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Rafael Nadal of Spain competes during the ATP Cup quarter final match against David Goffin of Belgium in Sydney, Australia, on Jan. 10, 2020. (Xinhua/Zhu Hongye)

Rafael Nadal of Spain competes during the ATP Cup quarter final match against David Goffin of Belgium in Sydney, Australia, on Jan. 10, 2020. (Xinhua/Zhu Hongye)