NEW YORK, NY - AUGUST 31: Serena Williams of the United States reacts against Venus Williams of the United States during their ladies singles third round match on Day Five of the 2018 US Open at the USTA Billie Jean King National Tennis Center on August 31, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Jaime Lawson/Getty Images for USTA)