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Novak Djokovic (L) of Serbia greets Dominic Thiem of Austria after their men's singles final at 2020 Australian Open in Melbourne, Australia on Feb. 2, 2020. (Xinhua/Zhu Wei)

Novak Djokovic (L) of Serbia greets Dominic Thiem of Austria after their men's singles final at 2020 Australian Open in Melbourne, Australia on Feb. 2, 2020. (Xinhua/Zhu Wei)