Uzbekistan's Denis Istomin celebrates during the men's singles second round match against Serbia's Novak Djokovic at the Australian Open Tennis Championships in Melbourne, Australia, Jan. 19, 2017. Djokovic lost 2-3. (Xinhua/Lui Siu Wai)
Uzbekistan's Denis Istomin celebrates during the men's singles second round match against Serbia's Novak Djokovic at the Australian Open Tennis Championships in Melbourne, Australia, Jan. 19, 2017. Djokovic lost 2-3. (Xinhua/Lui Siu Wai)