russia walks on the court as she plays Alize Cornet of France during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014. (AP Photo/Eugene Hoshiko)
Rafael Nadal of Spain makes a backhand return to Gael Monfils of France during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014.(AP Photo/Eugene Hoshiko)
Victoria Azarenka of Belarus prepares for her third round match against Yvonne Meusburger of Austria at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014.(AP Photo/Aaron Favila)
Victoria Azarenka of Belarus makes a forehand return to Yvonne Meusburger of Austria during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014. (AP Photo/Aaron Favila)
Sloane Stephens of the U.S. celebrates after her win over Elina Svitolina of Ukraine during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014.(AP Photo/Andrew Brownbill)
Rafael Nadal of Spain reaches for a shot to Gael Monfils of France during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014.(AP Photo/Eugene Hoshiko)
Maria Sharapova, left, of Russia blows kisses to the crowd after defeating Alize Cornet of France after winning their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014.(AP Photo/Aaron Favila)
Roger Federer of Switzerland celebrates his win over Teymuraz Gabashvili of Russia during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014.(AP Photo/Aaron Favila)