Nick Kyrgios has withdrawn from the United Cup on the eve of the inaugural edition of the tournament, with Australia team captain Samantha Stosur admitting "it's news to all of us."

The 2022 Wimbledon finalist, who has been struggling with an ankle injury, was due to line up alongside the likes of Alex De Minaur and Ajla Tomljanovic in the new team event.

However, Kyrgios surprised team-mates with his decision to pull out of the event, in which Australia face Great Britain in their opening match on Thursday, reportedly switching his focus to achieving full fitness for next month's Australian Open.

"I'm not going to speak for Nick’s summer, we've got to leave that for him," Stosur said at a press conference. "He was here. We literally just found out 10 minutes ago, so it's obviously news to all of us.

"But we just move forward now. We're all happy to be here and keen to get out there. Now that's out there, and we move forward with the placings of the team and do our best on the day.

"As far as the men's side of this team goes, we're in very capable hands still, so I'm not concerned that our chances have just diminished greatly or anything like that. We're out here to do everything we can possible to try and win this competition."

De Minaur added: "We've all just heard. Ultimately, we're just going to get ready. We’ve got a great team, and we're all going to be out there doing our best. So ultimately, the only thing that changes is match-ups and that's about it."

Nick Kyrgios has doubled down on the claim he will retire if he wins a grand slam next year, saying years of intensive travel have left him "exhausted".

Kyrgios enjoyed the best grand slam run of his career when he finished as runner-up to Novak Djokovic at Wimbledon this year, while he also reached the last eight at the US Open.

However, the Australian questioned his future in the sport earlier this week, telling reporters in Dubai: "Hopefully I can win a slam and just retire."

Speaking to Eurosport, the world number 22 insisted that remark was serious, saying his private life had suffered due to his time spent travelling to take part in ATP Tour events. 

Asked if he would really call time on his career in the event of winning a first major singles title, Kyrgios said: "Honestly, I probably would.

"Especially being from Australia as well, there's just so much travel, so much time away from family, so much time away from friends. 

"You're just missing milestones in the family, you're just not having a normal life, really. No other tennis player that's not from Australia gets that."

Kyrgios believes few athletes can match the sacrifices he has made in his career, citing the strain caused by spending long periods away from his home country. 

"It's easy for a European or an American player to lose or win a tournament, then you take a five-hour flight back home and you spend a week there before the next event," Kyrgios said.

"Whereas as an Australian, you're doing four- to seven-month travel blocks. Honestly, I don't think it's healthy. 

"No other real athlete does that in the world, in any sport, doing seven months on your own. 

"I'm exhausted honestly. It's just stressful. The more you win, the more success you have, the more demands you have off the court. People expect more from you. 

"People are like, 'why are you complaining about it?' It's not what they think. You're living out of a suitcase at hotels, it's not like you're on holiday. 

"You've got to go to tennis courts and train. The lifestyle is quite vigorous. If it happens, I probably would [retire], to be honest."

Kyrgios has only reached the last eight at the Australian Open on one occasion, and with the next edition of his home slam approaching, the 27-year-old is less than enthusiastic.

Asked if he will feel refreshed by the time the Melbourne major begins next month, Kyrgios said: "Probably not. There is a little bit of excitement, but it's probably 95 per cent stress, five per cent excitement, to be honest."

Nick Kyrgios is gunning for Tom Brady and LeBron James after he and fellow tennis star Naomi Osaka were unveiled as co-owners of a pickleball team.

Kyrgios has partnered with four-time grand slam champion Osaka in investing behind Miami PC, who will compete in next year's Major Pickleball League.

Pickleball, a growing sport that combines tennis, badminton and ping pong, has attracted a fleet of major admirers and investors from other professional sports, including NFL great Brady and NBA superstar James.

In an Instagram post, Kyrgios confirmed he would be partnering Osaka in Miami and vowed to defeat Brady and James, who have made investments of their own into franchises within the league.

Kevin Durant is another investor, signing up a new team, the Brooklyn Aces, while Kyrgios and Osaka have also been joined by Kansas City Chiefs quarterback Patrick Mahomes in Florida.

"Introducing the @miamipc," Kyrgios wrote. "Big welcome to our draft picks... We are coming for you @kingjames [LeBron] @easymoneysniper [Durant] @tombrady."

Former Germany international footballer Mesut Ozil is another name involved, with the ex-Arsenal man backing the D.C. Pickleball team.

Nick Kyrgios could "just retire" if he wins a grand slam in the upcoming 2023 season.

