Tommy Paul is into the last four at a grand slam for the first time after overcoming surprise package Ben Shelton in an all-American quarter-final at the Australian Open.

Paul triumphed 7-6 (8-6) 6-3 5-7 6-4 against Shelton at Rod Laver Arena, ending the 20-year-old's surprise run on his first trip outside the United States. 

World number 35 Paul showed his class in longer exchanges between the two big-serving Americans, though Shelton briefly troubled the 25-year-old when he claimed the third set after going a break down.

Having found an immediate break to quell Shelton's momentum, Paul dominated on serve in the fourth set to become the first American man to reach the Australian Open semi-finals since Andy Roddick in 2009.

Having teed up a meeting with either Novak Djokovic or Andrey Rublev, Paul said: "Yesterday when I was doing a couple of interviews, they asked how it felt to be in the quarter-finals, and I was like, 'semi-finals sounds a little better'.

"I'm pumped to be there and really excited for whoever I play. Making it to the second week of a slam is everyone's dream when they start playing tennis. So I can't believe I'm here right now."

Data slam: Paul dominates on serve

Having originally appeared to be on course for a straight-sets triumph, Paul could have lost his way when Shelton claimed the third set, but the 25-year-old was outstanding on serve to see it through.

Paul won all 17 of his first-serve points in the final set, winning 86 per cent throughout the match as his quality told.

ACES/DOUBLE FAULTS

Paul – 7/3
Shelton – 24/6

WINNERS/UNFORCED ERRORS

Paul – 43/26
Shelton – 42/50

BREAK POINTS WON

Paul – 3/15
Shelton – 2/4 

Victoria Azarenka sympathised with Novak Djokovic as she stated tennis players are "not villains" after reaching the Australian Open semi-finals for the first time in a decade.

Azarenka beat Jessica Pegula 6-4 6-1 on Rod Laver Arena on Tuesday to set up a last-four meeting with Elena Rybakina.

Former world number one Azarenka came in for criticism when she took a medical timeout during her last semi-final at Melbourne Park back in 2013, delaying her match against Sloane Stephens by 10 minutes.

The Belarusian, who is now 33, returned to beat Stephens and went on to defend successfully her title.

Questions have been raised over the extent of a hamstring issue nine-time Australian Open champion Djokovic has been contending with as he attempts to match Rafael Nadal's tally of 22 major triumphs this weekend.

Azarenka feels it is out of order for such suspicions to be raised by people who are not aware of the facts.

She said: "Do you know what happened 10 years ago? That's the thing.

"It was one of the worst things that I've ever gone through in my professional career, the way I was treated after that moment, the way I had to explain myself until 10:30pm at night because people didn't want to believe me. I actually can resonate what Novak said the other day.

"There is sometimes incredible desire for a villain and a hero story that has to be written. But we're not villains, we're not heroes, we are regular human beings that go through so many, many things.

"Assumptions and judgements, all those comments, are just s*** because nobody's there to see the full story. It didn't matter how many times I said my story, it did not cut through.

"Actually it's funny that you're saying that because I was thinking about it. It took me 10 f****** years to get over it. I finally am over that."

Asked to expound what the judgements or assumptions she experienced were, Azarenka said: "I've been called that I'm cheating, that I'm faking, that I was trying to throw people off their game. It's everything that is so wrong about my character if somebody actually knows me.

"At some point I've heard that she has this thing that is bad or this thing is bad, whatever. At some point you're like, 'Really? Am I?'. Those doubts starts to creep in.

"Now I just don't care. I am more and more confident in what I know about myself, and I'm at peace with that. Those comments, judgements, they're there. I notice them. But I don't care."

Karen Khachanov has defended his decision to publicly show support for the breakaway region of Artsakh, despite drawing the ire of the Azerbaijan Tennis Federation (ATF).

Khachanov – who was born in Russia but has an Armenian father – has written supportive messages on a camera twice during his run to the semi-finals of the Australian Open.

Azerbaijan's blockade of Artsakh, which began in December, is part of the ongoing Nagorno-Karabakh conflict, with the area internationally recognised as part of Azerbaijan despite historically being a part of Armenia.

Following Khachanov's show of support, the ATF wrote to the International Tennis Federation, calling the world number 20's messages a "hateful act".

The statement added: "The ATF condemned this act and demanded that the tennis player be punished and urged the International Tennis Federation to take harsh measures for prevention of such incidents in the future."

Speaking after his quarter-final win over Sebastian Korda, in which the American retired hurt with Khachanov leading by two sets and a break, the Russian defended his actions.

"I say many times. I have Armenian roots," he said. "From my father's side, from my grandfather's side, even from my mum's side. I'm half Armenian.

"To be honest, I don't want to go deeper than that, and I just wanted to show strength and support to my people. That's it."

On whether he had heard from the ITF since the complaint was made, Khachanov replied: "I didn't hear anything about that," adding that he has also not been told to stop writing the messages on cameras.

Khachanov will play Stefanos Tsitsipas in the Australian Open semi-finals on Friday.

Stefanos Tsitsipas has invited Margot Robbie to watch him at the Australian Open after charging through to the semi-finals in Melbourne.

The Greek tennis star says he is a huge fan of the Australian actor and would love her to support him from the Melbourne Park stands.

