Nick Kyrgios is ready to do "everything I can do get back to my best" after undergoing knee surgery.

Last year's Wimbledon runner-up was left "devastated" when he had to withdraw from the Australian Open.

Kyrgios was ruled out of his home grand slam after an MRI scan on his knee revealed a cyst as a result of a small lateral meniscus tear.

The world number 21 on Monday revealed he had gone under the knife and is looking forward to starting out on the road to recovery.

He posted on Instagram: "Surgery complete. I'll be doing everything I can do get back to my best. To the real ones checking in and sending the vibes…. I love you."

Kyrgios won the seventh ATP Tour singles title of his career in Washington last August and claimed the Australian Open men's doubles title with Thanasi Kokkinakis in his homeland 12 months ago.

The 27-year-old was beaten by Novak Djokovic in his maiden major singles final at the All England Club last July.

For the first time since 2005, the United States will be represented by three players in the men's singles quarter-finals of a grand slam.

Tommy Paul's win over world number 25 Roberto Bautista Agut on Monday ensured his place in the last eight, where he will face compatriot Ben Shelton.

With Sebastian Korda, who defeated Daniil Medvedev in round three, ticking off another top-10 opponent in the form of Hubert Hurkacz, the USA has three male players in the last eight of a major for the first time since the 2005 US Open, when Robby Ginepri, Andre Agassi and James Blake reached the quarters.

It is the first time the USA has had three representatives in the Australian Open quarter-finals since 2000, when Agassi, Pete Sampras and Chris Woodruff made it that far.

While Korda will face Karen Khachanov for a place in the semi-finals, Paul will go head-to-head with Shelton, the world number 89.

Shelton is the lowest-ranked American player to reach a major quarter-final in over 22 years, since Todd Martin at the US Open in 2000, and the lowest-ranked American to get so far in Melbourne since Michael Chang in 1996.

The 20-year-old has already beaten one compatriot, having defeated J.J. Wolff in a five-set thriller in his last match.

Meanwhile, it is the first time since 2006 that no Spanish male players will feature in the quarter-finals at the Australian Open.

Novak Djokovic charged into the quarter-finals of the Australian Open with a straight-sets demolition of Alex de Minaur.

The nine-time champion was outstanding on Rod Laver Arena, starting the second week with a ruthless 6-2 6-1 6-2 victory over Australian De Minaur.

There were no signs of a hamstring injury that Djokovic has been nursing, other than strapping on his left leg, as he booked a last-eight meeting with Andrey Rublev.

The tournament favourite, going for a record-equalling 22nd grand slam title, did not face a break point as he sealed a dominant victory in just two hours and six minutes at Melbourne Park on Monday.

An aggressive Djokovic took complete control after De Minaur was broken to love when he netted to go 4-2 down, the Serb wrapping up the first set when his opponent overcooked a forehand.

The fourth seed won nine games in a row in a one-sided second set, producing an exhibition of returning with pinpoint accuracy off both wings and serving superbly.

Djokovic was relentless, the depth of his groundstrokes enabled him to dictate rallies, and the 35-year-old produced a huge second serve followed by a backhand winner to go two sets up in just an hour and 15 minutes.

The Belgrade native was in no mood to hang around, breaking in the first game of the third set by racing to return a De Minaur drop shot and going a double break up in a flash.

De Minaur had no answer to the brilliance of Djokovic and although he was able to get on the board at 4-1, he was heading for the exit after sending a vicious serve high and wide.

Djokovic closing in on Agassi record

This was Djokovic's best performance of the tournament as he ominously marched into his 13th Australian Open quarter-final and the last eight of a major for the 54th time. 

Djokovic has 25 Australian Open wins in a row, the joint-second longest run and one behind Andre Agassi's record streak of 26, and was also his 86th main draw win at the Australian Open, his joint-highest tally in a single ATP-level tournament (level with Wimbledon).

WINNERS/UNFORCED ERRORS

Djokovic – 26/27
De Minaur – 9/28

ACES/DOUBLE FAULTS

Djokovic – 4/3
De Minaur – 3/2

BREAK POINTS WON

Djokovic – 6/12
De Minaur – 0/0

Magda Linette revealed "emotional management" has been key to her best grand slam singles run after upsetting Caroline Garcia to move into the Australian Open quarter-finals.

