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

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