Ash Barty stunned the sporting world on Wednesday by announcing her retirement from tennis, bowing out as the top-ranked player in the women's game.

The popular 25-year-old has not featured since winning her home grand slam at the Australian Open in January, becoming the first female Aussie singles champion of the tournament since Chris O'Neil in 1978.

Announcing the news on her Instagram page, Barty cited achieving a lifelong goal of winning Wimbledon last year as a primary factor behind her decision as well as being "spent physically".

But Barty is by no means the first sporting hero to retire at the top of their game. Below we take a look at some other examples of those who have exited as champions.

ALAIN PROST

The 1993 Formula One season was largely dominated by one man – Williams driver Alain Prost. The Frenchman had to battle hard with the iconic Ayrton Senna at the start of the campaign, with them each taking three wins from the first six races of the season. However, a run of four straight victories for Prost were followed by a string of retirements for Senna, ensuring a fourth world title that provided the ideal ending to a glittering career.

ALEX FERGUSON

One of the most successful managers in world football, Alex Ferguson began a 27-year stint at Manchester United after an excellent spell at Aberdeen. The Scot won 28 major trophies at Old Trafford, including 13 Premier League titles, five FA Cups and two Champions Leagues. His final trophy came with top-flight glory in 2012-13, and 17 days later he brought the curtain down.

PEYTON MANNING

Considered one of the greatest quarterbacks of all time, Peyton Manning won his first Super Bowl with the Indianapolis Colts in 2007 and, after an injury-blighted season that raised doubts about his ability aged 39, he added a second with the Denver Broncos in 2016, bowing out on the ultimate high.

RICHIE MCCAW, DAN CARTER

New Zealand became the first nation to successfully defend the Rugby World Cup trophy by beating Australia 34-17 in the final at Twickenham in 2015, adding to their success on home soil four years prior. It proved the end of the line for captain Richie McCaw, who was at the time the most capped player in rugby union with 148 appearances for the All Blacks, as well as mercurial fly-half Dan Carter. Ma'a Nonu, Conrad Smith and Kevin Mealamu were also among an influential contingent that opted to end their international careers.

PETE SAMPRAS

In defeating Andre Agassi in the final of the 2002 US Open, the same opponent he overcame to win his first grand slam 12 years prior, Pete Sampras secured his place among the greats in men's tennis. It was a then-record 14th major singles title for a male player for the American, a milestone that has since been surpassed by Roger Federer, Rafael Nadal and Novak Djokovic, but he did not compete again and announced his retirement almost one year later.

PHILIPP LAHM, MIROSLAV KLOSE

At 31 you still have a number of years ahead of you in football. However, after lifting the World Cup trophy with Germany in 2014, Philipp Lahm decided to call time on his international career and focus on club football with Bayern Munich. The versatile full-back made 113 appearances for his country and was joined by fellow centurions Per Mertesacker and Miroslav Klose – whose tally of 71 international strikes is a German record – in switching focus to domestic matters.

MARION BARTOLI

A first grand slam at Wimbledon in 2013 appeared to be the breakthrough moment for a 28-year-old Marion Bartoli, but reality proved very different. The Frenchwoman defeated Sabine Lisicki – who had overcome pre-tournament favourites Serena Williams and Agnieszka Radwanska – in the All England Club final, but announced her retirement during the Western and Southern Open just 40 days later due to persistent injuries. She attempted a comeback in 2018 but continued setbacks and injuries curtailed those plans.

NICO ROSBERG

Nico Rosberg had engaged in several intense battles with Lewis Hamilton before finally getting the better of his Mercedes team-mate to become Formula One world champion in the 2016 season. Still only 31, Rosberg had potentially several more years in F1 but the German instead opted to depart having reached the pinnacle of his sport.

The Grand Slam Board has announced that first-to-10 tie-breaks will conclude the final sets of all four majors with immediate effect.

Starting with May's French Open, the decision is being adopted on a trial basis with the aim of providing "greater consistency" to the rules when matches go the distance.

Prior to Wednesday's announcement, the French Open, Australian Open, US Open and Wimbledon each had their own rules when games went to a deciding tie-break.

The Australian Open is the only grand slam to already employ the first-to-10 rule at 6-6.

Wimbledon previously played first-to-seven at 12-12, while the US Open played a first-to-seven at 6-6.

