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2019 US Open Tennis Tournament- Day Three. Kei Nishikori of Japan reacts during his match against Bradley Klahn of the United States in the Men's Singles Round Two match on Louis Armstrong Stadium at the 2019 US Open Tennis Tournament at the USTA Billie Jean King National Tennis Center on August 27th, 2019 in Flushing, Queens, New York City. (Photo by Tim Clayton/Corbis via Getty Images)

2019 US Open Tennis Tournament- Day Three. Kei Nishikori of Japan reacts during his match against Bradley Klahn of the United States in the Men's Singles Round Two match on Louis Armstrong Stadium at the 2019 US Open Tennis Tournament at the USTA Billie Jean King National Tennis Center on August 27th, 2019 in Flushing, Queens, New York City.  (Photo by Tim Clayton/Corbis via Getty Images)