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Rafael Nadal (R) of hugs Diego Schwartzman of Argentina after their men's singles fourth round match at Australian Open 2018 in Melbourne, Australia, Jan. 21, 2018. Rafael Nadal won 3-1. (Xinhua/Li Peng)

Rafael Nadal (R) of hugs Diego Schwartzman of Argentina after their men's singles fourth round match at Australian Open 2018 in Melbourne, Australia, Jan. 21, 2018. Rafael Nadal won 3-1. (Xinhua/Li Peng)