However, the Dane says her retirement has “nothing to do with my health and this isn’t a goodbye”.
In a lengthy post on Instagram, the 2018 Australian Open champion says she plans to focus on her life away from tennis, including plans to start a family with her New York Knicks player husband David Lee.
Wozniacki’s career includes 30 WTA singles titles, reaching world number one in 2010, a WTA Finals victory and competing in three Olympics.
“I’ve always told myself, when the time comes, that there are things away from tennis that I want to do more, then it’s time to be done. In recent months, I’ve realised that there is a lot more in life that I’d like to accomplish off the court,” she wrote.
“I’ve played professionally since I was 15 years old and in that time I’ve experienced an amazing first chapter of my life… [and] I’ve accomplished everything I could ever dream of on the court.”
“Getting married to David was one of those goals and starting a family with him while continuing to travel the world and helping raise awareness about rheumatoid arthritis are all passions of mine moving forward.”
Signing off her statement, Wozniacki said: “I want to thank with all my heart, the fans, my friends, my sponsors, my team, especially my father as my coach, my husband, and my family for decades of support… without all of you I could have never have done this.”
Tennis Australia has reiterated its stance against Margaret Court’s “demeaning” personal views after announcing it will “recognise” the 50th anniversary of her Grand Slam at next year’s Australian Open.
Australian Court, 77, won all four Grand Slam titles in 1970.
In 2003, Melbourne Park’s Court One was renamed the Margaret Court Arena.
However, there have been recent calls for it to be renamed because of Court’s opposition to same-sex marriage.
In 2017, Court – who won a record 24 Grand Slam singles titles – said tennis was “full of lesbians” and that transgender children were the work of “the devil”.
Now a Christian pastor, she had previously said she would not fly on Australian airline Qantas “where possible” in protest at its support of same-sex marriage.
Grand Slam winners Martina Navratilova and Billie Jean King, who are both gay, have previously criticised Court.
Tennis Australia has invited Court, her family and friends to the tournament – which starts on 20 January – where she will participate in a “significant programme of events”.
“This is an incredible milestone for me, and I can’t quite believe how quickly the time has gone. It’s always wonderful to catch up with my fellow legends and I’m grateful to Tennis Australia,” said Court.
“Tennis is a wonderful sport and I’m proud to be part of the history of our great game.”
Tennis Australia said it respects Court’s “unmatched tennis career” but said her views “do not align” with its values of “equality, diversity and inclusion”.
“As often stated, Tennis Australia does not agree with Margaret’s personal views, which have demeaned and hurt many in our community over a number of years,” the governing body said in a statement.
In an open letter, it also said it would not “rewrite history” concerning Court’s achievements.
“Tennis Australia recognises the champions in our sport as a matter of course, whether it be stadium names, naming of parks, statues around the country and trophies and awards during a player’s career,” it added.
“We celebrate sporting heroes who inspire and motivate people through the generations, and who are lauded and respected widely by their peers and the broader community.
“As with other great sports in this country and elsewhere, it is common practice to draw a distinction between recognising champions and celebrating heroes, and it is an important distinction.
“Australia is fortunate that Margaret Court’s extraordinary playing achievements form part of our national tennis history.
“However, the philosophy and culture of our sport goes deeper than winning and setting records. We seek to foster a sport that is inclusive and welcoming of everyone.
“We all bear some responsibility for creating a safe and inclusive society. As a sport, tennis is unwavering in playing our part.”
Andy Murray’s journey from a tearful admission that his career was likely to end after a major hip surgery to winning an ATP title less than a year later is one of 2019’s greatest sporting stories.
Now the British former world number one’s emotional journey over the past two years has been laid bare in a behind-the-scenes documentary, Andy Murray: Resurfacing, which is being aired on Amazon Prime from Friday.
Here are eight things we’ve learned from it:
His childhood experiences in Dunblane led to anxiety
Murray, 32, grew up in the Scottish town of Dunblane and was a pupil of the local primary school when Thomas Hamilton killed 16 children and their teacher in March 1996. He hid in the headmaster’s study when the tragedy unfolded.
Murray knew the gunman and opens up about the traumatic experiences of that day, along with other emotional family experiences which have shaped his life.
