Karen Khachanov is through to his second-consecutive grand slam semi-final after progressing past Sebastian Korda at the Australian Open.

The Russian – who also made the final four at last year's US Open – was in control of the quarter-final when Korda retired hurt with a wrist problem at Melbourne Park on Tuesday.

Khachanov led 7-6 (7-5) 6-3 3-0 when the American called it a day, and will face either Stefanos Tsitsipas or Jiri Lehecka next.

The number 18 seed had to work hard to take the opening set, with Korda initially saving himself when Khachanov served for it at 5-3, but the latter eventually came through on a tie-break.

Some ferocious and accurate hitting from the baseline was proving to be decisive for Khachanov, hitting 12 winners in each of the first and second sets.

Halfway through the second set, 29th seed Korda received a medical timeout for a right wrist issue that was clearly impacting his forehand, and from there he won just one more game before retiring.

"For sure, back-to-back semi-finals in a grand slam feels great," Khachanov said in his on-court interview after the match.

"Obviously not the way you want to finish the match. I think until a certain point it was very competitive, a very good battle. Sebastian beat one of my friends, Daniil [Medvedev], in three sets and won in five sets against [Hubert] Hurkacz. He is playing great tennis."

Data Slam: Khachanov serves up a treat

Although clearly aided by Korda's struggles later in the contest, Khachanov was impressive on his serve throughout, only being broken once when serving for the first set.

He was able to win 80 per cent (40 of 50) of points on his first serve.

ACES/DOUBLE FAULTS

Khachanov – 12/0

Korda – 4/2

WINNERS/UNFORCED ERRORS

Khachanov – 27/18

Korda – 18/39

BREAK POINTS WON

Khachanov – 4/10

Korda – 1/3

Elena Rybakina is through to the semi-final of the Australian Open after a convincing 6-2 6-4 victory against Jelena Ostapenko on Tuesday.

Rybakina, 25, became the first man or woman from Kazakhstan to win a grand slam when she lifted the Wimbledon trophy in 2022, and she is now two matches away from securing her second.

Against Latvia's Ostapenko, Rybakina had a clear power advantage, illustrated by her 11 aces while conceding only one.

She secured a break in the first game of the match, and quickly grabbed a second to race through the first set in 33 minutes. 

It was Ostapenko who snagged the early break in the second set, but she was unable to consolidate it, failing to hold serve in each of her next two chances to allow Rybakina to claw back in front.

Ostapenko will rue some wasteful play as she finished with more break point opportunities than her victorious opponent, but was only able to convert one of her eight chances.

Rybakina will meet the winner between Jessica Pegula and Victoria Azarenka in the semi-final.

Data Slam: Rybakina adds a new string to her bow

With 29 aces so far, Rybakina leads all women at this year's Australian Open in the category. That figure is a testament to her overall serving improvement, as well as what is now her deepest run down under, with more aces this tournament than her past three Australian Open campaigns combined.

ACES/DOUBLE FAULTS

Rybakina – 11/3

Ostapenko – 1/1

WINNERS/UNFORCED ERRORS

Rybakina – 24/21

Ostapenko – 19/22

BREAK POINTS WON

Rybakina – 4/6

Ostapenko – 1/8

Ben Shelton is juggling revision for exams with his hopes of going all the way at the Australian Open.

Shelton beat fellow American J.J. Wolf to set up a quarter-final tie with Tommy Paul – another compatriot – in Melbourne.

The 20-year-old is the lowest-ranked American player to reach a grand slam quarter-final since Todd Martin at the US Open 2000 and the lowest at the Australian Open since Michael Chang in 1996.

This trip Down Under is Shelton's first venture outside the United States, and while focusing on his budding tennis career, he is also taking a general business degree, learning via online classes.

"No exams yet, so it's going to get interesting when my exam dates might conflict with some of my matches," Shelton quipped. "A few assignments here and there. Pretty easy stuff.

"I'm taking classes at a bit slower pace than I was when I was full time in school. I don't have too difficult of a workload.

"It's very manageable while I'm playing tennis. So far in January I haven't had any problems or conflicts.

"I really want to get my degree. It's something that's important to me. That's something that I'm going to stick to and continue to do."

Shelton is one of three American players to have reached the quarters – the others Paul and Sebastian Korda.

It is the first time since the 2005 US Open that three American male players have reached the last eight at a major. It is the first time it has happened in Melbourne since 2000.

