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Novak Djokovic of Serbia serves during the men's singles quarterfinal match against Kei Nishikori of Japan at the Wimbledon Championships 2018 in London, Japan, on July 11, 2018. Novak Djokovic won 3-1. (Xinhua/Guo Qiuda)
Novak Djokovic of Serbia serves during the men's singles quarterfinal match against Kei Nishikori of Japan at the Wimbledon Championships 2018 in London, Japan, on July 11, 2018. Novak Djokovic won 3-1. (Xinhua/Guo Qiuda)