NEW YORK, NEW YORK - AUGUST 22: Goran Ivanisevic watches Novak Djokovic of Serbia practice for the US Open at the USTA Billie Jean King National Tennis Center on August 22, 2019 in New York City. (Photo by Matthew Stockman/Getty Images)
NEW YORK, NEW YORK - AUGUST 22: Goran Ivanisevic watches Novak Djokovic of Serbia practice for the US Open at the USTA Billie Jean King National Tennis Center on August 22, 2019 in New York City. (Photo by Matthew Stockman/Getty Images)