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."

Karen Khachanov reached a grand slam semi-final for the first time as he ended Nick Kyrgios' US Open run in a five-set three-and-a-half-hour epic on Tuesday evening.

The 27th-seeded Russian, who had fallen in the quarters at the 2019 French Open and 2021 Wimbledon Championships, prevailed 7-5 4-6 7-5 6-7 (3-7) 6-4 over the Australian 23rd seed to set up a semi-final date with fifth seed Casper Ruud.

The result ended the run of Kyrgios who had won the most matches on the ATP Tour since losing July's Wimbledon final to Novak Djokovic. Kyrgios had taken out reigning champion and top seed Daniil Medvedev in the fourth round.

The 26-year-old Russian broke Kyrgios' serve in the 12th game of the first set with an exquisite lob clinching the frame where the Australian's second serve let him down.

Kyrgios responded to win the second set, despite a medical timeout for treatment on his left leg after exclaiming "I can't walk", breaking the Russian early and hitting 12-5 winners.

Khachanov claimed the third set in similar circumstances to the first, with Kyrgios failing to hold his serve in the 12th game, this time producing unforced errors in the key moments.

The two players traded breaks early in the fourth set but Kyrgios would force a fifth set after a dominant tie-break where he converted his second set point.

The Russian got an early break in the fifth set, while Kyrgios failed to convert break points in Khachanov's next two service games and he would not recover.

Data Slam: Khachanov cool under pressure

Little split these two players in an extremely tight quarter-final, with 31-30 aces edged by Kyrgios, but many of Khachanov's came at crucial moments under pressure.

Kyrgios' flamboyance and shot-making ability was on show, but his inability to convert break points, along with 58 unforced errors, ultimately proved the difference, taking two of nine.

ACES/DOUBLE FAULTS

Kyrgios – 31/5
Khachanov – 30/3

WINNERS/UNFORCED ERRORS

Kyrgios – 75/58
Khachanov – 62/31

BREAK POINTS WON

Kyrgios – 2/9
Khachanov – 4/8

Karen Khachanov reached a grand slam semi-final for the first time as he ended Nick Kyrgios' US Open run in a five-set three-and-a-half-hour epic on Tuesday evening.

The 27th-seeded Russian, who had fallen in the quarters at the 2019 French Open and 2021 Wimbledon Championships, prevailed 7-5 4-6 7-5 6-7 (3-7) 6-4 over the Australian 23rd seed.

The result ended the run of Kyrgios who had won the most matches on the ATP Tour since losing July's Wimbledon final to Novak Djokovic. Kyrgios had taken out reigning champion and top seed Daniil Medvedev in the fourth round.

The 26-year-old Russian broke Kyrgios' serve in the 12th game of the first set with an exquisite lob clinching the frame where the Australian's second serve let him down.

Kyrgios responded to win the second set, despite a medical timeout for treatment on his left leg after exclaiming "I can't walk", breaking the Russian early and hitting 12-5 winners.

Khachanov claimed the third set in similar circumstances to the first, with Kyrgios failing to hold his serve in the 12th game, this time producing unforced errors in the key moments.

The two players traded breaks early in the fourth set but Kyrgios would force a fifth set after a dominant tie-break where he converted his second set point.

The Russian got an early break in the fifth set, while Kyrgios failed to convert break points in Khachanov's next two service games and he would not recover.

Data Slam: Khachanov cool under pressure

Little split these two players in an extremely tight quarter-final, with 31-30 aces edged by Kyrgios, but many of Khachanov's came at crucial moments under pressure.

Kyrgios' flamboyance and shot-making ability was on show, but his inability to convert break points, along with 58 unforced errors, ultimately proved the difference, taking two of nine.

ACES/DOUBLE FAULTS

Kyrgios – 31/5
Khachanov – 30/3

WINNERS/UNFORCED ERRORS

Kyrgios – 75/58
Khachanov – 62/31

BREAK POINTS WON

Kyrgios – 2/9
Khachanov – 4/8

Daniil Medvedev knows he has not performed to the best of his abilities at grand slams this season after his US Open title defence was ended by Nick Kyrgios.

Medvedev, who will also concede his spot at the top of the ATP's world rankings, has only won one of the four finals he has reached in 2022.

His record in the majors is a particular frustration for the 26-year-old. After losing to Rafael Nadal in the Australian Open final, Medvedev has reached the fourth round at Roland Garros and the same stage at Flushing Meadows, while The All England Club's ban on Russian and Belarusian athletes prevented him from competing at Wimbledon.

With Novak Djokovic unable to play in New York due to his COVID-19 vaccination status, Nadal, Carlos Alcaraz or Casper Ruud will become the world number one after the US Open's conclusion on Sunday.

"I mean, now that you say it, I remember it," Medvedev said in a press conference when asked how it felt to give up the number one spot.

