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Kristie Ahn of the United States returns a shot during the women's singles first round match against Caroline Wozniacki of Denmark at 2020 Australian Open in Melbourne, Australia, Jan. 20, 2020. (Xinhua/Bai Xuefei)

Kristie Ahn of the United States returns a shot during the women's singles first round match against Caroline Wozniacki of Denmark at 2020 Australian Open in Melbourne, Australia, Jan. 20, 2020. (Xinhua/Bai Xuefei)