Novak Djokovic was defaulted from his U.S. Open fourth-round match after it appeared he accidentally hit a linesperson with a ball he struck after a point.
Djokovic, trailing Spainiard Pablo Carreno Busta 6-5 in the first set, hit a ball toward the back of his side of the court after having his serve broken. Moments later, a linesperson in that area was shown sitting on the court, motioning to their throat.
Djokovic, once he saw where the ball went, went over to help the linesperson.
The linesperson got up and walked off.