In a statement, the USTA 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 U.S. Open tournament referee defaulted Novak Djokovic from the 2020 U.S. Open.\"

Djokovic apologized for the incident Sunday evening on social media.

\"This whole situation has left me really sad and empty. I checked on the lines person and the tournament told me that thank God she is feeling ok. I'm extremely sorry to have caused her such stress. So unintended. So wrong,\" he wrote.

\"As for the disqualification, I need to go back within and work on my disappointment and turn this all into a lesson for my growth and evolution as a player and human being. I apologize to the @usopen tournament and everyone associated for my behavior. I'm very grateful to my team and family for being my rock support, and my fans for always being there with me. Thank you and I'm so sorry,\" he added.

The USTA said that Djokovic will lose all ranking points he earned at the Open and will be fined the prize money won at the tournament and could face future fines because of the incident.

\"PHOTO:
Danielle Parhizkaran/USA TODAY Sports via Reuters
PHOTO: Novak Djokovic and a tournament official tend to a linesperson who was struck with a ball by Djokovic against Pablo Carreno Busta of Spain, Sept. 6, 2020, during the US Open in Queens, New York.
>

In his post-match press conference, Carreno Busta said he did not see the incident when it happened.

\"I was looking to my coach, celebrating the break. And when I turned back again the line umpire was on the floor,\" the Spaniard said. \"I was in shock because I never expected this moment.\"

Carreno Busta said officials made the right call.

\"The rules are the rules,\" he said. \"I think the referee and the supervisor did the right thing.\"

Friemel told ESPN that he did not see the incident live, but after speaking with the Tourte, Egli and Djokovic, it was evident there was a rules violation.

\"The facts clearly state that according to the rules he had to be defaulted.\" Friemel said, due to the fact that Djokovic's striking of the ball was reckless and with anger.

In total, Djokovic was slapped with $267,500 in fines as a result of the incident. He lost $250,000 in prize money and $10,000 for the rules violation associated with hitting the ball. On Monday, the USTA confirmed to ABC News that Djokovic received an additional $7,500 fine for skipping the mandatory post-match press conference after he left the grounds of the USTA Billie Jean King National Tennis Center Sunday without taking questions.

Friemel confirmed that Djokovic's intent was taken into consideration when assessing the fine. Had Djokovic intended to injure the line judge, the penalty would have been harsher, Friemel said.

\"We would have done the same decision on any other court with any other player,\" he added.

Former player James Blake applauded the USTA's decision.

\"To hear the referee say we are going to give the same treatment to every single player in the draw, it makes the rest of the draw, in my opinion, feel much better,\" he said.

Djokovic has won over $4 million this year in prize money and over $140 million since the start of his career.

Tennis champion John McEnroe, responding to Sunday's incident, said, \"It was a rookie mistake ... by him to not look and hit a ball back where he wasn't even looking where he was hitting it.\"

The Serbian grand slam champion had been the favorite to win the tournament, which has been played without fans due to the COVID-19 pandemic.

This year's U.S. Open will now be the first time since 2014 that the men's singles title will go to a first-time winner. The disqualification also breaks Djokovic's streak of 26 winning matches this year.

ABC News' Henderson Hewes contributed to this report.

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