The unseeded Pole beat fourth seed Garcia 7-6 (7-3) 6-4 on Rod Laver Arena on Monday to move into the last eight for the first time.

Linette had never been beyond the third round of a major before this tournament, but she will face Karolina Pliskova for a place in the semi-finals.

The world number 45 will celebrate her 31st birthday next month and feels she is benefitting from being more mature after breaking new ground in her 30th main-draw appearance at a grand slam.

She said: "We worked a lot actually about my emotional management. I think dealing with some kind of losses, but not necessarily match losses, just even throughout the match losses, like small mistakes here and there.

"I think I've never really dealt with them very well. They carried over later on for next point, then another one. It was taking me just too long to get over them.

"I think of course we work so much on my game. We worked a lot on changing the directions and the depth of the ball.

"But I think this approach of really trying to look a little bit different, grow up a little bit emotionally, like that was a big thing for us as a team. All of us approached it. It wasn't only me, but it was the coaches that brought this to me."

Asked how she works on emotional control, Linette added: "I think it's just how do you try to approach the defeats and the mistakes, and are you making the right mistakes, can you then recognise it and move on and deal with them a little bit better. I think I was just getting too negative and too harsh on myself because I feel I'm quite demanding.

"On the other hand when you try to go to that other spectrum, when you're okay with everything, it's also not the best. You really need to stay on top of things and be proactive with it, which ones you're doing good and not.

"I think recognising it, you try again and again and again. Eventually you start recognising which ones were the right ones to deal with.

"It's very difficult. I'm [almost] 31 and I'm just getting it right, so obviously it was one of the toughest things for me. But I'm happy. I'm happy that I have this opportunity, that actually I tapped into something that finally I'm breaking something that you can't really measure it in any way. For me, it was something really difficult to change."

Aryna Sabalenka is hoping she can move to another level in a "new beginning" this year after beating Belinda Bencic to reach a first Australian Open quarter-final.

The fifth seed from Belarus saw off Bencic 7-5 6-2 on Rod Laver Arena on Monday and will face Donna Vekic in the last eight.

Sabalenka has not dropped a set in her four matches in the first grand slam of the year at Melbourne Park and has been installed as the favourite to take the title after Iga Swiatek's exit.

The 24-year-old played in a second successive US Open semi-final last year but has never made it is far as a championship match at a major.

Sabalenka won the Adelaide International 1 before heading to Melbourne and is optimistic she can kick on in 2023.

She said: "I want to believe that the way I'm working right now, the way I'm on the court right now, this is the new beginning, and this is the next step. So I really want to believe that it's going to really help me."

Sabalenka has endured struggles with her serve, but appears to have put that behind her after addressing the issue.

She added: "I worked a lot on my serve. I was keep trying, keep believing, keep changing. Then I worked on my, like, biomechanics.

"Basically that's it. But I was doing everything. I thought it's mentally, but it wasn't. We changed a lot of things on how we work on my serve. We tried to work more, less. We tried so many different things.

"In the end of the season when I start working with the biomechanics guy, he helped me a lot. I think from there, everything started to kind of get on that level."

Croatian Vekic ended 17-year-old Czech Linda Fruhvirtova's impressive run with a 6-2 1-6 6-3 victory.

Stefanos Tsitsipas wanted to keep the secrets of his late resurgence to himself after he finally saw off Jannik Sinner in five sets in the Australian Open fourth round.

The number three seed looked to be easing to victory when he claimed the first two sets, but Sinner fought back to force a decider.

Tsitsipas managed to rediscover his earlier form though to finally seal a 6-4 6-4 3-6 4-6 6-3 victory and book his place in the quarter-finals.

The Greek is the youngest player to reach three consecutive quarter-finals at the Australian Open since Novak Djokovic (from 2008 to 2010).

"It was all about getting myself relaxed and ready for the big battle in the fifth set," he explained at a press conference. "Of course, things weren't going my way after being two sets to love up. It seemed like the momentum switched dramatically, to me at least. There was a big gap that I couldn't fill in.

"But I made a few technical adjustments in the fifth, gave myself an opportunity to play a bit more loose. That really helped me serve better. I think I kept on moving. I kept on being active to be on these returns that I couldn't get in the previous sets."

