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FLUSHING MEADOW, NY - SEPTEMBER 05: Kei Nishikori (JPN) celebrates defeating Marin Cilic (CRO) in the quarter final of the Men's Singles Championships at the US Open on September 05, 2018, played at the Billie Jean King Tennis Center in Flushing Meadow, NY. (Photo by Cynthia Lum/Icon Sportswire via Getty Images)