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Angelique Kerber of Germany celebrates after defeating Caroline Wozniacki of Denmark during their 2016 US Open Womens Singles semifinal match at the USTA Billie Jean King National Tennis Center in New York on September 8, 2016. / AFP / Timothy A. CLARY (Photo credit should read TIMOTHY A. CLARY/AFP via Getty Images)

Angelique Kerber of Germany celebrates after defeating Caroline Wozniacki of Denmark during their 2016 US Open Womens Singles semifinal match at the USTA Billie Jean King National Tennis Center in New York on September 8, 2016. / AFP / Timothy A. CLARY        (Photo credit should read TIMOTHY A. CLARY/AFP via Getty Images)