Daniil Medvedev flicked away the threat of Felix Auger-Aliassime to reach his third grand slam final and second US Open title match.

The Russian was briefly in trouble in the second set, when Auger-Aliassime could not serve it out after establishing a 5-2 lead, but he was otherwise in charge as he nailed a 6-4 7-5 6-2 semi-final win.

It means the man who was beaten by Rafael Nadal in a mesmerising 2019 Flushing Meadows final will be back on Sunday to go after a first title at the majors.

World number two Medvedev looked in good shape here, and it was always going to take a major effort for 12th-seeded Canadian Auger-Aliassime to test him.

That test arrived when Auger-Aliassime led by a break in the second set but could not finish the job.

Medvedev soon levelled the set at 5-5 and Auger-Aliassime coughed up an ugly double fault to give him a look at 0-30 in the next game, before fluffing a volley to present the Russian with three game points.

A forehand into the net moved Medvedev into a 6-5 lead, serving for a two-set cushion, and a fuss-free game moved the Moscow-born 25-year-old one step away from the final.

Auger-Aliassime was looking to follow his fellow Canadian Leylah Fernandez into a US Open final this weekend, yet the failure to seize that one big chance was his undoing.

Playing ahead of the second semi-final between calendar Grand Slam-hunting Novak Djokovic and Olympic champion Alexander Zverev, it was plain sailing in the third set for Medvedev.

He struck a startling forehand winner around the net post late in the contest, demonstrating the sort of class to test the best.

Medvedev described the clash as "a strange match", saying in an on-court interview: "I think everybody thought it was going to be one set all, and you never know where the match is going to go.

"I managed to save the set points: he missed one volley and I won one good point, and the match turned around completely. I don't think I played my best today, but I'm really happy to be in the final."

He quite reasonably described his five-set thriller against Nadal two years ago as "a crazy match".

"If it's going to be a crazy match on Sunday, I just hope I can win this time," he added.

DATA SLAM

Medvedev won a terrific 81 per cent of points when landing his first serve in court, which is match-winning tennis and the sort of form he may need in the final. A three-set drubbing by Djokovic in the Australian Open final at the start of this year was an anti-climax given the match promised so much, and Medvedev won just 69 per cent on first serve in that one-sided match. All the ratios looked good for Medvedev in this match, but he will know the final is a step up. He looks destined to win multiple grand slams, but getting the first one is often the toughest.

WINNERS/UNFORCED ERRORS

Medvedev – 37/25
Auger-Aliassime – 17/39

ACES/DOUBLE FAULTS

Medvedev – 12/4
Auger-Aliassime – 4/10

BREAK POINTS WON

Medvedev – 5/5
Auger-Aliassime – 1/3

History-making British qualifier Emma Raducanu admits she cannot "actually believe" she has reached the US Open final at her first attempt.

The 18-year-old world number 150 stunned 17th seed Maria Sakkari 6-1 6-4 to book her spot in the US Open final, where she will meet fellow teenager Leylah Fernandez.

Raducanu is only appearing in her second grand slam, having made a run to the fourth round at Wimbledon in June.

The Briton has become the first qualifier in the Open era, male or female, to reach the final of a major tournament, while she is the youngest grand slam finalist since Maria Sharapova at Wimbledon in 2004.

On top of that, Raducanu is the first British woman to reach a grand slam final since Virginia Wade in 1977.

"The time here in New York has gone so fast," Raducanu said during her on-court interview.

"I've just been taking care of each day and before you know it, three weeks later, I'm in the final and I can't actually believe it."

She added during her post-match news conference: "[It is] a surprise. Honestly, I just can't believe it. A shock. Crazy. All of the above.

"It means a lot to be here in this situation. I wanted, obviously, to be playing grand slams, but I didn't know how soon that would be. To be in a grand slam final at this stage of my career… I have no words."

The Canada-born teenager will become only the fourth British woman in the Open era to appear in a grand slam final after Wade, Sue Barker and Ann Haydon-Jones.

Raducanu, who was full of praise for the Arthur Ashe Stadium crowd, added that she was feeling no pressure or expectation.

"Is there any expectation? I'm a qualifier, so technically there's no pressure on me," she said.

Raducanu was glowing in her praise for former British men's number one and four-time Wimbledon semi-finalist Tim Henman, who has been in her box during this tournament.

"Tim is honestly such a big inspiration. He's been helping me, telling me to treat it one point at a time," Raducanu added.

"In moments like this, you can't get ahead of yourself and you really have to stay present."