After previously being asked by director Olivia Cappuccini why tennis is important to him, the three-time Grand Slam champion finally responds in a powerful late-night voice message.
“Obviously I had the thing that happened at Dunblane, when I was around nine,” he tells Cappuccini, who is the partner of Murray’s brother-in-law, in December 2018.
“I am sure for all the kids there it would be difficult for different reasons. The fact we knew the guy, we went to his kids’ club, he had been in our car, we had driven and dropped him off at train stations and things.
“And within 12 months of that, our parents got divorced. It is a difficult time for kids, to see that and not quite understand what is going on.
“And then six to 12 months after that, my brother Jamie also moved away from home. He went away to train to play tennis. We obviously used to do everything together. When he moved away that was also quite hard for me.
“Around that time and after that, for a year or so, I had lots of anxiety that came out when I was playing tennis. When I was competing I would get really bad breathing problems.
“Tennis is an escape for me in some ways because all of these things are bottled up and we don’t talk about these things.
“Tennis allows me to be that child. That’s why it is important to me.”
One of the most striking moments of the first comeback was the scene where, after he had beaten Romanian Marius Copil in the Washington Open third round at 3:02am local time, the Scot sat down in his chair, draped a towel over his head and sobbed uncontrollably for several minutes on court.
Now we are told the full extent of his mental state. That was the moment when he felt his career was coming to an end.
In a video message filmed at 5:09am in the American capital, he says: “I was really, really emotional at the end of the match because I feel this is the end for me.
“My body just doesn’t want to do it any more and my mind doesn’t want to push through the pain barrier any more.
“I was just hoping I was gonna feel better than this after 16, 17 months.
“It’s just an emotional night because I felt I’m coming to an end. I’m really sad about that because I want to keep going but my body is telling me ‘no’.
“It hurts and I’m sorry, I can’t keep going.”
Wife Kim told him to quit after ‘bleak’ Christmas phone call
After another tough training block in Miami towards the end of 2018, Murray said he was getting “zero enjoyment” from being on court.
He calls his wife Kim, who was back home in London, in a phone conversation which she describes as “pretty bleak”.
“He always wanted someone to tell him to stop and I’d tried to explain nobody could because it was nobody’s decision to make other than his,” she says.
“I knew that is what he wanted and I knew what he was calling me for.
“I told him ‘you’re clearly not happy, you said you’d give it until Christmas – I was putting the Christmas tree up – call it a day’.”
He almost changed his mind about emotional Australian Open announcement
Although Murray had privately been thinking he was approaching the end, he had given few clues publicly and that meant a tearful announcement in a pre-tournament news conference at the Australian Open surprised the world.
Murray said he thought he could get through the pain until Wimbledon and then stop playing, although he also conceded the Grand Slam in Melbourne might be his last tournament.
Yet on the morning of his planned admission he still had doubts whether he should reveal all.
“I’m going to say something today, I know I’ll get emotional,” he says, two hours before facing the media.
“But I change my mind all the time. I need to say something. Or I don’t.”
Murray describes how he is feeling nervous, anxious and has butterflies in his stomach, while walking around that morning without much pain in his hip.
“When making a decision like that I want my leg to feel really sore,” he says.
That led to doubts. So he calls his physio Shane Annum. “I’m thinking I’m making a mistake,” Murray says.
His surgeon warned him of the dangers of making a tennis comeback
Murray eventually chose to have the resurfacing operation with renowned surgeon Sarah Muirhead-Allwood, who had previously operated on the Queen Mother, at the London Hip Unit.
At a post-surgery meeting, Murray speaks of how he is worried about damaging his hip again and needing further surgery if he goes back to playing tennis.
“What if I said, if you went back to playing first-class tennis, I think you’ve got a 15% chance that in the first seven years you could destroy the hip,” she tells him.
Murray laughs nervously.
“That is what it is like, it’s not it will or it won’t. It is chances. For seven years of tennis would you take that risk?”
Murray initially doubted whether he would return to the court because he said he was happy with being pain free and given a new lease of life.
But his mum Judy correctly predicts that will change.
“My gut is telling me he has unfinished business. He’s not fooling me,” she says.
He watched a gruesome video of the hip surgery
No holds are barred when it comes to seeing the footage from Murray’s two hip surgeries.