The Australian had one of his best years yet in 2022, winning three doubles titles and also collecting the Washington Open singles final in August.

However, Kyrgios fell short again at the season's grand slams despite reaching the Wimbledon final, where he was defeated by Novak Djokovic in four sets.

With the Australian Open, Kyrgios' home tournament and first grand slam of the year, less than a month away, the 27-year-old could call it quits should he win a maiden grand slam.

Speaking between matches at an exhibition event, Kyrgios told reporters: "Hopefully I can win a Slam and just retire.

"Would I sign again? Honestly, I don't know about it.

"It took a lot of hard work this [2022] season, a lot of discipline and it seems the better you do, everyone wants a bit more of you and it becomes more stressful.

"But I had a lot of fun this season. And I’m finally just proud to say I made a Slam final and started to meet some expectations. I had a lot of fun, I enjoyed it, definitely felt better off and on the court."

It is not the first time Kyrgios has suggested an early retirement, having stated in October he will "probably not" play past the age of 30.

Nick Kyrgios hit out at a lack of respect for his achievements in Australian tennis, after Ash Barty claimed the Newcombe Medal.

Three-time grand slam winner Barty made the surprise decision to retire in March, aged just 25, after securing the Australian Open title only two months earlier.

The former world number one was subsequently recognised with the highest individual honour in Australian tennis as she won her fifth consecutive Newcombe Medal on Monday.

Kyrgios, who won the Australian Open doubles title with Thanasi Kokkinakis, became the first male Australian finalist at Wimbledon since Mark Philippoussis (2003) in July, but fell to defeat against Novak Djokovic.

The 27-year-old, then 40th in the world, was also the lowest-ranked grand slam male finalist since Marcos Baghdatis (54) at the Australian Open in 2006.

After the announcement of Barty's individual recognition, Kyrgios took to Instagram to question the decision.

"LOL. No respect at all. Don't give a f***," he wrote before including a comparison of his 2022 victories to Barty's year.

It is not the first time Kyrgios has spoken out against Australian tennis, previously suggesting it was an "easy decision" to snub the Davis Cup to play at the Diriyah Tennis Cup exhibition event in Riyadh.

Kyrgios may take some consolation, though, after being named with Kokkinakis as the Fans' Favourite doubles team in the 2022 ATP Awards.

He responded to the announcement on Instagram, adding: "Obviously lol."

Nick Kyrgios will play the French Open for the first time since 2017 next year because his partner wants to visit Paris, though he would prefer to stay at home.

Kyrgios has never been beyond the third round at Roland Garros, last appearing at the event in 2017 – when he suffered a second-round defeat against Kevin Anderson.

Last year, the Australian labelled the French Open "the worst grand slam" and called for the competition to be "taken off the calendar altogether".

However, Kyrgios now says he will end his absence from the Paris event, though his reasons for doing so are not tennis related.

"My girlfriend wants to know Paris, so I'm going to play at Roland Garros 2023," Kyrgios told reporters in Saudi Arabia.

"It will be good for me to earn some more money, although I would have preferred to stay at home.

"I know I can do great results on clay. I beat Roger [Federer], [Stan] Wawrinka, I played a final in Estoril. My girl wants to get to know the city so I will have to go this year."

Kyrgios achieved two of his four best grand slam runs in 2022, losing the Wimbledon final to Novak Djokovic before exiting the US Open at the quarter-final stage against Karen Khachanov.  

Nick Kyrgios admits the pressure he is facing is "a lot to handle", as he prepares for next month's Australian Open.

Having started 2022 with a doubles title with Thanasi Kokkinakis at his home grand slam, Kyrgios then advanced to the final of Wimbledon and suffered defeat at the hands of Novak Djokovic.

That form, which also saw him reach the quarter-finals at the US Open, has put the 27-year-old in the conversation as a title contender for the 2023 grand slams, the first of which begins in Melbourne on January 16.

Kyrgios is aware there are great expectations for him in the year ahead and conceded it is not easy being in the spotlight, particularly ahead of his home grand slam.

"I always believe that pressure is a privilege. In real life, there's not much pressure to being a professional tennis player," he told Eurosport.

"We earn great money, we travel around the world with our favourite people. We get to see different people, different cultures.

"In the scheme of things, that's not pressure but I completely understand going on the match court with all this expectation that 'Nick Kyrgios is legitimate chance to win a grand slam now'.

"There's a lot of pressure there, especially having the Australian Open and everyone in Australia expecting big things from me. It's a lot to handle sometimes. Being in the spotlight is not easy."

