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Japan's Kei Nishikori returns a shot against Croatia's Marin Cilic during the US Open men's singles final at the USTA Billie Jean King National Tennis Center in New York on Sept. 8, 2014. 24-year-old Nishikori was defeated by the 14th-seeded Cilic 3-,3-6,3-6. ( The Yomiuri Shimbun via AP Images ) (KEYSTONE/AP Yomiuri Shimbun/Ichiro Ohara)