The US Open decider will be the first grand slam final between teenagers since the 1999 edition at Flushing Meadows when Serena Williams (17) defeated Martina Hingis (18).

Canadian teenager Leylah Fernandez said "there is no limit to her potential" after beating a third top-five player at the US Open to qualify for her maiden grand slam final in New York.

Fernandez, who celebrated her 19th birthday on Monday, shocked second seed Aryna Sabalenka 7-6 (7-3) 4-6 6-4 in two hours, 20 minutes on Thursday.

British teenager Emma Raducanu, 18, awaits in Saturday's final at Flushing Meadows.

The decider will be the eighth grand slam final in the Open Era between teenagers and first since the 1999 US Open when Serena Williams defeated Martina Hingis. Williams, who remains an active player, has gone on to win 23 major titles, while Hingis won five.

"Impossible is nothing. Like my dad would tell me all the time there's no limit to my potential to what I can do," Fernandez told reporters post-match.

"Nothing's impossible. There's no limit to what I can do. I'm just glad that right now everything's going well."

Fernandez only claimed her maiden WTA Tour title in March, triumphing at the Monterrey Open, while she is only playing her third grand slam, never going further than the third round until this tournament.

The Montreal-born talent labelled her US Open run as "magical" having knocked out top-five trio Sabalenka, defending champion Naomi Osaka and fifth seed Elina Svitolina, along with three-time slam winner Angelique Kerber.

"I think I've been doing some things incredible," Fernandez said. "One word that really stuck to me is 'magical' because not only is my run really good but also the way I'm playing right now.

"I'm just having fun, I'm trying to produce something for the crowd to enjoy. I'm glad that whatever I'm doing on court, the fans are loving it and I'm loving it, too. We'll say it's magical."

Fernandez also revealed when she was in grade six, a teacher had told her to stop playing tennis and focus on school.

"I'm just glad that she told me that because every day I have that phrase in my head saying that I'm going to keep going, I'm going to push through, and I'm going to prove to her everything that I've dreamed of I'm going to achieve them," she said. "I think now I can say that I've done a pretty good job in achieving my dreams."

Aryna Sabalenka said she "destroyed" herself and bemoaned her inability to take opportunities after suffering a shock loss to teenage sensation Leylah Fernandez in the semi-finals of the US Open.

Sabalenka – the second seed – was beaten 7-6 (7-3) 4-6 6-4 to 19-year-old unseeded Canadian Fernandez at Flushing Meadows on Thursday.

The 23-year-old Sabalenka, who has won more matches than any player on the WTA Tour this year, has never reached a major final and her wait continues after also falling in the Wimbledon semis in June.

Sabalenka squandered a set point in the opening set, before losing her final service game to love to bow out on Arthur Ashe Stadium.

"This is life. If you're not using your opportunities, someone else will use it," Belarusian star Sabalenka said at her post-match news conference. "This is what happened today.

"This is what we call pressure. I had a lot of opportunities and I didn't use it. I will try to improve it. I will keep working and fighting, and I believe that one day it will come."

Sabalenka had dominated early, leading 3-0 inside 10 minutes as she barely missed a first serve, before Fernandez rallied to claim the first set.

"I wouldn't say that she did something. I would say that I destroy myself," Sabalenka said. "On the key moment, I was up 4-2 serving, and I think I made double-faults. My first-serve percentage wasn't really good."

Sabalenka identified a key lesson for her was not to "over-think" opportunities, while she was positive about her conqueror Fernandez, who she said was playing like a "top-10 player".

"Now there is no pressure on her at all. Crowd are here for her," Sabalenka said.

"But the question is when you will start to understand what's going on and where you are, how good can you deal with all these expectations and all this level, all this pressure.

"She's like a top-10 player. We'll see how good she will be in the future."

Fernandez will play 18-year-old Emma Raducanu in Saturday's final, marking the first time two teenagers have met in a grand slam decider since Martina Hingis and Serena Williams at Flushing Meadows in 1999.

Canadian teenager Leylah Fernandez shocked US Open second seed Aryna Sabalenka 7-6 (7-3) 4-6 6-4 to reach her first grand slam final on Thursday.

Fernandez continued her giant-slaying run at Flushing Meadows, where the 19-year-old sensation has stunned defending champion Naomi Osaka, 2016 winner Angelique Kerber, fifth seed Elina Svitolina and Sabalenka en route to the decider.

Fellow teenage sensation Emma Raducanu or 17th seed Maria Sakkari await Fernandez in Saturday's final in New York.

