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Coco Vandeweghe of the returns the ball during the group match between U.S. and at the Hopman Cup mixed teams tennis tournament in Perth, Australia, Jan. 1, 2018. Team U.S. won 2-1. (Xinhua/Zhou Dan)

Coco Vandeweghe of the returns the ball during the group match between U.S. and at the Hopman Cup mixed teams tennis tournament in Perth, Australia, Jan. 1, 2018. Team U.S. won 2-1. (Xinhua/Zhou Dan)