NEW YORK, NEW YORK - SEPTEMBER 06: Novak Djokovic of Serbia walks off the court after being defaulted due to inadvertently striking a lineswoman with a ball hit in frustration during his Men's Singles fourth round match against Pablo Carreno Busta of Spain on Day Seven of the 2020 US Open at the USTA Billie Jean King National Tennis Center on September 6, 2020 in the Queens borough of New York City. (Photo by Al Bello/Getty Images)
