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(210217) -- MELBOURNE, Feb. 17, 2021 (Xinhua) -- Stefanos Tsitsipas (R) celebrates with his father Apostolos after winning the men's singles quarterfinal match between Rafael Nadal of Spain and Stefanos Tsitsipas of Greece at Australian Open in Melbourne Park, in Melbourne, Australia, on Feb. 17, 2021. (Xinhua/Bai Xuefei) 2021.02.17 Melbourne Tenis Australian Open Foto Bai Xuefei/Xinhua/PressFocus !!! POLAND ONLY !!!