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Alexander Zverev of Germany competes during the men's first round match against Aljaz Bedene of Slovenia at the 2019 Australian Open in Melbourne, Australia, Jan. 15, 2019. (Xinhua/Lui Siu Wai)

Alexander Zverev of Germany competes during the men's first round match against Aljaz Bedene of Slovenia at the 2019 Australian Open in Melbourne, Australia, Jan. 15, 2019. (Xinhua/Lui Siu Wai)