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Guido Pella of Argentina hits the ball during the men's singles third round match against Fabio Fognini of Italy at the 2020 Australian Open tennis tournament in Melbourne, Australia, Jan. 24, 2020. (Xinhua/Bai Xue)

Guido Pella of Argentina hits the ball during the men's singles third round match against Fabio Fognini of Italy at the 2020 Australian Open tennis tournament in Melbourne, Australia, Jan. 24, 2020. (Xinhua/Bai Xue)