NEW YORK, NY - AUGUST 28: Gilles Muller of Luxembourg returns a shot during his first round Men's Singles match against Bernard Tomic of Australia 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 Clive Brunskill/Getty Images)
