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Novak Djokovic (L) of Serbia hugs Rafael Nadal of Spain during the men's singles final match at 2019 Australian Open in Melbourne, Australia, Jan. 27, 2019. Novak Djokovic won 3-0. (Xinhua/Lui Siu Wai)

Novak Djokovic (L) of Serbia hugs Rafael Nadal of Spain during the men's singles final match at 2019 Australian Open in Melbourne, Australia, Jan. 27, 2019. Novak Djokovic won 3-0. (Xinhua/Lui Siu Wai)