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Victoria Azarenka of Belarus celebrates defeating Angelique Kerber of Germany during their 2015 US Open women's singles round 3 match at USTA Billie Jean King National Tennis Center in New York on September 5, 2015. Azarenka won 7-5, 2-6, 6-4. AFP PHOTO/ JEWEL SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

Victoria Azarenka of Belarus celebrates defeating Angelique Kerber of Germany during their 2015 US Open women's singles round 3 match at USTA Billie Jean King National Tennis Center in New York on September 5, 2015. Azarenka won 7-5, 2-6, 6-4. AFP PHOTO/ JEWEL SAMAD        (Photo credit should read JEWEL SAMAD/AFP/Getty Images)