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2018 US Open Tennis Tournament- Day Twelve. Michael Chang, (right), coach of Kei Nishikori of Japan watching him in action against Novak Djokovic of Serbia in the Men's Singles Semi Final match on Arthur Ashe Stadium at the 2018 US Open Tennis Tournament at the USTA Billie Jean King National Tennis Center on September 7th, 2018 in Flushing, Queens, New York City. (Photo by Tim Clayton/Corbis via Getty Images

2018 US Open Tennis Tournament- Day Twelve.  Michael Chang, (right), coach of Kei Nishikori of Japan watching him in action against Novak Djokovic of Serbia in the Men's Singles Semi Final match on Arthur Ashe Stadium at the 2018 US Open Tennis Tournament at the USTA Billie Jean King National Tennis Center on September 7th, 2018 in Flushing, Queens, New York City.  (Photo by Tim Clayton/Corbis via Getty Images