Early in the film, we see graphic images of his operation with Australian surgeon John O’Donnell in January 2018 and Murray assessing his post-op scar which he concludes looks “pretty neat”.
Later, after deciding in January this year he wanted to have the hip resurfaced, we see him watching a gory video of someone else having that operation.
“I find that funny, that they’re literally using a hammer,” he says.
Shortly after, he is having the operation for real. Everything from the moment he lies down on the surgical bed – including graphic images of bloody instruments working on the joint inside gaping flesh – is captured by the camera.
“It’s not a good idea to be running around a tennis court,” Murray says dryly as he comes around from the operation.
Wife Kim, along with fitness coach Matt Little and physio Annum, joke that the remark must be captured by the filmmaker because they know he will change his mind – again.
He has a bromance with his physio
Murray’s ‘bromance’ with Annum provides the lighter, and funniest, moments of the film.
“I’d love to marry Shane, I’d have so much fun,” says Murray.
Annum says Murray likes to tap into his weakness – being “gullible” – with his other physio Mark Bender saying he views the pair as an “old couple that know exactly what buttons to push”.
The pair’s relationship is again captured while they are starting Murray’s rehabilitation work after the second hip operation, a warm and funny scene where Murray shows his affection for the physio.
“The brilliant thing about having a sore hip is I can hug Shane and he can’t get away from me because otherwise he will hurt my hip. He can’t force his way out of my hug,” he laughs.
These exchanges show Murray’s sharp sense of humour and how he like to “wind up” his team. Bender also bears the brunt of Murray’s cheeky humour as we learn his nickname is ‘Slender’.
“It’s ironic because he’s not particularly slender,” giggles Murray.
He used to feel there was animosity towards him
Murray’s announcement at the Australian Open that an illustrious career seemed to be heading towards the end brought a universal showing of affection and respect towards him.
But it has not been until recent years – following Wimbledon, Olympic and Davis Cup triumphs which endeared him further to the British public – that he has felt it.
“He did used to feel there was a certain amount of animosity towards him,” his wife Kim says.
“I think he would accept now there is a lot of love out there. What he has done, I have to pinch myself sometimes. I can’t believe I’ve watched it happen.”
With Rafael Nadal falling flat on his back on the baseline, his triumphant team-mates running on court to pile on top of him and a partisan home stadium rocking with pride, it was a familiar scene as Spain lifted the Davis Cup.
Yet, while the celebrations were similar to many we have seen in previous years, the host nation’s first success since 2011 came at the end of a very different week in Madrid.
Unlike in the past, Spain’s victory over Canada was not the only Davis Cup tie to take place in November as the tournament culminated. Instead it was the end of an 18-nation finals self-styled as the ‘World Cup of Tennis’.
The football-style knockout tournament, a bold concept conceived and financially backed by Barcelona defender Gerard Pique and his Kosmos investment group, faced a barrage of criticism before it had even started.
And, as with any new event, especially one of such size and stature, there were teething problems in the Spanish capital.
But there were also many memorable moments in what proved to be a high-quality tournament on the court.
Here, BBC Sport analyses what worked in the new-look finals, what perhaps didn’t and the lessons that must be learned before next year’s event.
The star names sprinkle stardust on the new finals
For years, the common consensus had been the 119-year competition needed to change.
Top players, worried about burn out on the punishing ATP Tour, were regularly not turning out to play in a 16-team world group that saw home and away ties spread over four weekends throughout the year.
Pique, a tennis fan said to have been a promising junior player, was the catalyst for change.
But his intervention, and the changing of a tradition which had existed in the previous format since 1981, was not welcomed by tennis die-hards, including the most recognisable player on the planet.
Swiss great Roger Federer resisted the change and urged that the competition should not become the “Pique Cup”.
While the 20-time Grand Slam champion was not present in Madrid after Switzerland failed to qualify three of the other ‘Big Four’ did play.
Rafael Nadal, Novak Djokovic and Andy Murray were the star names present as 11 of the world’s top 20 singles players also appeared at the event. Russian world number four Daniil Medvedev and German world number seven Alexander Zverev were the only members of the world’s top 10 who pulled out in spite of their nations qualifying.
The presence of so many key players was seen as an encouraging sign by Pique and ITF chief David Haggerty.