There has not previously been a deciding tie-break at Roland-Garros, with all matches continuing until a player secured a two-game lead in the decider.

A statement released on behalf of Grand Slam Board members Jayne Hrdlicka, Gilles Moretton, Ian Hewitt and Mike McNulty confirmed the changes.

It read: "The Grand Slam Board's decision is based on a strong desire to create greater consistency in the rules of the game at the Grand Slams, and thus enhance the experience for the players and fans alike.

"This trial, which has been approved by the rules of the tennis committee governed by the ITF, will apply to all Grand Slams across qualifying, men's singles and doubles, women's singles and doubles, wheelchair and junior events in singles, and will commence at the 2022 edition of Roland-Garros."

The rule change will be reviewed after a full Grand Slam year and will remain in place should it be deemed a success.

The tweaks to the current format will ensure no repeat of John Isner's marathon battle with Nicolas Mahut at Wimbledon in 2010, which the American edged 70-68 in the final set of their first-round match.

The ATP, WTA, International Tennis Federation (ITF) and the four grand slam organisers have announced the Tennis Plays for Peace campaign.

Along with the campaign, which will include efforts on social media and at tournaments, each of the seven organisations has pledged to donate $100,000 to humanitarian relief efforts in Ukraine.

Russia invaded the country on February 24 and the conflict is still ongoing. Well over one million refugees are estimated to have fled to neighbouring countries in Europe.

A joint statement from tennis' governing bodies on Tuesday explained that the campaign is not just about donations.

"The seven bodies will also signal support via their social and digital platforms by prominently featuring the Ukraine ribbon icon, with everyone in the tennis ecosystem encouraged to use the hashtag #TennisPlaysforPeace," it read.

"In addition, physical ribbons will be distributed for ATP and WTA players to wear at the upcoming BNP Paribas Open tournament in Indian Wells."

Last week, the ITF banned Russian and Belarusian teams from competing at the Davis Cup or the Billie Jean King Cup. Russia are the holders of each title.

The ATP and WTA, meanwhile, allowed Russian and Belarusian athletes to carry on competing, but only under neutral banners.

That includes ATP world number one Daniil Medvedev and WTA world number three Aryna Sabalenka.

New world number one Daniil Medvedev says Friday's Mexican Open semi-final against Rafael Nadal is his "chance to get my revenge" after last month's epic Australian Open defeat.

Medvedev progressed to the final four in Acapulco on Thursday with a routine 6-2 6-3 victory over Yoshihito Nishioka, while Nadal triumphed 6-0 7-6 (7-5) over Tommy Paul to set up their semi-final meeting.

The Russian's win capped a fine day after Novak Djokovic's loss to Jiri Vesely at the Dubai Tennis Championships meant he would next week become the new world number one for the first time in his career.

Before then, however, Medvedev must take on Nadal in Acapulco, with the pair having not faced off since last month's epic Australian Open decider, where the Spanish fought back from two set downs to clinch a record-breaking 21st major title.

"It’s always special to play against him,” Medvedev said following his win over Nishioka. “Kind of a chance to get my revenge.

“I have to learn from the best, which is him, Roger [Federer], Novak [Djokovic], Andy [Murray]. Always when they were losing a tough fight, they were trying to get their revenge. Sometimes they managed to do it, sometimes not. That’s what I’m going to try to do if I play Rafa."

Medvedev revealed he did not realise that Djokovic's loss would mean he would become number one until he started receiving congratulatory messages on Thursday.

"It’s not easy to play a match when you get this news during the day," Medvedev said.

"The first goal for me was to still win today because I’m here to try to win every match I play. But it’s definitely some great news."

Nadal was full of praise for the new world number one, admitting his excitement at their re-match.

The Spaniard prevailed in five hours and 28 minutes over Medvedev in Melbourne, winning 2-6 6-7 (5-7) 6-4 6-4 7-5 and was ready for the re-match.

"Everybody knows how difficult it is to play against Daniil," Nadal said after Thursday's win over Paul.

"I know I have to play at my highest level if I want to have any chance, and that's what I'm going to try. I have to play my game.

"Everybody knows how difficult the final was in Australia. Tomorrow is going to be another battle.

"I know he's playing well, plenty of confidence... I am excited to play that match."

Novak Djokovic welcomed the "positive" reception he has received from his fellow players, after making his first appearance since missing the Australian Open.

