Bernard Tomic of Australia clenches his fist and yells out loud after winning his match against Blaz Kavcic of Slovakia during the Sydney International Tennis Tournament in Sydney, Australia, Wednesday, Jan. 8, 2014. (AP Photo/Rob Griffith)
Bernard Tomic of Australia plays a forehand shot in his match against Blaz Kavcic of Slovakia during the Sydney International Tennis Tournament in Sydney, Australia, Wednesday, Jan. 8, 2014. (AP Photo/Rob Griffith)
Dominika Cibulkova of Slovakia reacts after winning a point against Angelique Kerber of Germany during their women's singles match at the Sydney International tennis tournament in Sydney, Australia, Monday, Jan. 6, 2014. (AP Photo/Daniel Munoz)
Angelique Kerber of Germany reacts after winning a point against Dominika Cibulkova of Slovakia during their women's singles match at the Sydney International tennis tournament in Sydney, Australia, Monday, Jan. 6, 2014. (AP Photo/Daniel Munoz)