NEW YORK, NY - AUGUST 27: Petra Martic of Croatia returns the ball during her women's singles first round match against Lucie Safarova of Czech Republic on Day One of the 2018 US Open at the USTA Billie Jean King National Tennis Center on August 27, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Al Bello/Getty Images)