Djokovic, whose decision not to be vaccinated against COVID-19 caused him to be deported from Australia on the eve of the year's first grand slam, eased to a 6-3 6-3 win over Lorenzo Musetti in just 74 minutes at the Dubai Tennis Championships.

Djokovic spoke publicly about his vaccination status for the first time in a BBC interview last week, while rival Andy Murray, who has spoken about his support for vaccination on numerous occasions, said that he "didn't like seeing" Djokovic's ordeal in Australia after his own win in Dubai.

Serbia's 20-time Grand Slam winner says that most of his fellow professionals have been supportive upon his return to action.

"So far here most of the players that I’ve seen – I haven’t seen too many players – but most of the players that I've seen have been positive and welcoming", he said after his round-of-32 win.

"It's nice to see, obviously. I can't say that was the case in Australia. It was a little bit strange. But here, it's gone well so far."

The 34-year-old impressed against Musetti, serving five aces, winning 71 per cent of his second serves (17 out of 24) and saving each of the seven break points he faced during his first outing of the year, and Djokovic was also pleased with the reception he received from the fans in Dubai, as well as with his performance. 

"I couldn't ask for a better reception," he added.

"It's been a while since I played, and I couldn't think of a better place to kick-start the season. Thank you for the reception and for welcoming me on court the way you did.

World number one Novak Djokovic has praised Rafael Nadal for his "incredible" triumph by winning last month's Australian Open after his own deportation forced him to miss the event.

Nadal moved beyond Djokovic with his record-breaking 21st Grand Slam title in Melbourne with a five-set victory over Daniil Medvedev in the final.

Djokovic was unable to compete in Melbourne due to his vaccination status, deported amid an ugly saga after arriving in Melbourne expecting to be permitted to play.

The Serbian, who returned to the ATP Tour on Monday with a 6-3 6-3 win over Lorenzo Musetti at the Dubai Tennis Championships, was gracious in praising Nadal, who had a nagging foot injury dog him late last year.

"I think it was four, five months ago that he was on the crutches and now he's winning a slam. It's incredible," Djokovic told reporters after beating Musetti.

"I've got tons of respect for him. I don't want to take anything away from his victory, me not participating in the tournament regardless."

The Serbian was pressed on missing the Australian Open and added: "Of course, it wasn't a pleasant feeling for me leaving the country the way I did and watching the tournament from far away."

Djokovic will play either Karen Khachanov or Alex de Minaur in the second round in Dubai, while Nadal is competing at the Mexican Open, with a match against Denis Kudla on Tuesday.

World number one Novak Djokovic has praised Rafael Nadal for his "incredible" triumph by winning last month's Australian Open after his own deportation forced him to miss the event.

Nadal moved beyond Djokovic with his record-breaking 21st Grand Slam title in Melbourne with a five-set victory over Daniil Medvedev in the final.

Djokovic was unable to compete in Melbourne due to his vaccination status, deported amid an ugly saga after arriving in Melbourne expecting to be permitted to play.

The Serbian, who returned to the ATP Tour on Monday with a 6-3 6-3 win over Lorenzo Musetti at the Dubai Tennis Championships, was gracious in praising Nadal, who had a nagging foot injury dog him late last year.

"I think it was four, five months ago that he was on the crutches and now he's winning a slam. It's incredible," Djokovic told reporters after beating Musetti.

"I've got tons of respect for him. I don't want to take anything away from his victory, me not participating in the tournament regardless."

The Serbian was pressed on missing the Australian Open and added: "Of course, it wasn't a pleasant feeling for me leaving the country the way I did and watching the tournament from far away."

Djokovic will play either Karen Khachanov or Alex de Minaur in the second round in Dubai, while Nadal is competing at the Mexican Open, with a match against Denis Kudla on Tuesday.

World number one Novak Djokovic has praised Rafael Nadal for his "incredible" triumph by winning last month's Australian Open after his own deportation forced him to miss the event.

Nadal moved beyond Djokovic with his record-breaking 21st Grand Slam title in Melbourne with a five-set victory over Daniil Medvedev in the final.

Djokovic was unable to compete in Melbourne due to his vaccination status, deported amid an ugly saga after arriving in Melbourne expecting to be permitted to play.

