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Bai Yan of China returns a shot during a men's doubles quarterfinal match between Bai Yan/Sun Fajing of China and Jamie Cerretani of the United States/Sriram Balaji of India at 2019 Kunming Open tennis tournament in Anning of southwest China's Yunnan Province, on April 19, 2019. (Xinhua/Qin Qing)