Tsitsipas struggled on his own serve in particular, facing 26 break points in all, but his resilience saw him save 22 of them, and his dramatic improvement in the deciding set got him over the line when it appeared certain the Italian would become only the second player ever to come from two sets down to beat Tsitsipas at a grand slam (after Djokovic in the 2021 French Open final).

"There were some things, for sure, that I can look back to now and say that was not the best thing to do," the 24-year-old added. "I think it's also important to keep it to myself.

"We have certain things that we want to keep to ourselves and get back and improve. Not everything has to be public. Not everything has to be exposed and said.

"But it's a feeling. It's something that showed something different earlier in the match. And for some reason I decided not to follow or I give myself an idea that I can do things more extreme.

"That didn't seem to work at all. But the most important thing, I did fight. When I came to the most important part of the match, I regrouped and did it the way I did it in the first two sets."

Tsitsipas will face Czech 21-year-old Jiri Lehecka in the last eight.

Jiri Lehecka had not anticipated still being in the Australian Open at this point but his latest victory against a seeded player saw him advance to the quarter-finals on Sunday.

The Czech youngster produced another impressive showing to beat number six seed Felix Auger-Aliassime 4-6 6-3 7-6 (7-2) 7-6 (7-3) in the fourth round.

Despite having never won a main draw match at a grand slam prior to this tournament, Lehecka has now defeated three seeds, having also dispatched of Borna Coric (21) and Cameron Norrie (11) during his passage to the last eight.

"Honestly, it feels amazing," he said after the victory. "To be in the quarters, I wouldn't believe it if somebody told me this when I was on my way over here.

"I'm super excited for everything that will come next. Of course, I'll try to do my best to recover well and to show my best tennis again in my next match."

While his Canadian opponent utilised his serve well, hitting 20 aces, it was on net points where Lehecka thrived, winning 33 of 41 while Auger-Aliassime managed just 11 of 26.

The 21-year-old has another big test next as he faces third seed Stefanos Tsitsipas, having lost to the Greek in their one previous meeting in Rotterdam in February despite winning the first set.

"I'll be super excited [to face Tsitsipas]," Lehecka said. "I will go for that revenge, for sure. I know that he will remember how we played last year in Rotterdam. One set I was the better player on the court. Then he overtook the match. But I think that he will remember, and he will know what my strengths are.

"He will feel that I can get him under pressure. At the same time, I know that he's a great player. I mean, he's number four in the world.

"I know how to play against him."

Elena Rybakina believes she can become the best player in the world if she performs as she did in the first week of the Australian Open after beating Iga Swiatek.

Wimbledon champion Rybakina claimed the scalp of the top seed on Sunday, winning 6-4 6-4 on Rod Laver Arena to reach the quarter-finals.

Swiatek was in a class of her own last year, winning eight titles – including the French Open and the US Open – to firmly establish herself as the best player in the world.

The Pole was the favourite to win the Australian Open for the first time, but the 25-ranked Rybakina sent her packing to set up a showdown with Jelena Ostapenko.

Rybakina made history with her fourth-round win, becoming the first woman representing Kazakhstan to reach the quarter-finals of the Australian Open.

The 23-year-old knows she has plenty to work on, but feels she can rise to the top of the rankings if she continues to improve and consistently match the high standards she has set at Melbourne Park.

Asked if she can be the best in the world when she's at her best: "Every opponent is really tough, and for sure for me I think there are still many things to improve.

"If I perform like I did this week and consistently, I will say that I can be number one, I can beat anyone. For now, I need to find my consistency."

Rybakina felt she was rewarded for taking such a positive approach against Swiatek.

"For sure when you play against the number one player, I think you have really nothing to lose. I knew that I had to be aggressive from the first ball because she's a great mover, and she defends really well.

"So I was trying to just attack her from the first ball, and it really worked well."

Karen Khachanov achieved something not seen at the Australian Open in 11 years as he beat Yoshihito Nishioka in straight sets at Melbourne Park.

The Russian number 18 seed remarkably won the first 14 games of the fourth-round contest, inflicting two double bagels on Japanese opponent on Sunday.

That had not been achieved in the men's draw since Philipp Petzschner won the first two sets against Lukas Rosol without losing a game in 2012, and was just the fifth time it had happened in the Open Era.

