Mona Barthel Pictures
NEW YORK, NY - AUGUST 28: Mona Barthel of Germany returns the ball during her women's singles first round match against Marketa Vondrousova of Czech Republic on Day Two of the 2018 US Open at the USTA Billie Jean King National Tennis Center on August 28, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Julian Finney/Getty Images)