Zhang ShuaiFILE - Zhang Shuai, of China, plays a return to Petra Martic, of Croatia, during their second round match at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 19, 2023. Reilly Opelka, of the United States, and Zhang Shuai, of China, have pulled out of the U.S. Open, the U.S. Tennis Association announced Tuesday, Aug. 15, 2023. (AP Photo/Asanka Brendon Ratnayake, File) FILE PHOTO

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