Khachanov completely dominated Nishioka until the third set, incredibly only dropping two points in the whole of the second.

Nishioka, seeded 31, showed some fight to force a third-set tie-break, but Khachanov came out on top in the breaker to seal his place in the quarter-finals, where he will face American Sebastian Korda.

"First two sets I didn't know what was going on, but it's never easy when you are going with the score too easy. You feel it," Khachanov said after the victory. "Then at one point Yoshi tried to turn it around, he pumped [up] the crowd and it's normal.

"I tried to stay focused all the match from the beginning until the end. But it's not easy to win with this score, three sets, so the third set it was a really tough one and I'm playing well, so I'm really happy to go through."

Top seed Iga Swiatek says the pressure of not wanting to lose at the Australian Open got to her and believes she needs a change of mindset after her fourth-round loss to Elena Rybakina.

The three-time grand slam champion had come into the Australian Open as the title favourite but was bundled out by 2022 Wimbledon champion Rybakina 6-4 6-4 in one hour and 30 minutes on Sunday.

The Kazakh's power was too much for Swiatek, with Rybakina outstanding on serve, leading to apparent frustration from the world number one as the match slipped away.

"I felt the pressure, and I felt that I don't want to lose instead of I want to win," Swiatek told reporters. "So that's a base of what I should focus on in next couple of weeks.

"It was just tough. But for sure I need to work on my kind of mindset and fight a little bit more as I did last season.

"So, for sure I'm going to take time right now to kind of reset."

Swiatek won both the US Open and French Open titles in 2022, while she went on a 37-match winning streak that ended during Wimbledon.

The 21-year-old Pole denied that the pressure of being the world number one played a part in her exit.

"I don't think that matters," she said. "I experience it differently because I felt differently.

"But I was number one on Roland Garros, I was number one on Wimbledon, and US Open. I was able to - maybe not on Wimbledon - but I was able to play well and compete. I don't think that matters."

Swiatek was able to bounce back from her third-round Wimbledon loss to Alize Cornet quickly by triumphing at Flushing Meadows only two months later but she would not draw an parallels with Sunday's defeat.

"I don't see that many similarities, honestly," Swiatek said. "I feel like it's pretty easy. I just wasted too much energy before the tournament and during the first days of the tournament to worry.

"It's just different period of time for me. Before the US Open I was actually able to kind of let it go because I played pretty bad in Toronto and Cincinnati, and that helped me kind of to reset and just start the US Open without actually expecting much from myself.

"Here was different, so I'm not connecting the US Open with the streak at all. I'm not comparing this situation to my Wimbledon loss."

Swiatek praised Rybakina, who will face Jelena Ostapenko in the quarter-finals, for her play on Sunday, stating she was tactically composed and focused.

Coco Gauff revealed her frustration after her unbeaten start to 2013 was ended as the seventh seed bowed out of the Australian Open to Jelena Ostapenko in the fourth round on Sunday.

The 18-year-old American came into the Melbourne event fresh from victory at the Auckland Open but had not dropped a set in her three Australian Open victories, including toppling Emma Raducanu in the second round.

Gauff enjoyed a strong 2022 season that included reaching the US Open quarter-finals and finishing runner-up at the French Open.

But on Sunday, 2017 French Open champion Ostapenko triumphed 7-5 6-3 in one hour and 34 minutes, ending Gauff's Australian Open campaign, leaving the teenager in tears as she explained her frustration.

"I felt really good coming into the tournament, and I still feel good," Gauff told reporters. "I still feel like I've improved a lot but when you play a player like her and she plays really well, you know there's nothing you can do.

"I feel like today I would say nothing because every match you play a part in, but I feel like it was rough, so it's a little bit frustrating on that part."

Ostapenko hit 30 winners compared to Gauff's 21, while the Latvian did commit more unforced errors (27-14).

Gauff generated eight break points throughout the match but only took one, while Ostapenko took all three of hers.

"Today I learned a lot," Gauff said. "A little bit frustrated, but I think I'll rewatch and see where I went wrong and if I did go wrong.

"I feel like from the feedback I've gotten that she just played really well today. She stepped up her game when she needed to, and she held and broke me when she needed to, and I didn't do that."

