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(210216) -- MELBOURNE, Feb. 16, 2021 (Xinhua) -- Grigor Dimitrov of Bulgaria hits a return during the men's singles quarterfinal match between Grigor Dimitrov of Bulgaria and Aslan Karatsev of Russia at Australian Open in Melbourne Park, in Melbourne, Australia, on Feb. 16, 2021. (Xinhua/Bai Xuefei) 16.02.2021 Melbourne Tenis Australian Open 2021 FOTO Bai Xuefei / Xinhua / PressFocus POLAND ONLY!!