The Serbian, who returned to the ATP Tour on Monday with a 6-3 6-3 win over Lorenzo Musetti at the Dubai Tennis Championships, was gracious in praising Nadal, who had a nagging foot injury dog him late last year.

"I think it was four, five months ago that he was on the crutches and now he's winning a slam. It's incredible," Djokovic told reporters after beating Musetti.

"I've got tons of respect for him. I don't want to take anything away from his victory, me not participating in the tournament regardless."

The Serbian was pressed on missing the Australian Open and added: "Of course, it wasn't a pleasant feeling for me leaving the country the way I did and watching the tournament from far away."

Djokovic will play either Karen Khachanov or Alex de Minaur in the second round in Dubai, while Nadal is competing at the Mexican Open, with a match against Denis Kudla on Tuesday.

Former world number one Andy Murray did not like how Novak Djokovic was treated in Australia but says the 20-time major winner must live with the consequences of his decisions.

Murray and Djokovic both progressed through the first round at the Dubai Tennis Championships on Monday.

The Serbian's 6-3 6-3 win over Lorenzo Musetti marked his first on the ATP Tour in 2022, coming in the wake of his deportation from Australia due to his vaccination status ahead of the first major of the calendar year.

It remains unclear if Djokovic will be permitted to compete at this year's other majors - the French Open, Wimbledon and the US Open - given he remains unvaccinated.

"Like I said at the time, I don't agree with his decision. I think it would be a lot easier for him, obviously, if he was to get vaccinated," Murray told reporters after beating Australian Christopher O'Connell 6-7 (4-7) 6-3 7-5 in Dubai.

"But I also didn't like seeing him in the situation that he was in Australia as someone that I respect and have known since I was a child. I didn't like seeing that.

"There is consequences to the decisions he's made just now. He obviously has to accept that. But I don't think it's great for tennis if our best player is not competing in the major events."

Djokovic admitted after his win over Musetti that, as it stands, he cannot enter the United States to compete at next month's prestigious Indian Wells Masters, let alone the US Open.

The world number one added that he was hopeful the situation may change "in the next few weeks".

Rafael Nadal would "welcome" seeing Novak Djokovic play at future grand slam tournaments if he is granted permission to do so unvaccinated against COVID-19.

World number one Djokovic has courted controversy for his views on being jabbed and was last month deported from Australia on the eve of the Australian Open.

Djokovic has confirmed he is willing to miss future slams after stating he was prioritising his right to choose what to put into his body above his sporting ambitions.

In Djokovic's absence, Nadal became Australian Open champion and now has 21 titles – the most for a male player.

Nadal believes that any further omissions from Djokovic would only be harmful to the Serbian's chances of history not the slams themselves, but he would have no issue with his rival playing in the sport's biggest tournaments.

Speaking ahead of his return to the ATP Tour in Acapulco, Nadal said: "It will affect Novak's [grand slam] history if he can't play.

"It will affect him, not the grand slams themselves. Whoever wins the most slams – it will be what it will be. Everyone takes their own decisions and must live with them.

"In that sense, hopefully the pandemic subsides and we stop having so many deaths around the world and this horror ends, and we can return to normality – not for Novak but for the world in general.

"There are many people that have suffered, but if Novak can play the grand slams unvaccinated, then he is welcome."

Nadal defeated Daniil Medvedev in an epic Melbourne showpiece to become the first man to 21 slams, but he says the achievement has not changed his life.

"Absolutely nothing has changed having 21 slams, I won't lie to you," he added.

"From 20 to 21 there is not a very large difference. Life goes on exactly the same. The only thing that has changed is that now I play tennis, which a few months ago I couldn't.

"I am very happy for everything that happened in Australia, it was very unexpected, especially before the tournament started. In my life, nothing has changed. No title is going to change what is important in my life, which are other things.

"Already, at 35 years old, I have a lot of experiences behind me, of successes and bad moments and these sensations already help me to live in a more calm and different way."

Novak Djokovic says he will play at whatever tournament will have him as he gears up to make his return to the ATP Tour.

The men's world number one has not played a competitive match since early December and was last month deported from Australia on the eve of the Australian Open.

That decision was a result of Djokovic opting not to join the majority of his tennis peers in getting vaccinated against COVID-19 and amid controversy over how he handled getting the virus himself in December.