"It's definitely a surprise. I got on the plane with no expectations," Shelton said.

"I know that it's very hard to adjust to Australia from the United States just with the jet lag, time change and everything.

"It being my first time, never being out of the United States, I knew it would be a struggle.

"I think it has helped me a little bit, not having that expectation or the feeling that I have to perform, but being able to just go out there, be myself and play free. I think that's been a big contribution to my success.

"Each match that I've won here has felt the same. It's a mixture of joy, relief. I just have that feeling of ecstasy. When the last ball lands, I did it. To be able to do that on this stage four times in a row, that feeling over and over again, has been pretty cool."

Novak Djokovic felt "fantastic" as he outclassed Alex de Minaur with his best performance of the year in the fourth round of the Australian Open.

The nine-time champion outclassed Australian De Minaur on Rod Laver Arena, winning 6-2 6-1 6-2 in two hours and six minutes on Monday.

A hamstring injury has been a concern for Djokovic as he bids to win a record-equalling 22nd grand slam title at Melbourne Park, but he was moving freely as he ruthlessly breezed into the quarter-finals.

The fourth seed from Serbia did not face a break point, delivering another returning masterclass and serving superbly to set up a meeting with Russian Andrey Rublev.

Djokovic has won 25 consecutive Australian Open matches – just one shy of Andre Agassi's record – and the 35-year-old rated his demolition of De Minaur as his most impressive of the year.

He said: "Definitely the best tennis I've played this year, this tournament, so far this season. Best match. I'm really glad because obviously as the tournament progresses, the matches are going to get tougher. I'm really glad to manage to win the way I did.

"To feel really great in terms of mobility and movement of my leg, which is great news. So all in all, perfect match for me."

Djokovic did not feel any pain as he brushed De Minaur aside to move into his 13th Australian Open quarter-final and the last eight of a major for the 54th time. 

He added: "We take it day by day. We do a lot of things. It's been honestly exhausting to be involved in a lot of different treatments and machines and stuff that we do.

"At the same time it was necessary. It is necessary in order to get myself in a condition to play. So I'm really glad that my body has responded really well.

"Tonight I didn't feel any pain. I moved as well as I have the whole tournament. It means we are progressing in the right direction.

"Some days you feel good; some days maybe not as. So, as I said on the court, I do not want to celebrate too early because I don't know how the body's going to respond tomorrow and for the next match. What I felt tonight is fantastic."

Andrey Rublev suggested he had given up hope at 5-0 down in the deciding tie-break against Holger Rune.

Rublev prevailed 6-3 3-6 6-3 4-6 7-6 (11-9) in a three-and-a-half-hour thriller against the Dane on Monday to progress to the quarter-finals of the Australian Open.

The Russian salvaged two match points to force a tie-break at the end of the fifth set, but found himself staring down the barrel of an exit from the season's first major as Rune cruised into a commanding lead.

Yet Rublev won nine of the next 11 points and, at the third attempt, sealed a remarkable victory when a shot that hit the net cord trickled just over.

"Yes, I was lucky," Rublev said in his post-match press conference.

"I started to think it's over, for sure. Somehow... I was able to start to play with much more focus."

Asked how he maintained his self-belief, Rublev quipped: "I was not believing."

"Beginning of the fifth set, I was completely frozen. Inside I was thinking that I cannot [win]. I cannot move. I cannot hit.

"I was thinking it's over. He's playing much better than me. He deserves to win. He's going for the shots. He's doing something that normally I am supposed to do if I want to win the match.

"I let it go. Somehow the stress that I had, I was able to relieve it. At the end of the match I played much better than during the rest of the match."

During his on-court interview, Rublev said: "I was never able to win matches like this, this is the first time I've won something like this.

"At a very special tournament, to be in a quarter-final, it's something I'll remember all my life. I'm shaking!"

Rublev has qualified for his second Australian Open quarter-final, and his seventh at a grand slam. However, he has lost all of those matches.

The world number six, seeded fifth in Melbourne, has won three successive matches that have gone the distance, a career-first. Now, he will meet nine-time champion Novak Djokovic, who defeated Alex de Minaur in straight sets.

"I don't know," Rublev replied when asked if Djokovic was unbeatable. 

"Novak is very tough player to beat, especially in the slams.

"He has the best experience to win these matches. He's one of the best in history. The only chance I have is if I play my best tennis, just fight for every ball, and that's it. That's the only chance."

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.