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Angelique Kerber of hits a return during the women's singles quarterfinal against Madison Keys of the at Australian Open 2018 in Melbourne, Australia, Jan. 24, 2018. Kerber won 2-0. (Xinhua/Bai Xuefei)

Angelique Kerber of hits a return during the women's singles quarterfinal against Madison Keys of the at Australian Open 2018 in Melbourne, Australia, Jan. 24, 2018. Kerber won 2-0. (Xinhua/Bai Xuefei)