The defeat is a bitter blow for Belarusian star Sabalenka, who has never reached a major final, having also lost in the final four at Wimbledon this year.

The semi-final was full of momentum swings, but 52-23 unforced errors and 8-2 double faults ultimately were costly for Sabalenka, who lost the final game on her serve to love to hand Fernandez victory.

Sabalenka had raced to an early 3-0 lead inside 10 minutes on Arthur Ashe Stadium, dominating with her power, missing only one of her first 13 first serves, before Fernandez settled into the contest.

Trailing 4-2, Fernandez – the youngest woman to beat multiple top-five opponents at the same slam since Serena Williams in 1999 – broke back as Sabalenka's first serve let her down, with the former converting the third of three break points.

Fernandez, who survived a break point to level it up at 4-4, eventually closed out the first set in a tie-break.

Sabalenka made a statement by breaking to love in the opening game of the second set, but Fernandez responded with a break of her own to level it at 2-2.

The second seemed destined for another tie-break, however Sabalenka broke to lead 5-4 and she never looked back as the 23-year-old forced a deciding set.

Fernandez seized control, breaking Sabalenka to move 4-2 ahead, though the latter responded immediately, despite the teenager taking her service game to deuce after trailing 0-40.

However, Fernandez held serve at 5-4 before breaking Sabalenka again to love to claim another memorable victory at the US Open.

Data Slam: Oh, Canada!

Fernandez's victory marks the second time in three years that a Canadian teenager has reached the US Open final, with then-19-year-old Bianca Andreescu beating Serena Williams in 2019. Canadian Felix Auger-Aliassime remains alive in the men's semi-finals too.

WINNERS/UNFORCED ERRORS

Fernandez – 26/23
Sabalenka – 45/52

ACES/DOUBLE FAULTS

Fernandez – 6/2
Sabalenka – 10/8

BREAK POINTS WON

Fernandez – 4/7
Sabalenka – 4/11

Novak Djokovic knows he faces a tough challenge in his US Open semi-final with Alexander Zverev after coming from a set down to beat Matteo Berrettini.

The Serbian triumphed 5-7 6-2 6-2 6-3 to thwart Berrettini's revenge mission, having defeated the Italian in this year's Wimbledon final.

The world number one now faces the man who denied him a shot at the Golden Slam, with Zverev dumping Djokovic out of the semi-finals at Tokyo 2020.

And the 20-time grand slam winner was full of praise for his next opponent.

"He's in tremendous form, he's been winning a lot," said Djokovic, who still has the Calendar Grand Slam in his sights. "He has comfortably moved to the semi-finals here.

"I know his game well, we played in Tokyo. He's one of the best players in the world, but the bigger the challenge the more glory in overcoming it."

Reflecting on his victory over Berrettini, Djokovic felt he found his best form after dropping the opening set.

"This was a great match, with a lot of energy on and off the court," he said. 

"Matteo is a terrific player and every time we face each other it's a close battle.

"When I lost the first set, I managed to forget about it and move on. I was locked in at the start of the second and it was the best three sets I've played so far."

Novak Djokovic moved within two wins of an historic calendar Grand Slam at the US Open after completing a merciless comeback against Matteo Berrettini 5-7 6-2 6-2 6-3 en route to the semi-finals.

Berrettini was seeking revenge for his Wimbledon final loss to Djokovic and the Italian sixth seed gave himself a good chance after winning the opening set at Flushing Meadows on Wednesday.

But Berrettini was helplessly outclassed in a devastating display from world number one Djokovic, who is bidding to become just the third man to sweep all four majors in a year and first since 1969.

The 20-time major champion, who can also break the record for most men's slam titles – currently tied with Rafael Nadal and Roger Federer, will face Alexander Zverev in the New York semis.

For the third consecutive match, Djokovic done it the hard way, rallying after dropping the opening set, just like he did against Jenson Brooksby and Kei Nishikori.

In a brutal display of big hitting, Berrettini had the crowd roaring – firing down seven aces and saving two break points in a marathon first set lasting one hour, 17 minutes.

Berrettini held serve in a physically demanding sixth game after 12 minutes and seven deuces.

Djokovic – not without his chances – did not look like his usual self, spraying a forehand wide as Berrettini seized control following four set points.

Berrettini was looking to claim his first win over Djokovic after three consecutive defeats and earn his first top-10 victory at a grand slam (0-5 heading into the contest), but the Serb star turned the match on its head into the second set.

