Denis Istomin of Uzbekistan serves to Novak Djokovic of Serbia during their men's singles match at the Australian Open 2014 tennis tournament in Melbourne January 17, 2014. REUTERS/Petar Kujundzic ... more 
Denis Istomin of Uzbekistan serves to Novak Djokovic of Serbia 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 7:10 AM EST