Novak Djokovic of Serbia reacts during the match against Jo-Wilfried Tsonga of France on day nine of the 2016 US Open tennis tournament at USTA Billie Jean King National Tennis Center, in New York on Sept 6, 2016. Djokovic, the defending champion, entered the semifinals as his opponent Tsonga was unable to finish the match due to knee injury. [Photo/Agencies]
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