"That's not nice because honestly after such a match, when you lose in a grand slam... I'm trying to look good here, but I'm disappointed.

"[I'm] not going to cry in the room, but I'm a little bit disappointed. For a few days I'm going to be just a little bit sad, looking at my phone, my laptop or watching some series.

"Yeah, it was not the first thing on my mind walking after the match, saying, 'Damn, I will not be the world number one anymore' – I actually don't know which place I will be. Probably three or four. I guess Carlos will pass me. I don't know actually.

"But that's motivation, try to do better. Obviously it was the last slam of the year. I didn't do well enough. Didn't win in Australia when I had the chance. Didn't get the chance to play at Wimbledon.

"Roland Garros, lost in the fourth round. Here, fourth round. Yeah, I should do better, should get more points if I want to be world number one again."

Medvedev went down 7-6 (13-11) 3-6 6-3 6-2 to Kyrgios, who has a 4-1 winning record against the Russian.

Asked if he thought it was Wimbledon finalist Kyrgios' best display against him, Medvedev suggested the Australian came close to replicating the form of greats Nadal and Djokovic.

"Yeah, it was a high-level match," he said. "[I] played Novak, Rafa. They all play amazing. Nick played kind of their level, in my opinion.

"He has a little bit different game because he's not a grinder in a way, [but] at the same time he can rally. He's tough to play.

"He has an amazing serve. He plays well, has every shot. It was a really high-level match from him.

"If he plays like this until the end of the tournament, he has all the chances to win it, but he's going to get tough opponents."

Nick Kyrgios took the opportunity to discuss the low points of his career after his victory over Daniil Medvedev, admitting he never thought he would have the chance to return to his best form.

Kyrgios conceded just one set to Medvedev in the 7-6 (13-11) 3-6 6-3 6-2 triumph at the US Open on Sunday.

It appeared during the first set tiebreaker that he was on the verge of one of his famous meltdowns, with a couple of racket slams and plenty of abuse towards his own box, but he steadied and fought back after a poor second frame.

Speaking to the media after the match, Kyrgios admitted the tiebreaker was do-or-die, saying: "I feel like if he'd got that first set, it was going to be pretty much an impossible task for me to come back and win."

This year's Wimbledon runner-up was humble and respectful when discussing the talent of Medvedev, and despite his muted celebration, highlighted what a big deal it is for him to perform well under the bright lights in New York.

"I didn't over-celebrate. It's only the fourth round, I've got quarter-finals [next]," Kyrgios said. "But it was an amazing experience obviously taking down the number one player in the world on Arthur Ashe Stadium.

"I don't really like to celebrate too much after that because I know that if I played him nine more times, he's probably getting on top of me the majority of the time.

"I hadn't won a match on Ashe before this week, now I've won two against two quality opponents, and I feel like I've been able to showcase [my talent].

"There's a lot of celebrities here, a lot of important people here watching. I wanted to get on that court and show them I am able to put my head down and play and win these big matches.

"For the tennis world I think it's important as well. People were really starting to doubt my ability to pull out matches like this at majors. I'm really proud of myself honestly because it hasn't been easy dealing with all the criticism."

Kyrgios continued to discuss how he feels he is perceived by the public and the media, saying it was more a feeling of relief than ecstasy when he finished the job.

"I feel like I'm more just proud of the way that I've bounced back after everything, honestly," he said. "I've been in some really tough situations mentally, and in some really scary places.

"Obviously if you look at it on paper, I probably wasn't expected to win that match. Maybe take a set or two if I'm lucky, give the people a show.

"It's a great win, but I come off the court and I'm just almost relieved that it's over because there's just so much pressure every time I go out on court, so much expectation, so much unpredictability of what I can do.

"I just sit there in the locker room after and I'm just super proud of the performance, because there was really a time where I didn't think I was capable of producing and doing this any more.

"I guess I'm just more relieved, and I'm super proud."

Nick Kyrgios is through to the quarter-final after a terrific 7-6 (11-13) 3-6 6-3 6-2 win over world number one and reigning US Open champion Daniil Medvedev.

It was a match that had all of the usual Kyrgios antics as he seemed to lose his cool during the first set tiebreaker, slamming his racket multiple times while repeatedly yelling at members of his entourage.

But he was able to work his way through it, saving three set points, before sealing the opening frame in 64 minutes with his fourth set point. Kyrgios relied on his dominant serve and limiting his errors, with just one double fault and 11 unforced errors with 21 winners.

The momentum from winning the set kept Kyrgios from spiralling mentally, but he became sloppy in the second, committing four double faults with only three aces, and he had 12 unforced errors with seven winners. It was the only set he had more than one double fault and more unforced errors than winners.

Zverev's ability to return in the second set was the difference, lifting his return point success rate from 33 per cent in the opener to 48 per cent to break twice and even up the match.