Speaking to the BBC in a recent interview, Djokovic stated he was prioritising his right to choose what to put into his body above his sporting ambitions and confirmed he is willing to miss further grand slams if necessary.

With COVID restrictions still in place in many countries, Djokovic acknowledges his options to play are limited.

"I just have to follow the rules. You know, whatever tournament that I'm able to play, I will be trying to get to that country and play the tournament," Djokovic said ahead of facing Lorenzo Musetti in round one of the Dubai Tennis Championships.

"Obviously, I'm not intending to play the full schedule and that wasn't also my intention, as you brought it up and my goal prior to this season or the season before, and I was trying to aim to play my best at the grand slams and some of the 1000 events we have, of course, and playing for my country, those were the biggest motivations that I had in terms of the scheduling. 

"Right now, the situation is obviously different for me. So, I really can't choose right now. It's really about where I can go and play. So, wherever I have an opportunity, I'll be using probably that opportunity and going to play because this is what I do, it's what I love to do still. 

"And I have support from my family and my team is still there with me and that's what's important for me because obviously it was not easy for anyone in my surroundings to go through these kinds of circumstances and situations that we have been through.

"But it's very exciting to have everyone together here with me. And in Dubai, we're back on the tour and then we'll play this tournament and we'll see how it goes further down the line."

Several stars backed the decision for Djokovic to be barred from playing in Melbourne, with most noting that he had not followed the rules in order to do so.

But the Serbian says he has been received warmly ahead of his return to the ATP Tour.

"I haven't seen too many players, but the players that I've seen have been positive and welcoming," he added.

"And it's nice to see obviously. I can't say that was the case in Australia. It was a little bit strange, but here it's well so far."

Novak Djokovic has said missing grand slams including the French Open and Wimbledon will be "the price I am willing to pay" for resisting the COVID-19 vaccine.

Last month, the world number one and 20-time grand slam winner was deported from Australia on the eve of the Australian Open after his entry visa to the country was cancelled.

That stemmed from Djokovic refusing to join the overwhelming majority of fellow tennis stars in being vaccinated against coronavirus, and amid controversy over how he handled getting the virus himself in December.

In a new interview with the BBC, Djokovic said he was prioritising his right to choose what to put into his body above his sporting ambitions.

The 34-year-old Serbian declared his stance is likely to keep him sidelined for "most of the tournaments" at present.

Djokovic is set to make his return to the court at the Dubai Duty Free Tennis Championships later this month, with vaccination not a requirement. He has been included on the entry list for next month's Indian Wells Open, but that is a tournament he may have to sit out.

He confirmed in the BBC interview that he has still yet to be vaccinated, though did not entirely rule out the prospect in the future.

"I have not," he said. "I understand and support fully the freedom to choose whether you want to get vaccinated or not."

Prior to entering Australia, where he was obliged to confirm his status, it was only widely assumed that Djokovic had not been inoculated.

Now he is keen to "speak up ... and justify certain things", adding: "So I was never against vaccination. I understand that globally everyone is trying to put a big effort into handling this virus and seeing hopefully an end soon to this virus.

"And vaccinations are probably the biggest effort that was made on behalf of the planet. I fully respect that, but I've always represented and always supported the freedom to choose what you put into your body. For me that is essential. It's really the principle of understanding what is right and what is wrong for you.

"And me, as an elite professional athlete, I've always carefully reviewed and assessed everything that comes in, from the supplements, food, the water that I drink or sports drinks. Anything really that comes into my body as a fuel.

"Based on all the information that I got, I decided not to take the vaccine as of today. I keep my mind open because we are all trying to find collectively a best possible solution to end COVID. Nobody really wants to be in this kind of situation that we've been in collectively for two years."

Djokovic is the reigning French Open and Wimbledon champion and, after Rafael Nadal's Australian Open triumph, he has been bumped down to joint second on the all-time men's grand slam list. Missing majors at this stage of his career could be a crushing blow to Djokovic's hopes of finishing top of that pile.

"I'm part of a very global sport that is played every single week in a different location, so I understand the consequences of my decision, and one of the consequences of my decision was not going to Australia, and I was prepared not to go," Djokovic said.

"I understand that not being vaccinated today I am unable to travel to most of the tournaments at the moment. That is the price I am willing to pay."

He looked to disassociate himself from the anti-vax community by saying he had "never said I am part of that movement" and declaring that was a "wrong conclusion" to draw.