The last Australian man to win a singles grand slam title was Lleyton Hewitt in 2002 at Wimbledon, while the wait for men's success at home goes back further to 1976 – when Mark Edmondson was victorious in Melbourne.

While there is a desire for Kyrgios to end those lengthy waits, he has made it clear he wants the success for his own goals, not for anyone else.

"I've learnt that the people will never have enough. For me, I've achieved some great things in this sport and where I came from," he said.

"I know I'm content with myself. I want to achieve more for myself, but for all of my team, not for anyone else."

Nick Kyrgios made an "easy" decision to snub participation in the Davis Cup with Australia but take up the chance to earn a seven-figure sum in Saudi Arabia.

The 27-year-old is competing at the Diriyah Tennis Cup exhibition event in Riyadh, with the three-day, 12-man event coming with a prize of $1million for the winner.

Davis Cup captain Lleyton Hewitt and Australia number one Alex de Minaur have both revealed they tried to persuade Kyrgios to compete in Malaga last month, with their attempts ultimately being in vain.

The Wimbledon finalist referenced the negativity he has endured in his career from his homeland as a reason for his snub, saying participation in the Davis Cup "doesn't really make sense".

Australia ended up finishing as runners-up to Canada.

"Maybe if Australia embraced me a little bit more, I would play it and bring home the trophy. But who knows? At this point of my career, I'll always do what's best for me," Kyrgios told AAP News.

"I can travel around the world playing exhibitions around this time of year for six figures - you know I feel I put myself in that position - so it's an easy one for me.

"I'll easily take time with my family and my girlfriend and enjoy experiences around the world and earn that type of money rather than play a week away in something where I wouldn't be able to be with my girlfriend and I'm not getting paid that well.

"[That] doesn't really make sense to me and my progression as an athlete."

Asked whether he could envisage himself playing in the Davis Cup again, he added: "Maybe, who knows?

"Adding another week in Europe in Malaga wasn't really what was on my wish list. If it was in Australia, maybe it would have been a different story. But who knows?

"It's not always easy for me to erase everything in Australia that's said negatively about me or my family, you don't need that - so it's interesting that they really want me to play, but are always criticising.

"Look, I've always been one of the best players in the world - I’ve always held up my fair share of the bargain towards Australia. 

"I feel like this is the first year I've earned respect when it should have been given when I first came on tour.

"I've represented them, put them on the map, and having produced one of the most successful male years in the last decade for Australia, and am only just getting embraced [now] - I don't think that's my fault."

Roger Federer believes the intense tennis tour schedule can have a negative impact on the mental health of players.

Federer, now retired, won 20 grand slam titles between 2003 and 2018 before stepping away from the sport in September of this year, and he is well aware of the challenges players face.

A number of big-name stars have spoken out about their mental health, including Naomi Osaka and Nick Kyrgios, and Federer feels the packed tennis calendar does not help players.

"When players retire at a super young age, I totally understand it," Federer told a press conference in Tokyo. "The tour is tough... travel, practice, jetlag.

"Nobody is allowed to say, 'Oh, I'm tired today', because it looks like you're weak, and that's why players end up having sometimes mental problems.

"You're supposed to show strength. But we're also not machines, we’re also just human beings."

Federer played on the tour for 25 years before calling it a day, and he is making the most of being able to finally relax, saying: "As a tennis player you're always thinking about your next practice, your next match. It never lets you go.

"I don't think I was that much aware of it, how much that thought is always there, and it rides with you, until you retire and then you realise that stress all drops away."

He pointed to doping tests, and the fact players must constantly make authorities away of their whereabouts.

"We have to fill out the doping forms every single day, one hour during the day, where you are," Federer said. "You're always aware in the back of your head, they could be coming any moment, especially in that hour.

"Once that all drops away you actually feel quite lighter, relieved that you can actually live normally again after 25 years."

Rafael Nadal and Nick Kyrgios could face off in the inaugural United Cup, while WTA world number one Iga Swiatek will represent Poland.

The United Cup is the new warm-up tournament for the ATP and WTA Tour seasons, and will take place in Australia in December and January.

While ATP world number one Carlos Alcaraz will not feature, compatriot Nadal will be competing for Spain, and they have been drawn alongside Australia and Great Britain in Group D.

Those matches will be played in Perth, with a clash between Nadal and Kyrgios, who have enjoyed an entertaining rivalry down the years, in the offing.

