Switzerland's Roger Federer competes during the men's singles final match against Croatia's Marin Cilic at Australian Open 2018 in Melbourne, Australia, Jan. 28, 2018. (Xinhua/Bai Xuefei)
Croatia's Marin Cilic competes during the men's singles final match against Switzerland's Roger Federer at Australian Open 2018 in Melbourne, Australia, Jan. 28, 2018. (Xinhua/Li Peng)