At the same time, Djokovic concurred when asked if he was willing to sacrifice the chance to be seen as the greatest player of all time, and to travel to Roland Garros and the All England Club this year.

"Because the principles of decision-making on my body are more important than any title or anything else. I'm trying to be in tune with my body as much as I possibly can," Djokovic said.

"I say that everyone has a right to choose to act or say whatever they feel is appropriate for them."

Rafael Nadal is motivated to win more grand slams than rivals Roger Federer and Novak Djokovic come the end of the trio's careers, but he believes he will need more than 21 to achieve that.

Spaniard Nadal sealed a record 21st grand slam title on Sunday at the Australian Open, beating Daniil Medvedev 2-6 6-7 (5-7) 6-4 6-4 7-5 in a marathon five hours and 24 minutes.

It was only the second Australian Open title of Nadal's decorated career and put him out ahead of Djokovic and Federer (both 20) as the man to have won the most grand slams of all time.

Nadal worried his career was over just a matter of weeks ago as he struggled to recover from the foot injury that has affected a large part of his career.

He abandoned a stop-start 2021 season in August and missed Wimbledon, the Olympics and the US Open, leaving many to wonder if Nadal would ever be a force at the top level again.

Now, the 35-year-old is the man to beat once more, although he suspects he will need to add more major titles to his name to ensure he is ahead of his two great rivals when their careers are over.

"A short time ago I would have accepted just being able to just play tennis and not to win any more grand slams, but now I have 21," he told a media conference. 

"My way of seeing it doesn't change. I want to be the one with more grand slams at the end of the careers of the three of us, because nowadays it is the three of us. Yes, I would like that, but I am not obsessed by it and it does not frustrate me that I might not be the one. 

"Honestly, I don't think that 21 will be enough to end up being who has more grand slams, but the future will tell what will happen. Again, I feel fortunate in this life.

"All three of us have won more than we could have dreamed when we were kids. I understand the debate of who is the best, and it feeds the fans, but I don't think about it like that. As always, I try to do it my way and not focus on others.

"I follow my way and if that allows me to have options to fight in order to have more moments like the ones I've just had, it will be welcome. I will fight for it and I hope to keep having chances if my physical condition allows me."

Nadal's focus now turns to the Indian Wells Masters, which starts on March 10, with it appearing unlikely he will play in Acapulco a fortnight earlier. 

"My first priority is to try to analyse how I am after the Australian Open," he added. "I need a few days and then I will analyse things with calm and clarity. 

"For Indian Wells, I would say I have the maximum determination to go if there isn't any setbacks. For Acapulco, I would like to be there but I have to make a smart choice. The perspective has changed and I do have to take decisions according to what my body allows me."

Rafael Nadal remains adamant he is not playing the numbers game as he navigates the twilight years of his career, but a record 21st grand slam title still felt "very special" to the Spaniard.

As he put it himself, what was perhaps the most unexpected major of his career was also one of the most emotional.

"That means everything for me," said Nadal, after the 35-year-old wrestled with Daniil Medvedev for five hours and 24 minutes on Rod Laver Arena, roaring back from two sets adrift to earn a 2-6 6-7 (5-7) 6-4 6-4 7-5 epic victory.

Nadal worried his career was over just a matter of weeks ago, he said, as he struggled to recover from the foot injury that has affected a large part of his career.

He abandoned a stop-start 2021 season in August, and missed Wimbledon, the Olympics and the US Open, leaving many to wonder if Nadal would ever be a force at the top level again.

At the age of 35, he is suddenly the man to beat again, having moved ahead of Novak Djokovic and Roger Federer on the list of the most successful men's singles players in grand slam history.

They both have 20, and Nadal now has 21.

Federer, who at the age of 40 is battling to return from knee trouble, hailed Nadal as "a great champion" and "an inspiration", while Djokovic saluted an "amazing achievement".

If their social media posts came through gritted teeth, both would surely appreciate the resilience of their great Spanish rival, not just in this match but across his career. In turn, Nadal says he would have no qualms finishing behind either when their final career totals are totted up.

"I don't want to change my point of view, honestly," said Nadal, who began his post-final news conference at 02:42 on Monday morning in Melbourne.

"For me it's amazing to achieve another grand slam at this moment of my career. It just means a lot to me. Of course, I know it's a special number, 21. I know what it means. It's a big significance this title."

