NEW YORK, NY - SEPTEMBER 01: Marketa Vondrousova of Czech Republic reacts during her women's singles third round match against Kiki Bertens of the Netherlands on Day Six of the 2018 US Open at the USTA Billie Jean King National Tennis Center on September 1, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Al Bello/Getty Images)