Djokovic, though, flipped the switch as he broke for the first time to move 3-1 ahead before consolidating for a 4-1 lead, silencing the pro-Berrettini crowd in New York, where the latter was unable to stop the rot.

Berrettini looked deflated and tired in the third set – Djokovic racing out to a commanding 3-0 advantage.

Djokovic missed the chance to move 5-2 ahead but it only delayed the inevitable as he fended off a break point the very next game to eventually earn a two-sets-to-one lead.

And the 34-year-old could not be stopped as he celebrated his 80th US Open match win in emphatic fashion.

Data slam: Can Djokovic be stopped?

Djokovic extended his winning streak at grand slams to 26 matches, while he also remains unbeaten in US Open quarter-finals (12-0). The record-chasing star also owns a 9-0 major record in 2021 after dropping the first set.

WINNERS/UNFORCED ERRORS

Djokovic – 44/28
Berrettini – 42/43

ACES/DOUBLE FAULTS

Djokovic – 12/4
Berrettini – 17/2

BREAK POINTS WON

Djokovic – 5/16
Berrettini – 1/5

Alexander Zverev is riding a wave at the US Open after his confidence-boosting win over world number one Novak Djokovic en route to claiming gold at the Olympic Games.

Zverev survived a first-set scare to power past Lloyd Harris 7-6 (8-6) 6-3 6-4 in Wednesday's US Open quarter-final.

The German fourth seed will face either Djokovic, who is bidding to become just the third man to complete a calendar Grand Slam and first since 1969, or Matteo Berrettini for a spot in the men's final at Flushing Meadows.

Zverev – last year's US Open runner-up – said he has been fuelled by his semi-final win over Djokovic at the Tokyo Games.

"It's the biggest tournament in the world, Tokyo. It's the Olympics," Zverev said during his post-match news conference.

"Winning there against the world number one, especially that I was down a set and a break, being kind of out of the match, then coming back, it was different than the other matches. The emotions were different.

"Also securing a medal for Germany was very special to me. This year it seems like nobody can beat him in a big match, nobody can beat him at the grand slams.

"I feel like I was the first player to beat him in a very big match this year. That does give you something. To any person it would give you something.

"As I said before also, I think it was very important for me to back it up in the finals, back it up in Cincinnati. Hopefully I can continue this streak."

Zverev is in the midst of a career-best 16-match winning streak and has clinched 37 of 40 sets on the hard courts after winning Olympic gold and his fifth career ATP Masters 1000 crown in Cincinnati.

The 24-year-old is bidding to become the second man in history to win Olympic gold medal and the US Open/US Championships title in the same season, after Andy Murray in 2012.

On preparing against Djokovic, Zverev added: "You have to be perfect, otherwise you will not win.

"Most of the time you can't be perfect. That's why most of the time people lose to him. Against him, you have to win the match yourself. You have to be the one that is dominating the points. You have to do it with very little unforced errors.

"He is the best player in the world. He is very difficult to beat. But he's still also got to win tonight. He's playing Matteo Berrettini who is in very good form, finals of Wimbledon. I think he's looking forward to that match, as well. It's going to be an interesting match to watch those two."

Maria Sakkari reached her second grand slam semi-final of the year after upstaging fourth seed Karolina Pliskova 6-4 6-4 at the US Open.

Sakkari made history at this year's French Open, where she became the first Greek woman to reach a grand slam singles semi-final.

The 17th seed continued her impressive 2021 with a straight-sets victory over former world number one and 2016 US Open finalist Pliskova in New York on Wednesday.

After one hour, 21 minutes on court, Sakkari will face high-flying English teenager Emma Raducanu for a spot in the Flushing Meadows decider.

Pliskova entered the quarter-final, having rediscovered her best form after a slow start to the season – the Czech star claimed just 15 wins from her first 12 WTA Tour tournaments before winning 19 matches from five events, reaching two finals, since the start of July.

But Sakkari proved too good on Arthur Ashe Stadium, where the 26-year-old utilised her almost flawless serve.

Sakkari lost just two points on serve in the opening set – claiming 92 per cent of her first serves, while hitting 12 winners and clinching the decisive break.

Pliskova owned three top-20 wins this season as she was looking to emulate countrywoman Hana Mandlikova, who won the US Open in 1985.

But the second set followed a similar pattern, Sakkari tallying 10 winners while winning 11 of her 12 first serves, closing out the match at the third time of asking.

