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Australian Open men's singles champion Novak Djokovic of Serbia poses for photographs with the winner's trophy at Royal Botanic Gardens Victoria in Melbourne, Australia on Feb. 3, 2020. (Photo by Bai Xue/Xinhua)

Australian Open men's singles champion Novak Djokovic of Serbia poses for photographs with the winner's trophy at Royal Botanic Gardens Victoria in Melbourne, Australia on Feb. 3, 2020. (Photo by Bai Xue/Xinhua)