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Roger Federer (R) of Switzerland greets John Millman of Australia after their men's singles third round match against at the 2020 Australian Open tennis tournament in Melbourne, Australia, Jan. 24, 2020. (Xinhua/Zhu Hongye)

Roger Federer (R) of Switzerland greets John Millman of Australia after their men's singles third round match against at the 2020 Australian Open tennis tournament in Melbourne, Australia, Jan. 24, 2020. (Xinhua/Zhu Hongye)