Data Slam: Sakkari matches career high

With her dominant win over Pliskova, Sakkari – who did not face a break point – tallied her 31st victory of the year. It equalled her best return from 2019, when she finished with a 31-23 win-loss record.

WINNERS/UNFORCED ERRORS

Pliskova – 14/20
Sakkari – 22/12

ACES/DOUBLE FAULTS

Pliskova – 6/3
Sakkari – 4/1

BREAK POINTS WON

Pliskova – 0/0
Sakkari – 2/5

Alexander Zverev won his 16th match in a row with a straight-sets victory over Lloyd Harris on Wednesday to reach the US Open semi-finals.

The fourth seed saved a set point from Harris in a tense opener and built on that to earn a 7-6 (8-6) 6-3 6-4 triumph in a little over two hours.

Zverev has dropped just one set across his five matches at Flushing Meadows this year and will face either Novak Djokovic or Matteo Berrettini as he seeks a place in back-to-back finals.

"I just hope their match goes on for eight hours and 30 minutes," Zverev joked when asked who he would prefer to face in the semi-finals.

"I didn't have a lot of chances on Harris' serve today and somehow managed to win that first set, which loosened me up a little bit and I started playing a lot better.

"In the third set, he started swinging. He started playing incredible tennis. So yeah, I'm happy to be through in three."

Harris beat three top-30 seeds to make it to this stage and more than held his own in the opening set against Zverev, who lost to Dominic Thiem in last year's final.

After sharing a break of serve apiece, Harris led 6-5 in the tie-break but lost the next three points to offer his opponent a platform to build from.

Despite struggling with a minor back problem, Zverev took advantage of his unseeded opponent's five unforced errors by holding throughout the second set.

The four-time grand slam semi-finalist raced into a 4-0 lead in the third set, but Harris slowly regained his composure and claimed the next three games.

Zverev's monster serve came to his rescue, however, as he took the eighth game and eased over the line in style with his 21st ace of the contest.

DATA SLAM

Zverev did not have things all his own way as he struggled in the opening set and was sloppy when leading 4-1 in the final set, but he ultimately proved too strong for an opponent ranked 46th in the world.

Last year's beaten finalist Zverev has served 83 aces and just 15 double faults across his first five matches and won 82 per cent of his first-serve points against Harris. Whether it is Djokovic or Berrettini, a tougher test awaits in the semi-finals.

WINNERS/UNFORCED ERRORS

Zverev – 43/26
Harris – 34/26

ACES/DOUBLE FAULTS

Zverev – 21/5
Harris – 13/1

BREAK POINTS WON

Zverev – 4/9
Harris – 2/3

Emma Raducanu says she is on her "own journey" after sensationally reaching the semi-finals of the US Open.

Raducanu's 6-3 6-4 win over Belinda Bencic – her first career top-40 opponent – saw her become the first qualifier in the Open Era to advance to the last four at Flushing Meadows, the 18-year-old doing so without dropping a set.

She also became the lowest-ranked player in history (150) to make this stage of the tournament, with Kim Clijsters in 2009 and Billie Jean King in 1979 achieving the same feat having been unranked.

Raducanu, who will face either Karolina Pliskova or Maria Sakkari for a place in the final, said: "I have an absolutely amazing team. I have a team back home who could not be here. I am sure they are watching, I hope!

"Thank you so much everyone. I wish you could be here with me but everything we have been working for has shown here.

"To have so many young players here doing so well shows how strong the next generation is. Everyone is on their trajectory, so I am just here doing what I can control, and it is my own journey."

Raducanu grew into the contest after being immediately broken to love and trailing 2-0, proving particularly robust on her opponent's serve.

Bencic landed 61 per cent of her first serves yet managed only a single ace. The Olympic champion was made to work for the 23 points she won on her first serve and then took just nine of a potential 21 on her second.

Raducanu, who managed six aces of her own, added: "Of course, playing Belinda, she is such a great opponent and is in great form, she hits the ball so hard, I had to adjust and adapt and it was a really tough match.

"I am so happy to come through and thank you so much for all your support today.

"It was 0-30 in my last couple of service games so to hold was pretty big, it was one point at a time and trying to focus on what I can control.

"Belinda was going to fight to the end but I am really pleased to come through that."

Emma Raducanu's stunning run at the US Open went on as she claimed the biggest scalp of her career against Belinda Bencic to reach the semi-finals, making history in the process.

Raducanu is the first qualifier in the Open Era to advance to the last four at Flushing Meadows and is sensationally still yet to drop a set, this time overcoming the Olympic champion – her first career top-40 opponent – 6-3 6-4.

