Spain's Rafael Nadal(L) and Switzerland's Roger Federer pose for photo prior to the men's singles final at the Australian Open tennis championships in Melbourne, Australia, Jan. 29, 2017. (Xinhua/Lui Siu Wai)
Spain's Rafael Nadal(L) and Switzerland's Roger Federer pose for photo prior to the men's singles final at the Australian Open tennis championships in Melbourne, Australia, Jan. 29, 2017. (Xinhua/Lui Siu Wai)