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2018 US Open Tennis Tournament- Day Twelve. Rafael Nadal of Spain is consoled by Juan Martin Del Potro of Argentina after Nadal retired injured after the second set 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. Rafael Nadal of Spain is consoled by Juan Martin Del Potro of Argentina after Nadal retired injured after the second set 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)