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Croatia's Marin Cilic (C) waves as he arrives on court to play Switzerland's Roger Federer in the men's singles final at the Australian Open 2018 in Melbourne, Australia, Jan. 28, 2018. (Xinhua/Li Peng)

Croatia's Marin Cilic (C) waves as he arrives on court to play Switzerland's Roger Federer in the men's singles final at the Australian Open 2018 in Melbourne, Australia, Jan. 28, 2018. (Xinhua/Li Peng)