They were set to meet in the semi-finals at Wimbledon this year, but Nadal withdrew due to injury, handing Kyrgios a walkover into his first grand slam final, which he lost to Novak Djokovic, who will not be playing in Australia.

Serbia are not among the batch of teams taking part, but even so, there remains doubt whether Djokovic would be able to enter Australia given his stance against the COVID-19 vaccine, which eventually saw him deported from the country after a drawn-out legal battle ahead of this year's Australian Open.

Emma Raducanu has decided against playing for the British team, which also does not feature Andy Murray.

Casper Ruud, the beaten US Open finalist, will play for Norway in Group E, in Brisbane, while Alexander Zverev will be in action for Germany.

Swiatek is the biggest name from the WTA Tour to enter, with the brilliant 21-year-old lining up alongside Hubert Hurkacz for Poland in Group B.

Maria Sakkari and Stefanos Tsitsipas, along with his brother Petros, will team up for Greece in Group A.

Two more countries will be admitted to the tournament later in November.

Novak Djokovic set up a semi-final meeting with Daniil Medvedev at the Astana Open on Friday, cruising past Karen Khachanov in the last eight.

Djokovic complemented a fine display of serving by converting three of his five break points in a 6-4 6-3 victory, recording his seventh consecutive win following his absence from the US Open.

The 21-time grand slam champion has now reached six semi-finals this year, but saw room for improvement in his performance after beating the world number 18.

"I didn't play as well from the baseline as I did in the first two matches, but still it was enough," Djokovic said. "I managed to produce some good tennis when it was most needed in both sets."

Looking ahead to his final-four match, the Serb added: "I always expect highs from myself. Hopefully I can elevate still the level of my game for tomorrow, because it's going to be needed." 

Djokovic will face an 11th tour-level meeting with Medvedev in the next round after his fellow former world number one recorded a dominant 6-1 6-1 win over Roberto Bautista Agut.

On the other side of the draw, third seed Stefanos Tsitsipas beat Hubert Hurkacz 7-6 (10-8) 6-3, and will now face Andrey Rublev after he eased to a 6-1 6-2 win over Adrian Mannarino.

At the Japan Open, a knee injury forced Wimbledon runner-up Nick Kyrgios to withdraw from his meeting with Taylor Fritz, with the American set to take on Denis Shapovalov in the semi-finals.

Seventh seed Shapovalov saw off Borna Coric 6-4 6-3 to reach the final four, while fourth seed Frances Tiafoe advanced with a 6-0 6-4 win against Miomir Kecmanovic.

South Korea's Kwon Soon-woo claimed the final place in the semi-finals in Tokyo, beating Spain's Pedro Martinez 6-3 6-0

Carlos Alcaraz was dumped out of the Astana Open in the first round on Tuesday, suffering a surprise 7-5 6-3 defeat to David Goffin.

Goffin entered the draw as a lucky loser after squandering two match points to lose his final qualification match against Luca Nardi on Sunday, but he produced a fine display to see off the world number one in one hour and 46 minutes. 

The Belgian had to rediscover his composure to take the opener after throwing away a 5-2 lead, but ultimately deserved his straight-sets win over the US Open champion. 

Speaking on court after his victory, Goffin said: "I always believe that I have the level to cause some trouble against those guys. 

"When you play against the world number one on a big stage, big crowd, the fire inside gives you so much power to play your best tennis because you don't have any choice."

Stefanos Tsitsipas was the only other seed in action in Kazakhstan on Tuesday, and he advanced to the round of 16 by beating home favourite Mikhail Kukushkin 6-3 6-4.

The Tokyo Open also lost its top seed, as Casper Ruud fell to a 6-3 6-3 loss to Jaume Munar, who claimed his first top-10 win since beating Alexander Zverev in 2019.

But the likes of Borna Coric and Nick Kyrgios fared better, claiming straight-sets wins over Thanasi Kokkinakis and Tseng Chun-hsin, respectively.

Wimbledon runner-up Kyrgios only dropped four further points on his serve after being forced to save a break point in his opening service game, racing to a dominant 6-3 6-1 win.

Elsewhere, eighth seed Dan Evans fought back to beat Radu Albot 6-7 (3-7) 6-1 6-4, and Alex de Minaur lost 6-3 6-2 to Kwon Soon-woo. 

Nick Kyrgios' lawyers will apply for the tennis star's assault charge to be dismissed on mental health grounds, an Australian court was told on Tuesday.

Kyrgios was charged in July of this year in relation to the alleged assault of a former partner in January 2021.

