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Serbia's Novak Djokovic serves during the men's singles quarterfinal match against Kevin Anderson of South Africa at the Shanghai Masters tennis tournament on Oct. 12, 2018. Novak Djokovic won 2-0. (Xinhua/Ding Ting)
Serbia's Novak Djokovic serves during the men's singles quarterfinal match against Kevin Anderson of South Africa at the Shanghai Masters tennis tournament on Oct. 12, 2018. Novak Djokovic won 2-0. (Xinhua/Ding Ting)