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Croatia's Marin Cilic serves during the men's singles quarterfinal against Spain's Rafael Nadal at Australian Open 2018 in Melbourne, Australia, Jan. 23, 2018. (Xinhua/Bai Xuefei)
Croatia's Marin Cilic serves during the men's singles quarterfinal against Spain's Rafael Nadal at Australian Open 2018 in Melbourne, Australia, Jan. 23, 2018. (Xinhua/Bai Xuefei)