Ostapenko progresses to the quarter-finals where she will take on 2022 Wimbledon champion Elena Rybakina who knocked off top seed Iga Swiatek.

World number one Iga Swiatek was knocked out of the Australian Open in straight sets in the fourth round by Wimbledon champion Elena Rybakina on Sunday.

The reigning US Open and French Open winner could not handle Rybakina's outstanding serve, with the Kazakh triumphing 6-4 6-4 in one hour and 30 minutes on Rod Laver Arena.

Rybakina won 80 per cent of first-serve points, including sending down six aces, while she broke Swiatek four times throughout the match.

Swiatek's elimination means the top-two seeds in both the women's and men's singles are out, with Ons Jabeur losing in the second round.

Title favourite Swiatek had routed Cristina Bucsa in 55 minutes in Friday's third-round win but she was broken immediately on Sunday by 23-year-old Rykabina, who offered a different threat.

"It was a really tough match," Rybakina said during her on-court interview after the match. "I really respect Iga. Today I think I was serving so good. In the end, I think in the important moments I played really well. I think that was the difference."

Swiatek did respond after Rybakina's early break by squaring up the first set at 2-2, but the Kazakh re-claimed her lead for 4-3, before serving to love to clinch the opening frame.

The 21-year-old Pole seemed outclassed in the 42-minute first set, but responded immediately in the second, racing to a 3-0 lead, only for Rybakina to hit back again to get it back on serve.

Rybakina failed to convert two break points at 15-40 in the ninth game but capitalised on her third opportunity, before serving out for victory, including another big ace at 30-0.

Data slam: Swiatek's grand slam dominance halted

Swiatek had not dropped a set all tournament, prior to losing the opening frame to Rybakina. In fact, the Pole had lost only two sets in her past 10 grand slam matches, dating back to her 2022 US Open triumph. Including her 2022 French Open title, she had only dropped five sets in her previous 19 grand slam matches.

WINNERS/UNFORCED ERRORS

Swiatek – 15/14
Rybakina – 24/25

ACES/DOUBLE FAULTS

Swiatek – 2/1
Rybakina – 6/1

BREAK POINTS WON

Swiatek – 2/4
Rybakina – 4/6

Andy Murray and Novak Djokovic have called for changes to the Australian Open schedule after several late finishes in Melbourne.

Three-time grand slam champion Murray bowed out of the season's opening major on Saturday following a four-set defeat by Roberto Bautista Agut in round three.

The 35-year-old arrived in the clash having already spent over 10 hours on court across his victories over Matteo Berrettini and Thanasi Kokkinakis.

Murray's 4:05am local time finish in the latter match was the third-latest in tennis history after he recovered from two sets down to deny the home favourite in a thrilling clash that took five hours and 45 minutes to settle.

The Briton subsequently voiced his concerns with scheduling, which tournament director Craig Tiley has no plans to change.

He reiterated those worries after defeat by number 24 seed Bautista Agut, suggesting the Australian Open could follow the trend set by another of the sport's major events.

"I'm sure if you went and spoke to some sleep experts and sports scientists – the people that actually really know what's important for athletes to recover – they would tell you that sleep is the number one thing, that that's the most important thing," he said.

"Finishing matches at four in the morning isn't good for the players. I would also argue it's not good for the sport, anyone involved in it. I do think there's some quite simple things that can be done to change that.

"I think the US Open went to playing two matches in the day session. That would stop the day matches running into the night session starting too late.

"I think that's quite a simple one that you could look at. You'd still get quality matches during the day. The people who bought ground passes would get to see more of the top players, which would be excellent for them.

"I think if you did that, you could also potentially bring the night sessions slightly earlier, as well, like 6:00 or 6:30. That time, those few hours, can make a difference to the players."

Nine-time Melbourne champion Djokovic, who overcame injury to defeat Grigor Dimitrov in straight sets, concurred with Murray.

"I think that players' input is always important for tournament organisation. Whether it's decisive, we know that it's not, because it comes down to what the TV broadcasters want to have," Djokovic said. "That's the ultimate decision maker.

"I would agree with [Murray's] points. I think we have days when the day sessions go longer, but probably more days statistically in average where they finish – say five, six max – and you can start the night session an hour earlier at least.

