Novak Djokovic of Serbia hits a return against Milos Raonic of Canada during their men's singles quarter-final match at the Australian Open 2015 tennis tournament in Melbourne January 28, 2015. ... more 
Novak Djokovic of Serbia hits a return against Milos Raonic of Canada during their men's singles quarter-final match at the Australian Open 2015 tennis tournament in Melbourne January 28, 2015. REUTERS/Thomas Peter (AUSTRALIA - Tags: SPORT TENNIS) less 
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Reuters | Photo By THOMAS PETER / REUTERS
Wed, Jan 28, 2015 5:46 AM EST