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Rafael Nadal (L) of Spain greets Stefanos Tsitsipas of Greece after the men's singles semifinal match at the 2019 Australian Open in Melbourne, Australia, on Jan. 24, 2019. Rafael Nadal won 3-0. (Xinhua/Lui Siu Wai)

Rafael Nadal (L) of Spain greets Stefanos Tsitsipas of Greece after the men's singles semifinal match at the 2019 Australian Open in Melbourne, Australia, on Jan. 24, 2019. Rafael Nadal won 3-0. (Xinhua/Lui Siu Wai)