The world number one apologized for hitting the ball in disgust after losing his serve to go 6-5 down in the first set to Spain’s unseeded Pablo Carreno Busta inside Arthur Ashe Stadium.
Djokovic appeared to be looking the other way when he pulled the ball from his pocket and smacked it in the direction of the official, it hitting her full toss in the throat.
The official cried out and began gasping for air as she collapsed to the ground.
Djokovic rushed over to her to check if she was okay and placed his hand on her back as she struggled to breathe. After a few minutes she got up and walked off the court looking dazed.
Around ten minutes of discussions then ensued between Djokovic and the tournament referee Soeren Friemel, during which the world number one pleaded his case.
The umpire then declared that Carreno Busta had won by default. Djokovic shook hands with his opponent before leaving the court without appearing to shake the umpire’s hand.
He went then directly to his car and left the Flushing Meadows site in New York without speaking to reporters.
Djokovic, 33, later posted an apology on Instagram saying he was “so sorry.”
“This whole situation has left me really sad and empty,” he wrote, adding that “thank God” the woman was okay.
“I’m extremely sorry to have caused her such stress. So unintended. So wrong,” Djokovic said.
View this post on Instagram
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. I’m not disclosing her name to respect her privacy. 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. Cela ova situacija me cini zaista tužnim i praznim. Proverio sam kako se oseca linijski sudija, i prema informacijama koje sam dobio, oseca se dobro, hvala Bogu. Njeno ime ne mogu da otkrijem zbog ocuvanja njene privatnosti. Jako mi je žao što sam joj naneo takav stres. Nije bilo namerno. Bilo je pogrešno. Želim da ovo neprijatno iskustvo, diskvalifikaciju sa turnira, pretvorim u važnu životnu lekciju, kako bih nastavio da rastem i razvijam se kao covek, ali i teniser. Izvinjavam se organizatorima US Opena. Veoma sam zahvalan svom timu i porodici što mi pružaju snažnu podršku, kao i mojim navijacima jer su uvek uz mene. Hvala vam i žao mi je. Bio je ovo težak dan za sve.
He also apologized to tournament organizers for “my behavior” but did not say whether he thought they were right to default him.
The United States Tennis Association said Djokovic had been defaulted under the Grand Slam rules for “intentionally hitting a ball dangerously or recklessly within the court or hitting a ball with negligent disregard of the consequences.”
The body added that he would lose all ranking points and prize money from the tournament.
Referee Friemel said Djokovic told him he should not be defaulted because it was unintentional.
Friemel said he agreed there was no intent but that it was a clear-cut case of Djokovic hitting the ball “angrily and recklessly.”
“She was clearly hurt and in pain. There was no other option,” he told reporters.
The Serbian star is one of only a handful of players to be disqualified from a men’s singles tournament at a Grand Slam since John McEnroe was infamously tossed from the Australian Open in 1990.
Djokovic had been chasing an 18th Grand Slam title at the Billie Jean King US National Tennis Center.
He was hoping to close the gap on Roger Federer and Rafael Nadal, both absent from the tournament, in the race for the all-time men’s Slam singles title record.
Djokovic is on 17, with Nadal on 19 and Federer on 20.
Carreno Busta said he did not see the incident.
“I was celebrating the break with my coach,” he told reporters.
“When I heard that the line judge was on the floor I was in shock. I never expected this moment when playing Novak.
“I think it was bad luck,” he added.
Oh my god, Djokovic got disqualified from the US Open.https://t.co/yCo3Lqw0tg
— Dov Kleiman (@NFL_DovKleiman) 1599423502000
Former players reacted with shock at the disqualification but said officials had made the correct decision.
“Right call!” former women’s world number one Tracy Austin wrote on Twitter.
Right call! Stunning to watch this unfold. Hope lines person ok.🙏@DjokerNole clear favorite to win 18th GS-shrink m… https://t.co/ivPti1b9I6
— Tracy Austin (@thetracyaustin) 1599424968000
Four-time US Open champion Martina Navratilova said officials “had no choice” but to default Djokovic.
Former British number one Greg Rusedski described the disqualification as “unbelievable” but said officials had made the “correct decision.”
A USTA spokesperson said the line judge was “doing okay” after receiving treatment from medical staff.
USTA statement on default of Novak Djokovic: https://t.co/dqlt0mokg9
— US Open Tennis (@usopen) 1599426642000
Djokovic had been the overwhelming favorite to capture a fourth US Open title.
His disqualification blows the men’s draw wide open and means it will crown a first-time Grand Slam winner next Sunday.
“Now it gets interesting,” said fifth seed Alexander Zverev, who described Djokovic as “very unlucky.”
“There’s no past Grand Slam champions left in the draw.
“It’s going to be one of the young guys,” who wins, Zverev added after becoming the first German to reach the US Open last eight since Tommy Haas in 2007.
Zverev, the fifth seed, bulldozed Spain’s unseeded Alejandro Davidovich Fokina 6-2, 6-2, 6-1 in just 1hr 34 min.