Nadal says what matters most is the enjoyment of the big moments, rather than whether he finishes first, second or third in the private rivalry he, Federer and Djokovic have been ducking out for years.

"Today is an unforgettable day," he said. "For the last six months, I really fought a lot to try to be back on court. There have been very, very tough moments and conversations, because you don't know if I'm going to have the chance to be back on the tour.

"I feel honoured. I feel lucky to achieve one more very special thing in my tennis career. I don't care much if I am the one or not the one or the best of history, not the best of the history.

"Honestly, today I don't care much. For me, it's about enjoying nights like today. That means everything for me."

This was Nadal's second Australian Open title, a full 13 years since he beat Federer in another five-set duel.

"It is the most unexpected, without a doubt," Nadal said. "And the most surprising I think for everyone. It has been a very emotional night. Even now I am destroyed, honestly, physically."

He said he was too tried to celebrate, his body having taken a thrashing. In December, Nadal tested positive for COVID-19, adding a further complication before heading to Melbourne.

A warm-up event title put Nadal in a positive mindset heading into the Australian Open, but how the foot would hold up remained to be seen.

He said the injury is "difficult to fix, impossible really", but for now it is manageable. At one point during his recovery he said there had been "zero success" in getting to grips with the problem, saying it was "heartbreaking" at times.

"I just want to enjoy this moment," he said, back on top of the world, "and, of course, try to keep going."

Rafael Nadal was on the brink of another Australian Open final defeat before a remarkable turnaround against Daniil Medvedev.

Trailing by two sets to love, Nadal found himself staring at three break points midway through the third set on Rod Laver Arena.

But he recovered and stepped up his game, clinching a record-breaking 21st grand slam title with a 2-6 6-7 (5-7) 6-4 6-4 7-5 victory over Medvedev in an enthralling encounter that lasted five hours and 24 minutes.

Medvedev had his chances, but the US Open champion suffered his third defeat in four major finals.

Stats Perform looks at some of the key moments.

Nadal serving at 2-6 6-7 (5-7) 2-3

Medvedev looked on his way to a deserved and resounding win when Nadal – who had lost four Australian Open finals previously – found himself in a 0-40 hole.

But a drop shot winner from Nadal was followed by a long Medvedev backhand, with the Russian trying a drop shot that the Spaniard returned too well on his final break point chance. It would prove a decisive hold for Nadal.

"Yeah, that was a good moment when I had the triple break point," Medvedev said afterwards. "Actually, I don't remember all of them in detail, but I remember that all of three returns I made it in. I just got a little bit tight. But, again, that's tennis. I should have done better. I should have hit a winner. I maybe would have won the match.

"Tactically nothing changed. I feel like I was playing right. But Rafa stepped up. The only thing that physically was a little bit up and down, and yeah, he was I think stronger than me physically today. Starting from the third set, there were some shots and points where I was a little bit on the back foot, let's call it like this. And Rafa takes control of these moments.

"But again, yeah, I have to work harder."

Medvedev serving at 6-2 7-6 (7-5) 4-4

The vocal and enthusiastic crowd was beginning to impact Medvedev, and Nadal's level was improving.

A long forehand at 15-15 was followed by an inexplicable overhead drop shot attempt by Medvedev that hit the net, leading to sarcastic clapping of the crowd.

Nadal clinched the break with a wonderful backhand winner down the line.

Medvedev serving at 6-2 7-6 (7-5) 4-6 2-2

Medvedev had already recovered from being a break down in the fourth set when Nadal struck again after a lengthy fifth game.

An excellent return saw Medvedev net a backhand and Nadal converted his seventh break point of the game with a backhand cross-court passing shot winner.

Medvedev serving at 6-2 7-6 (7-5) 4-6 4-6 5-5

Medvedev had stopped Nadal's momentum in the previous game when the Spaniard was attempting to serve out the match.

But Nadal broke again when Medvedev pulled a backhand wide before sending a forehand long.

Nadal serving at 2-6 6-7 (5-7) 6-4 6-4 6-5

Nadal was never going to let a second chance go begging.

Medvedev put a running forehand into the net and a backhand return long before an ace from Nadal set up three championship points.

He only needed one, making a backhand volley to become the first player in the Open Era to win an Australian Open final from two sets to love down.