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