The 27-year-old, who has enjoyed a fine season in 2022, reaching the final of Wimbledon and the last eight at the US Open, was not present for a hearing in Canberra on Tuesday, as he features in the Japan Open.

Michael Kukulies-Smith, who is representing Kyrgios, asked for the case to be adjourned so forensic mental health reports could be prepared.

The case was duly adjourned to February 3, 2023 by magistrate Glenn Theakston. It is then expected Kyrgios' legal representatives will apply to have the case dismissed, with Kukulies-Smith stating he was making the application having reviewed Kyrgios' "medical history since 2015, including public disclosures of his mental health struggles".

Australian law dictates that magistrates have the power to dismiss a charge if they believe an accused person is mentally impaired, and that dealing with a charge in such a manner would be of benefit to both the defendant and the community.

Kyrgios could face two years in prison should he be handed a maximum sentence.

Novak Djokovic does not regret missing out on the US Open due to his vaccination stance and is waiting to discover if he will be allowed to compete in the 2022 Australian Open.

The 21-time grand slam winner missed two of this year's four majors owing to his decision to not be vaccinated against COVID-19.

Though Djokovic was able to extend his record at Wimbledon, he lost joint control of the outright Open Era title for most men's single majors to Rafael Nadal, after the latter won in Australia and then at the French Open.

Carlos Alcaraz, meanwhile, won a maiden grand slam to become the new world number one with victory at Flushing Meadows earlier this month.

Djokovic was barred from entering the USA on vaccination grounds, but speaking ahead of this week's Laver Cup, the Serbian says he does not rue his choice.

"No, I don't have any regrets," he said. "I mean, I do feel sad that I wasn't able to play but that was a decision that I made, and I knew what the consequences would be. I accepted them and that's it."

Djokovic was quick to hail teenager Alcaraz, congratulating the Spaniard for his victory, and adding: "He did it in an incredible fashion. He's 19 years old and already the number one in the world.

"I think he's a great addition to our sport, a great star in the making. We can't speak about him as the future because he is already the present."

Djokovic's 2022 started in less than auspicious circumstances when, having been granted an exception to compete in Australia despite the nation's strict COVID-19 protocols, he was subsequently deported.

Questions over whether he would even be allowed back in the country remain up in the air, but the Serbian is hopeful of a reprieve.

"I'm waiting for the news," he added. "It's really not in my hands right now. So I'm hoping I can get some positive news soon."

Nick Kyrgios claims all tournaments other than grand slams are a "waste of time" following his US Open quarter-final exit to Karen Khachanov on Tuesday.

The in-form 2022 Wimbledon runner-up's run at Flushing Meadows, which included knocking out defending champion Daniil Medvedev, was ended by Khachanov 7-5 4-6 7-5 6-7 (3-7) 6-4.

Kyrgios had been in career-best form, winning more matches than any other player on the ATP Tour since his Wimbledon final defeat to Novak Djokovic, but will need to wait until January for another crack at a major, at his home Australian Open.

The 27-year-old has spoken about his renewed level of focus since reaching the Wimbledon final and said he was "devastated" by his US Open loss, smashing a racquet after the match.

"I honestly feel like s***," he said. "I feel like I've let so many people down.

"I feel like these four tournaments are the only ones that are ever going to matter. It's just like you got to start it all again. I have to wait until the Australian Open. It's just devastating. It's heart-breaking.

"I don't even really care about any other tournament. I feel like at the grand slams, now having success at a grand slam, it's just like no other tournament really matters.

"It's like you get better, you get worse, then at a grand slam none of it matters. You either win or lose. People don't really care if you got better on the day or you lost 6-4 in the fifth or played one of the best matches of the tournament. You lost.

"That's all people remember at a grand slam, whether you win or you lose. I think pretty much every other tournament during the year is a waste of time really. You should just run up and show up at a grand slam. That's what you're remembered by."

Kyrgios allayed concerns over a knee injury at the end of the first set that he said settled, stating that he started "flat" and felt Khachanov's serve was too good, particularly in key moments.

"All credit to Karen, he's a fighter. He's a warrior," he said.

"I thought he served really good today. Honestly probably the best server I played this tournament, to be honest, the way he was hitting his spots under pressure."

The triumph marks 29th seed Khachanov's first major semi-final having fallen in the quarter-finals at majors twice previously.

"It's like one more step forward," the Russian said. "I'm really, really happy I could do it.

"I had to face and to beat Nick, who is playing some of the best tennis again. It obviously was a tough match to approach. I made my first semi-final, so it's pretty simple in my head. I'm just really happy."