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Rafael Nadal of Spain serves during the men's first round match between against James Duckworth of Australia at the 2019 Australian Open in Melbourne, Australia, Jan. 14, 2019. Rafael Nadal won 3-0. (Xinhua/Bai Xuefei)

Rafael Nadal of Spain serves during the men's first round match between against James Duckworth of Australia at the 2019 Australian Open in Melbourne, Australia, Jan. 14, 2019. Rafael Nadal won 3-0. (Xinhua/Bai Xuefei)