NEW YORK, NY - AUGUST 28:  Bernard Tomic of Australia reacts during his first round Men's Singles match against Gilles Muller of Luxembourg 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)