JUST IN: Anger ruins 2020 US Open for Djokovic
Djokovic, down 5-6 in the first set, hit a ball at a line umpire. Djokovic looked to be cruising to a first set win, leading 5-4 and leading 40-0 but somehow Busta came back to even the set at 5-5. His frustration then boiled over as he smacked a ball directly at the line official, who crumpled to the court immediately.
