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Katerina Siniakova of the Czech Republic hits a return to Petra Kvitova of the Czech Republic during their women's singles first round match at 2020 Australian Open in Melbourne, Australia, Jan. 20, 2020. (Xinhua/Wang Jingqiang)

Katerina Siniakova of the Czech Republic hits a return to Petra Kvitova of the Czech Republic during their women's singles first round match at 2020 Australian Open in Melbourne, Australia, Jan. 20, 2020. (Xinhua/Wang Jingqiang)