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NEW YORK, NEW YORK - SEPTEMBER 11: Juncheng Shang of China returns the ball as he plays against Daniel Rincon of Spain during their Boys' Singles final match on Day Thirteen of the 2021 US Open at the USTA Billie Jean King National Tennis Center on September 11, 2021 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Sarah Stier/Getty Images)

NEW YORK, NEW YORK - SEPTEMBER 11: Juncheng Shang of China returns the ball as he plays against Daniel Rincon of Spain during their Boys' Singles final match on Day Thirteen of the 2021 US Open at the USTA Billie Jean King National Tennis Center on September 11, 2021 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Sarah Stier/Getty Images)