“When we started a few years ago with the project of the new format, what we wanted basically was that the top players participate in the competition. I think that was a fact,” Pique said.
“You saw here the top players playing and representing their countries.”
Whether that will continue to be the case largely depends if a merger with January’s 24-nation ATP Cup – created by the men’s tour and attracting all the top-ranked players except Federer – can ever be agreed to avoid a situation where two men’s team events take place within close proximity of each other.
Different format, same emotions stirred
Try telling those competing in Madrid – and their compatriots who had spent time and money travelling there – that the new format had devalued the competition as some suggested.
World number one Nadal tore around the Caja Magica as he won all eight of his singles and double rubbers to inspire the Spanish.
Novak Djokovic along with the entire Serbia team were left close to tears following a dramatic quarter-final loss to Russia. In an emotional news conference post match, Djokovic’s doubles partner Viktor Troicki – who played a woeful third-set tie-break – said he felt “the worst ever” after been given the chance to “be the hero, only for God to take it away”.
Former world number one Andy Murray was contorted with nervous emotion as he watched his older brother Jamie and Neal Skupski try to put their nation into the final by beating Nadal and Feliciano Lopez in a decisive doubles rubber.
And try telling Spain’s Roberto Bautista Agut, who was left in tears after winning his singles rubber against Canada three days after the death of his father, that representing his country was still not of significant pride and honour.
Fears the emotion could be sucked out of the competition proved wide of the mark, although it remains to be seen what a finals weekend without the host nation competing would look like.
Empty seats for most matches – give them to the kids?
Patriotism was not in short supply in the stands either.
Clearly that peaked during the Spanish ties where the Caja Magica stands were a sea of red-and-yellow flags as the partisan home crowd, encouraged to make noise by a jaunty brass band and a man barking out instructions through a football terrace-style megaphone, willed their team towards a first Davis Cup triumph since 2011.
That understandably gave those matches a flavour of the ‘old’ Davis Cup – and an advantage to Spain.
While some other teams were well backed – notably Great Britain, Canada and Kazakhstan, thanks to the help of their national federation – other matches were played out in half-full arenas.
Even Saturday’s first semi-final between Canada and Russia saw huge swathes of empty red seats.
The Lawn Tennis Association (LTA) offered 875 free tickets to British fans for the semi-final against Spain – at a cost of about £60,000 – and British captain Leon Smith thinks there should be an arrangement between organisers and the governing bodies of all 18 finalists to subside support in the future.
“The most important thing about Davis Cup is obviously trying to maintain the atmosphere,” he said.
“Why doesn’t that become the norm that there’s X amount of investment given to each federation to get a core group of fans?”
Spain’s two group games and Sunday’s final were the only ties to officially sell out the 12,500 capacity Manolo Santana court, according to the tournament’s online ticket portal.
“That would have been a good idea and would have exposed young kids – the future of the sport as potential players and fans – to tennis.”
A second venue in Madrid would prevent 4am finishes
While Spanish custom dictates the nation generally stays awake until the early hours, a major problem which arose was ridiculously late finishes in some matches with ties outlasting all but the most nocturnal of fans.
The group tie between the United States and Italy was the most startling, eye-rubbing example, finally ending at 04:04 local time to become the second latest finish in top-level tennis history behind Lleyton Hewitt’s win over Marcos Baghdatis at the 2008 Australian Open which ended at 4:33am.
“We expect that some games will be finished late, but obviously 4am was too late,” Pique said.
“That day all the games, they were very long.
“But we will have to be more creative in the future. I think this is not a big issue. It’s something we have to think how we do it.”
Britain’s Jamie Murray has suggested the finals should be split across two venues in Madrid next year, enabling one court to host one tie every day rather than two sessions.
When asked if the Spanish capital’s WiZink Center could be used next year, or where a fourth court could be built at the Caja Mágica, Pique said both options “are right now are on the table”.
Too focused on TV fans and not those there?
Between 800 and 1,000 British fans roared their team on in each of their four matches, with some staying for the whole week in the hope of seeing the 2015 champions end victorious again.
The majority of supporters appeared to savour the sense of occasion that mixing with fans from all over the world brought, although a large portion still bemoaned the loss of the previous home-and-away format.
