NEW YORK, NEW YORK - SEPTEMBER 07: Serena Williams of the United States looks frustrated during her match against Bianca Andreescu of Canada at Arthur Ashe Stadium at the USTA Billie Jean King National Tennis Center on September 07, 2019 in New York City. (Photo by TPN/Getty Images)
NEW YORK, NEW YORK - SEPTEMBER 07: Bianca Andreescu of Canada poses with the women's singles trophy after her 6-3 7-5 victory over Serena Williams of the United States at Arthur Ashe Stadium at the USTA Billie Jean King National Tennis Center on September 07, 2019 in New York City. (Photo by TPN/Getty Images)
NEW YORK, NEW YORK - SEPTEMBER 07: (L-R) Bianca Andreescu of Canada is congratulated by Serena Williams of the United States after winning the Women's Singles final match on day thirteen of the 2019 US Open at the USTA Billie Jean King National Tennis Center on September 07, 2019 in the Queens borough of New York City. (Photo by Clive Brunskill/Getty Images)
