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Ito Tatsuma of Japan reacts during the men's singles second round match against Novak Djokovic of Serbia at the 2020 Australian Open tennis tournament in Melbourne, Australia, Jan. 22, 2020. (Xinhua/Zhu Wei)

Ito Tatsuma of Japan reacts during the men's singles second round match against Novak Djokovic of Serbia at the 2020 Australian Open tennis tournament in Melbourne, Australia, Jan. 22, 2020. (Xinhua/Zhu Wei)