His surprise shout-out to Robbie came after Tsitsipas scored a 6-3 7-6 (7-2) 6-4 win against unseeded Czech Jiri Lehecka in the quarter-finals on Tuesday.

Tsitsipas was partway through explaining his impressive display to on-court interviewer Jim Courier, detailing how it took "experience and some good Spartan attitude" to get the better of Lehecka, when he mentioned the 32-year-old Hollywood star.

Robbie, married to English film producer Tom Ackerley, became well known in Australia and the UK for her role in the soap opera Neighbours before turning to Hollywood.

Her career includes prominent roles in movies including The Wolf of Wall Street, Suicide Squad and I, Tonya, as well as being the voice of Flopsy Rabbit in the Peter Rabbit film series.

"Can you hear them? Australia is such a great country," Tsitsipas said, reacting to roars from the crowd.

"I like a lot of great Aussie things. One of my favourite actresses comes from Australia, Margot Robbie."

Former Australian Open champion Courier, surprised by that unprompted mention, said: "Are you pitching right now?"

That prompted Tsitsipas to say: "It would be nice to see her over there one day."

Was that an invitation to Robbie?

"Absolutely," Tsitsipas said.

The 24-year-old Greek player soon stressed that his Robbie fandom was not the main reason for him enjoying Australia.

"That's not it," Tsitsipas said. "The people are very welcoming. I've said that so many times and will keep saying it because it's true.

"I grew up in a place that's very similar in terms of conditions and lifestyle and find myself feeling home when I'm here because it's not too tropical, and it's not too humid, and it very much feels like home.

"The French players have Roland Garros as their home grand slam, the British players have Wimbledon, the Americans have the US Open; for me, the Australian Open is always going to be my home grand slam.

"I would love one day hopefully winning the Aussie Open and giving a bit portion of the prize-money to build a school in Victoria which is the state of education. I'd like to do that."

Stefanos Tsitsipas stormed into a third consecutive Australian Open semi-final with a straight-sets victory over Jiri Lehecka on Tuesday.

Tsitsipas has bowed out at the last-four stage in three of the past four years, but the Greek will get another chance to reach a first final after beating Lehecka 6-3 7-6 (7-2) 6-4.

The third seed from Greece fired down nine aces and hit 36 winners on Rod Laver Arena, winning without having his serve broken to set up a meeting with Russian Karen Khachanov.

Unseeded Czech Lehecka was broken in his first service game and Tsitsipas did not give him a look-in from then on in the first set.

The 21-year-old Lehecka had the favourite in trouble in the fourth game of the second set, but saw five break-point opportunities come and go.

Tsitsipas clinically won the tie-break to move a set away from the semi-finals, but Lehecka put up a great fight but was frustrated when he was unable to convert another three break points before the favourite held to lead 4-3.

Another tie-break looked possible until Lehecka's excellent run in only his second main-draw appearance came to an end when he netted a backhand following a thunderous cross-court winner from a fired-up Tsitsipas.

Tsitsipas maintains perfect quarter-final record

A first major title has so far eluded Tsitsipas, but he keeps knocking on the door and is two wins away from achieving that dream.

The 24-year-old is the fourth male player in the Open Era to be unbeaten in his first six grand slam quarter-finals after Rod Laver, Patrick Rafter, and Andre Agassi. 

ACES/DOUBLE FAULTS

Tsitsipas – 9/2
Lehecka– 7/4

WINNERS/UNFORCED ERRORS

Tsitsipas– 36/28
Lehecka– 38/32

BREAK POINTS WON

Tsitsipas – 2/6
Lehecka – 0/8

Sebastian Korda is taking plenty of positives away from the Australian Open, despite retiring hurt in his quarter-final against Karen Khachanov.

The American sustained an issue to his right wrist early in the second set, before calling an end to proceedings in the third when trailing 7-6 (7-5) 6-3 3-0.

Speaking at a press conference after his elimination, Korda said it was an issue he originally felt at the Adelaide International 1, where he was beaten by Novak Djokovic in the final.

"I had it a little bit in Adelaide a couple of weeks ago, but then it went away," he said. "During the matches, it was completely fine. Then just one kind of mishit return and it started to bother me a lot of after that.

"I knew what it was right away, right when I hit the return. I kind of felt that spot that I was feeling before. Some forehands I couldn't even hold the racquet. Volleying was almost impossible for me. So it was a little tough."

The number 29 seed was pleased with his work in Melbourne though, adding: "Obviously a lot of positives [to take]. Still a great tournament. My first quarter-final in a grand slam. I'm going to go forward with my head high and keep working."

Khachanov is through to his second-consecutive grand slam semi-final, having also made the final four at last year's US Open.

The Russian – who will face either Stefanos Tsitsipas or Jiri Lehecka next – sympathised with Korda but said he was just focused on getting the job done.

"It's part of the sport," Khachanov said. "It was a tough competitive battle until a certain moment, but at the end of the day you don't know how serious he's injured, right?

"I think the end of the second set, you know, when I pushed through and then took it with 2-0 lead by sets, it's extra pressure to the guy, if especially he has some issues physically.

"I think also the beginning of the third, you know, when you take this [3-0] lead, so from the opponent, the attitude change, it's way tougher to come back, so I think all those things together. I was quite focused and I knew what I had to do, how I had to push. I did it really well."

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

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."

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.

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

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."

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."

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.