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