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2019 US Open Tennis Tournament- Day Nine. Serena Williams of the United States celebrates her victory against Qiang Wang of China in the Women's Singles Quarter-Finals match on Arthur Ashe Stadium during the 2019 US Open Tennis Tournament at the USTA Billie Jean King National Tennis Center on September 3rd, 2019 in Flushing, Queens, New York City. (Photo by Tim Clayton/Corbis via Getty Images)

2019 US Open Tennis Tournament- Day Nine.  Serena Williams of the United States celebrates her victory against Qiang Wang of China in the Women's Singles Quarter-Finals match on Arthur Ashe Stadium during the 2019 US Open Tennis Tournament at the USTA Billie Jean King National Tennis Center on September 3rd, 2019 in Flushing, Queens, New York City.  (Photo by Tim Clayton/Corbis via Getty Images)

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2019 US Open Tennis Tournament- Day Nine. Qiang Wang of China during her match against Serena Williams of the United States in the Women's Singles Quarter-Finals match on Arthur Ashe Stadium during the 2019 US Open Tennis Tournament at the USTA Billie Jean King National Tennis Center on September 3rd, 2019 in Flushing, Queens, New York City. (Photo by Tim Clayton/Corbis via Getty Images)

2019 US Open Tennis Tournament- Day Nine.  Qiang Wang of China during her match against Serena Williams of the United States in the Women's Singles Quarter-Finals match on Arthur Ashe Stadium during the 2019 US Open Tennis Tournament at the USTA Billie Jean King National Tennis Center on September 3rd, 2019 in Flushing, Queens, New York City.  (Photo by Tim Clayton/Corbis via Getty Images)

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2019 US Open Tennis Tournament- Day Nine. Serena Williams of the United States in action against Qiang Wang of China in the Women's Singles Quarter-Finals match on Arthur Ashe Stadium during the 2019 US Open Tennis Tournament at the USTA Billie Jean King National Tennis Center on September 3rd, 2019 in Flushing, Queens, New York City. (Photo by Tim Clayton/Corbis via Getty Images)

2019 US Open Tennis Tournament- Day Nine.  Serena Williams of the United States in action against Qiang Wang of China in the Women's Singles Quarter-Finals match on Arthur Ashe Stadium during the 2019 US Open Tennis Tournament at the USTA Billie Jean King National Tennis Center on September 3rd, 2019 in Flushing, Queens, New York City.  (Photo by Tim Clayton/Corbis via Getty Images)

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2019 US Open Tennis Tournament- Day Nine. Qiang Wang of China attempt to reach a shot from Serena Williams of the United States in the Women's Singles Quarter-Finals match on Arthur Ashe Stadium during the 2019 US Open Tennis Tournament at the USTA Billie Jean King National Tennis Center on September 3rd, 2019 in Flushing, Queens, New York City. (Photo by Tim Clayton/Corbis via Getty Images)

2019 US Open Tennis Tournament- Day Nine.  Qiang Wang of China attempt to reach a shot from Serena Williams of the United States in the Women's Singles Quarter-Finals match on Arthur Ashe Stadium during the 2019 US Open Tennis Tournament at the USTA Billie Jean King National Tennis Center on September 3rd, 2019 in Flushing, Queens, New York City.  (Photo by Tim Clayton/Corbis via Getty Images)