Karen Khachanov (R) of Russia shakes hands with Roger Federer of Switzerland during the match between Switzerland and Russia at Hopman Cup mixed teams tennis tournament in Perth, Australia, Jan. 2, 2018. Roger Federer won 2-0. (Xinhua/Zhou Dan)
In pics: Hopman Cup mixed teams tennis tournament
Source: Xinhua| 2018-01-02 19:38:23|Editor: Chengcheng
