Top seed Novak Djokovic has been disqualified from his US Open fourth-round match after accidentally hitting a ball at a line judge.
Djokovic showed his frustration after losing serve to trail 6-5 against Spain's Pablo Carreno Busta.
The Serbian world number one, 33, took a ball out of his pocket and hit it behind him, striking the female line judge in her throat.
After a lengthy discussion, he was defaulted by tournament officials.
A United States Tennis Association statement said: "In accordance with the Grand Slam rulebook, following his actions of intentionally hitting a ball dangerously or recklessly within the court or hitting a ball with negligent disregard of the consequences, the US Open tournament referee defaulted Novak Djokovic from the 2020 US Open.