AS Roma forward Adem Ljajic of Serbia celebrates after scoring during an Italian Serie A soccer match between AS Roma and Livorno at Rome's Olympic stadium, Saturday, Jan. 18, 2014. (AP Photo/Alessandra Tarantino)
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)
Novak Djokovic of Serbia celebrates after his win over Denis Istomin of Uzbekistan during their third round match at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 17, 2014.(AP Photo/Aaron Favila)
Novak Djokovic of Serbia changes his shirt between games as he plays Denis Istomin of Uzbekistan during their third round match at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 17, 2014.(AP Photo/Aaron Favila)
Samantha Stosur of Australia celebrates a point won against Ana Ivanovic of Serbia during their third round match at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 17, 2014.(AP Photo/Aaron Favila)
Ana Ivanovic of Serbia hits a smash to Samantha Stosur of Australia during their third round match at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 17, 2014.(AP Photo/Andrew Brownbill)