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Elise Mertens of Belgium hits a return during the match between Australia and Belgium at Hopman Cup mixed teams tennis tournament in Perth, Australia, Jan. 3, 2018. (Xinhua/Zhou Dan)
Elise Mertens of Belgium hits a return during the match between Australia and Belgium at Hopman Cup mixed teams tennis tournament in Perth, Australia, Jan. 3, 2018. (Xinhua/Zhou Dan)