Jozef Kovalik Pictures
NEW YORK, NY - AUGUST 29: Jozef Kovalik of Slovakia serves to to Vasek Pospisil of Canada during his first round Men's Singles match on Day One of the 2016 US Open at the USTA Billie Jean King National Tennis Center on August 29, 2016 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Mike Hewitt/Getty Images)