“It is a fantastic atmosphere, we’ve talked to people from loads of different countries,” said Pam Flatman, who flew over from Norfolk with husband Wayne and their friend Mac Boreham. “It brings people together and from that perspective it’s a good thing.”
One common gripe among fans of all nationalities was they felt the tournament was more geared towards the needs of armchair fans than those actually in Madrid.
“There are no screens dotted around, so there is no information from the other matches,” said Mac. “At Wimbledon you know what’s happening but here you know nothing.”
Pam added: “Scoreboards and TVs outside in the concourses are necessary – and more outside heaters because the Madrid winter can be very chilly. It’s been freezing standing out here.”
The tournament also ended with a tinge of disappointment for fans at the venue. Spain lifted the trophy with many supporters having already left the arena, unwilling to sit through an unnecessarily elaborate and time-consuming setting up of the presentation stage.
Those trying keeping up-to-date with the action from afar reported a series of issues.
Technological glitches surfaced on the official Davis Cup finals information channels – including website, mobile app and stadium televisions – which ranged from comical errors to more serious issues of fan engagement.
While British number one Dan Evans’ profile featuring a faceless image instead of a photograph like everyone else was not the end of the world, nor was Germany’s team page describing Zverev – absent and a harsh vocal critic – as the ‘star of the their team’, the fundamental ability to update scores and competing players correctly was a failure.
Often, the scores of matches were wrong and slow to update, while Britain were apparently represented by Argentine Guido Pella in their quarter-final against Germany.
Selling television rights proved to be a problem in some major markets, with the tournament not shown on a major American broadcaster and only being available to British television audience at a late stage when Eurosport stepped in to secure the rights.
Another peculiarity was the decision to set up new Twitter and Instagram accounts under the ‘Davis Cup finals’ banner rather than use the existing Davis Cup accounts which have a combined 500,000 followers.
Although the behind-the-scenes content was excellent – fun, interactive and engaging – and retweeted by the main Davis Cup accounts in a bid to build the brand, the new accounts only had a combined 60,000 followers which leads a suspicion that reach was not as wide as it could have been.
“Our vision is to make sure this is seen in as many places by as many people and followed around the world. That’s something that, again, is something we can improve,” Pique added.
Britain’s five-man team of Andy Murray, Dan Evans, Kyle Edmund, Jamie Murray and Skupski reached the last four of the inaugural season-ending finals, which are the brainchild of Barcelona footballer Gerard Pique, to ensure an automatic spot in next year’s event.
Edmund, 24, was the star player for Britain, winning all three of his singles rubbers in straight sets, despite a disappointing ATP season where he has slipped to 69th in the world.
Andy Murray, 32, missed the last three matches after struggling for fitness during a sluggish three-set win over world number 179 Tallon Griekspoor in the opening victory over the Netherlands.
Evans, who won one of his four singles matches, is ranked as the British number one, while Jamie Murray and Skupski are continuing to improve as regular doubles partner.
Smith also pointed to Cameron Norrie and doubles player Joe Salisbury – Britain’s sole representative at the recent ATP Finals – to illustrate the depth at his disposal.
“Everyone’s got their different journey to go on, but I think we should be excited by what we have in British tennis,” said Smith, whose side also beat Kazakhstan and Germany.
“We’ve got so many different things going. I think it’s great, it’s positive.
“Hopefully everyone can just keep on that path and we come back here next year with an even stronger team than the strong team we have already got.”
Jamie Murray and Skupski, who had an impressive week on his Davis Cup debut, could not convert any of four second-set points against world singles number one Nadal, 32, and 38-year-old Lopez in Saturday’s semi-final.
The Spanish pair, roared on by a boisterous home crowd in the Caja Magica, swung the momentum back in their favour and converted a second match point to leave the British contingent devastated.
“The emotion is still raw,” Smith told BBC Sport.
“You’re within a couple of points of going into a deciding third set and then it’s game on. There was nothing in it. I’m proud of all of them.
“We’re hurting, but we’ve seen an amazing tie here against Spain, who are arguably the strongest team in the competition, especially with Rafa in it.
“We’ve pushed them within a couple of points to a deciding set to see who goes into the final.
“To reach semi-finals is a brilliant achievement, we have come through tough matches and tough moments.
“Everyone has stepped up and we’ll look back proudly on this.”