NEW YORK, NY - AUGUST 28: Thai-Son Kwiatkowski of the United States returns a shot during his first round Men's Singles match against Mischa Zverev of Germany on Day One of the 2017 US Open at the USTA Billie Jean King National Tennis Center on August 28, 2017 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)
