Novak Djokovic of Serbia hits a return to Denis Istomin of Uzbekistan during their men's singles match at the Australian Open 2014 tennis tournament in Melbourne January 17, 2014. REUTERS/Petar ... more 
Novak Djokovic of Serbia hits a return to Denis Istomin of Uzbekistan during their men's singles match at the Australian Open 2014 tennis tournament in Melbourne January 17, 2014. REUTERS/Petar Kujundzic (AUSTRALIA - Tags: SPORT TENNIS) less 
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Reuters | Photo By PETAR KUJUNDZIC / REUTERS
Fri, Jan 17, 2014 7:14 AM EST