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Dayana Yastremska of Ukraine is in action during her women's singles third round match against Serena Williams of the United States at the Australian Open in Melbourne, Australia, Jan. 19, 2019. (Xinhua/Bai Xue)
Dayana Yastremska of Ukraine is in action during her women's singles third round match against Serena Williams of the United States at the Australian Open in Melbourne, Australia, Jan. 19, 2019. (Xinhua/Bai Xue)