Novak Djokovic of Serbia celebrates after defeating Stan Wawrinka of Switzerland in their semifinal at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 30, 2015. (AP ... more 
Novak Djokovic of Serbia celebrates after defeating Stan Wawrinka of Switzerland in their semifinal at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 30, 2015. (AP Photo/Andy Brownbill) less 
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Associated Press | Photo By Andy Brownbill
Fri, Jan 30, 2015 7:27 AM EST