Serbian tennis star Novak Djokovic takes part in a training session during the 2016 Shanghai Rolex Masters tennis tournament in Shanghai, China, 13 Oc Stock Photo - Alamy
Novak Djokovic of Serbia takes part in a training session for the 2016 Shanghai Rolex Masters tennis tournament in Shanghai, China, 10 October 2016 Stock Photo - Alamy
Novak Djokovic of Serbia takes part in a training session for the 2016 Shanghai Rolex Masters tennis tournament in Shanghai, China, 9 October 2016 Stock Photo - Alamy
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Serbian tennis star Novak Djokovic takes part in a training session during the 2016 Shanghai Rolex Masters tennis tournament in Shanghai, China, 13 Oc Stock Photo - Alamy
Serbian tennis star Novak Djokovic takes part in a training session during the 2016 Shanghai Rolex Masters tennis tournament in Shanghai, China, 13 Oc Stock Photo - Alamy