It had all the makings of a Kyrgios meltdown, but where he would usually begin to unravel and force desperate power shots to shorten points, he instead settled into the battle and refocused on getting into the net.

After only going to the net five times in the second set, he tripled that in the third, winning nine-of-15 attempts while not allowing a single break point opportunity. Kyrgios only created one break point chance for himself, and he took it with both hands to go up two sets to one.

In the fourth, Kyrgios was able to break again with his first opportunity early on, and with his serve switched on and firing he would only allow one chance for Zverev to break back, but he snuffed it out before going on to secure a second break and the victory.

Of their five career meetings, Kyrgios has now won four, and he will now get the benefit of the number one seed's path through the tournament. Next up, he will face 27th seed Karen Khachanov in the quarter-final as he searches for his first career grand slam title.

Data Slam: Kyrgios accomplishes feat not seen since 1987

Kyrgios is the first player since 1987 to defeat the world number one twice in the same year, with Australian compatriot Pat Cash the last to do it.

It is also the first time an Australian has defeated a world number one in a grand slam since Kyrgios himself, back in 2014 as a 19-year-old against Rafael Nadal at Wimbledon.

ACES/DOUBLE FAULTS

Kyrgios – 21/7

Medvedev – 22/2

WINNERS/UNFORCED ERRORS

Kyrgios – 53/38

Medvedev – 49/19

BREAK POINTS WON

Kyrgios – 5/7

Medvedev – 3/8

Nick Kyrgios believes no other player will be able to emulate the career Serena Williams has enjoyed, after the grand slam great confirmed her retirement.

Williams went down 7-5 6-7 (4-7) 6-1 to Ajla Tomljanovic – Kyrgios' former partner – on Friday in the third round of the US Open.

That brought an end to her playing career, though the 40-year-old suggested she would leave the door open for a potential return.

Kyrgios, who defeated J.J. Wolf to set up a contest with reigning men's champion Daniil Medvedev, is in awe of what Williams has achieved, as he ranked the 23-time grand slam champion alongside Rafael Nadal, Roger Federer and Novak Djokovic.

"She's had a career that I don’t think no one else will emulate," Kyrgios said.

"You've got a couple on the men’s side who are trying to catch her in grand slams, but Nadal, Serena, Federer, Novak, these are once in a generation athletes – I wouldn't even put myself in the same category, ever.

"It's a special moment for her, she played extremely well, she won two matches and nearly got on top [against Tomljanovic], it's a hell of a way to go out.

"I just appreciate what she's done and I'm sure everyone in this building does as well."

After beating Wu Yibing, world number one Medvedev said of Williams: "That was a crazy match, it was close to being three hours.

"It's definitely a pity that she lost. If it's the last match of her career, it was definitely an amazing match and she was really close to winning.

"Ajla played at a great level, it was not easy against the crowd and it was a high-level match."

Williams bows out with the most grand slam wins in the Open Era of any player, male or female.

Daniil Medvedev has described both himself and US Open fourth-round opponent Nick Kyrgios as "electric", but says the pair share more "respect" than friendship.

The world number one will continue his men's single title defence against the Australian in the last 16 at Flushing Meadows after a 6-4 6-2 6-2 Win over China's Wu Yibing.

The pair are set to meet for the fifth time on the ATP Tour, with Kyrgios holding an impressive 3-1 record over the Russian in their previous four encounters, including in the final of the 2019 Citi Open.

But Medvedev defeated the former on home turf at the Australian Open earlier this year, in arguably the biggest clash between the duo.

Speaking ahead of the pair's encounter, Medvedev stressed he does not see the pair as friends, but he has strong admiration for his opponent's game and is impressed at how he has revived his fortunes this year.

"I don't think we are friends," he added. "I feel like we respect each other a lot. We are both quite electric. You never know what's going to happen in the future

"Nick is a little bit different from other tennis players on the court. That's his choice. That's his life. I'm not the one to judge. I feel a lot of respect for him."

Asked if he is surprised at Kyrgios' improved form following a first grand slam final this year at Wimbledon, Medvedev added: "To be honest, yes.

"We all knew that he's capable of doing big things. We always knew on [his] day, he is capable of beating anyone.He [has] proved it many times, against the biggest players in the world."

Kyrgios, meanwhile, is relishing another battle on a big occasion, adding that his attempts to seize victory against the odds of public opinion allow him to "thrive".

"You want to be in those moments," he said. "I want to be playing on the biggest stadiums in the world in front of millions of people broadcasted globally. That's where I want to be. That is why I work hard.

"It makes it even sweeter. I know a lot of people don't want me to succeed. I know a lot of people hate my game, the way I do things, the way I go about it. I always thrive on it. I never want to forget all the things people say.

"I always carry this chip on my shoulder. Win or lose, I'm proud of how far I've come. I think that's where every tennis player wants to be, playing the best players in the world in the best stadiums in the world."