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kiki Bertens of Netherlands competes during the women's second round match against Anastasia Pavlyuchenkova of Russia at the 2019 Australian Open in Melbourne, Australia, Jan. 16, 2019. (Xinhua/Hu Jingchen)

kiki Bertens of Netherlands competes during the women's second round match against Anastasia Pavlyuchenkova of Russia at the 2019 Australian Open in Melbourne, Australia, Jan. 16, 2019. (Xinhua/Hu Jingchen)