Novak Djokovic was defaulted in the fourth round of the 2020 US Open on Sunday after hitting a ball in frustration that struck a line judge on the court at Arthur Ashe Stadium. That line judge was hit in the throat and had to be helped off the court after appearing to have trouble breathing. Djokovic, a 17-time Grand Slam champion, was disqualified from the tournament. Here are some looks at the incident: The US Open released this statement shortly after Djokovic was defaulted: In accordance with the Grand Slam rulebook, following his actions of intentionally hitting a ball dangerously...