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NEW YORK, NY - SEPTEMBER 08: Angelique Kerber of Germany celebrates defeating Caroline Wozniacki of Denmark during their Women's Singles Semifinal Match on Day Eleven of the 2016 US Open at the USTA Billie Jean King National Tennis Center on September 8, 2016 in the Queens borough of New York City. (Photo by Mike Stobe/Getty Images for USTA)

NEW YORK, NY - SEPTEMBER 08:  Angelique Kerber of Germany celebrates defeating Caroline Wozniacki of Denmark during their Women's Singles Semifinal Match on Day Eleven of the 2016 US Open at the USTA Billie Jean King National Tennis Center on September 8, 2016 in the Queens borough of New York City.  (Photo by Mike Stobe/Getty Images for USTA)