Stanislas Wawrinka of Switzerland celebrates after defeating Novak Djokovic of Serbia in their quarterfinal at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 21, 2014.(AP Photo/Rick Rycroft)
Novak Djokovic of Serbia waves to the crowd after losing his quarterfinal match against Stanislas Wawrinka of Switzerland at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 21, 2014.(AP Photo/Rick Rycroft)
Stanislas Wawrinka of Switzerland celebrates after defeating Novak Djokovic of Serbia in their quarterfinal at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 21, 2014.(AP Photo/Rick Rycroft)
Stanislas Wawrinka of Switzerland celebrates after defeating Novak Djokovic of Serbia in their quarterfinal at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 21, 2014.(AP Photo/Rick Rycroft)