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Alexander Zverev of Germany celebrates during the men's singles 3rd round match against Alex Bolt of Australia at the Australian Open in Melbourne, Australia, Jan. 19, 2019. (Xinhua/Hu Jingchen)

Alexander Zverev of Germany celebrates during the men's singles 3rd round match against Alex Bolt of Australia at the Australian Open in Melbourne, Australia, Jan. 19, 2019. (Xinhua/Hu Jingchen)