"For the crowd, it's entertaining, it's exciting. For us, it's really gruelling. Even if you go through and win, prevail in these matches, you still have to come back.

"You have your sleeping cycle, rhythm disrupted completely, not enough time really to recover for another five-setter. Something needs to be addressed in terms of the schedule after what we've seen this year."

Magda Linette made it through to the fourth round of a grand slam for the first time after she beat Ekaterina Alexandrova 6-3 6-4 at the Australian Open.

The result, paired with Iga Swiatek's third-round win on Friday, also means that two Polish female players are through to a grand slam fourth round for the first time in the Open Era since 2008, when Marta Domachowska and Agnieszka Radwanska both reached the same stage of the same tournament.

Indeed, Linette also became just the fourth female Polish player to reach the last 16 at a grand slam in the Open Era after Domachowska, Radwanska and the current world number one Swiatek.

Linette – who had lost each of her previous six grand slam third-round matches – recovered from a break down in the first set against the number 19 seed, while the second went very differently.

The world number 45 raced out to a 4-0 lead and seemed on course to finish the job quickly, before Alexandrova fought back to 5-4.

Linette kept her nerve to serve out the win and set up a fourth-round clash against fourth seed Caroline Garcia, who came from a set down to defeat Laura Siegemund.

Andy Murray is confident he can reach the latter stages of a grand slam before calling time on his career after being left "disappointed" by his third-round exit at the Australian Open.

The 35-year-old showed what he is capable of by defeating Thanasi Kokkinakis in a near-six-hour epic in the early hours of Friday, but he came unstuck against Roberto Bautista Agut on Saturday.

Murray, who was also on the court for almost four hours against Matteo Berrettini in the first round, fell just short of a place in the last 16 with a 6-1 6-7 (9-7) 6-3 6-4 loss on Margaret Court Arena.

Three-time grand slam winner Murray is already looking ahead to the Rotterdam Open in three weeks' time, though, and is hopeful of making his mark at the French Open, Wimbledon and the US Open later in the year. 

"I can have a deeper run than the third round of a slam, there's no question about that," he told reporters. "Obviously draws can open up for you.

"I need to also help myself with that. If I was playing at this level last year, I probably wouldn't be ranked 50, 60 in the world. It's up to me to try and change that."

Murray, who was on court for around 14 hours across his three matches in Melbourne, says the amount of hours put into practising is made worthwhile as he looks to prolong his career.

"Obviously you never know exactly when the end is going to be," he said. "I would like to go out playing tennis like this, where I'm competing with the best players in the world in the biggest events and doing myself justice.

"There were maybe times the last year or so where I didn't really feel like I was playing well, and I didn't enjoy the way that I was playing.

"Those sacrifices and that effort that I put in allowed me to get through those matches and play at a high level that I think was entertaining for the people watching.

"I felt good about the way that I was playing. It's more enjoyable for me when I'm playing like that, when I'm coming into a major event and really believing that I can do some damage."

Perhaps showing signs of rustiness from his early-morning finish against Kokkinakis, Murray struggled in the first set against Bautista Agut as three double faults – as many as he had in the whole of his second-round match – handed the initiative to his opponent.

Murray recovered from a point down in the second set to level up via a tie-break, despite trailing 5-2 and 6-4, though Bautista Agut earned the only break of serve in the third set to edge back in front.

Never before had Murray played three successive five-set matches in the main draw of a grand slam, and that remains the case as Bautista Agut shut out the loud noise generated by the crowd to recover from an early break down and take the match.

"I have a lot of mixed emotions," said Murray, who has not reached a grand slam quarter-final in six years. "I feel like I gave everything that I had to this event. So I'm proud of that.

"That is all you can ever do. You can't always control the outcome. You can't control how well you're going to play or the result. You can control the effort that you put into it, and I gave everything that I had the last three matches. I'm very proud of that.

"But I'm also disappointed because I put loads of work into the beginning of this year and was playing well enough to have a really good run, have a deep run.

"I think even tonight I'm competing against a guy 20 in the world, and it's still very tight considering the circumstances. I feel disappointed because I feel like I could have gone quite a bit further."

Number 24 seed Bautista Agut, who has only once previously reached the last eight in Melbourne, will face Tommy Paul in the next round.