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Daria Gavrilova of Australia serves during a match between Germany and Australia at Hopman Cup mixed teams tennis tournament in Perth, Australia, on Jan. 5, 2018. (Xinhua/Zhou Dan)
Daria Gavrilova of Australia serves during a match between Germany and Australia at Hopman Cup mixed teams tennis tournament in Perth, Australia, on Jan. 5, 2018. (Xinhua/Zhou Dan)