Now, in this US Open packed full of surprises, the 18-year-old will certainly fancy her chances against either Karolina Pliskova or Maria Sakkari.

Raducanu had lost the opening two games against Shelby Rogers in the previous round but then won 12 of the remaining 13. She would have been prepared then for another tough start, immediately broken to love and again trailing 2-0.

The teenager soon grew into the contest and had Bencic on the back foot, able to squander an opportunity in the sixth game with a rash, rushed effort at the end of a rally but still break when her opponent double-faulted and then found the net.

Raducanu battled back from 0-30 down to hold and went after the Bencic serve again. Her ability to consistently return unsettled the more experienced player, who survived a scare after another double fault yet was beaten at the net when the next break point arrived, teed up by a staggering rally and forehand winner.

The opener was swiftly settled before Bencic gained a measure of control in the second only to be disrupted by the same issues again. A sublime Raducanu return gave her another opportunity, taken courtesy of the latest double fault.

Three-time major champion Andy Murray had told Amazon Prime that Raducanu would find it "difficult" to enjoy this match, but she cracked a smile having passed up a further opening and a wide grin then greeted the momentous clinching point.

Data Slam: Bencic beaten by Raducanu returns

This match was decided on Bencic's serve, as she became increasingly frustrated by her inability to break down Raducanu's return game. The 11th seed landed 61 per cent of her first serves yet fired in only a single ace. Bencic was made to work for the 23 points she won on her first serve and then took just nine of a potential 21 on her second.

WINNERS/UNFORCED ERRORS

Raducanu – 23/12
Bencic – 19/21

ACES/DOUBLE FAULTS

Raducanu – 6/2
Bencic – 1/5

BREAK POINTS WON

Raducanu – 3/6
Bencic – 1/5

Canadian 12th seed Felix Auger-Aliassime feels "ready to attack the biggest stages" of tennis after becoming the first male player born in the 2000s to reach a major semi-final.

Auger-Aliassime advanced to face second seed Daniil Medvedev in the semi-finals on Friday after a 6-3 3-1 walkover win over Spanish teenager Carlos Alcaraz who succumbed to an upper right leg injury after back-to-back five-set wins.

The 21-year-old Canadian, whose previous best performance at a major was reaching this year's Wimbledon quarter-finals, has defeated Alcaraz, Francis Tiafoe and 18th seed Roberto Bautista Agut on his way to the last four.

Prior to this year's Wimbledon, Auger-Aliassime had never gone beyond the fourth round at a major.

"There's one part, I'm feeling more and more confident playing in these big stages," he told ESPN. "It doesn’t get much bigger than this. When you get comfortable on this court [Arthur Ashe Stadium], everything else is a bit lower.

"I've tried to switch my mentality over the past year to try to be more consistent with my focus, my confidence and my inner self belief. I feel I've grown a lot as a person and a player and now I feel like I'm ready to attack the biggest stages of our sport."

Auger-Aliassime labelled the career milestone as "amazing", albeit coming with a "weird ending" as Alcaraz retired without any major signs of injury beforehand.

The Canadian will take on 2021 Australian Open runner-up Medvedev, who defeated Auger-Aliassime in their only previous meeting in 2018.

"He's one of the best players, he's the most solid on hard courts probably right now with [Alexander] Zverev and Novak [Djokovic]," Auger-Aliassime said during his on-court post-match interview.

"I'm going to have to play my best tennis, try to mix things up, maybe come in a lot, try to see what I can do to disturb him."

Auger-Aliassime's triumph also means two Canadians have reached the men's and women's semi-finals at the same major for only the second time, following Milos Raonic and Eugenie Bouchard at Wimbledon in 2014.

He joins Canadian teenager Leylah Fernandez who defeated fifth Elina Svitolina in three sets to continue her dream run at the US Open reaching the last four.

"It's fantastic. She's amazing," Auger-Aliassime said about 19-year-old Fernandez. "I watched her match again today, I really hope the best for her.

"She's a great person, she's got great heart. I'm really happy all her hard work is paying off. I hope we keep going."

Canadian 12th seed Felix Auger-Aliassime has progressed to his first-ever major semi-final after Spanish teenager Carlos Alcaraz's shock withdrawal in the second set of their US Open quarter-final.

Alcaraz, who had won back-to-back five-setters to reach the last eight, retired 68 minutes into Tuesday's quarter-final trailing 6-3 3-1.

The result means Auger-Aliassime, who has never won an ATP Tour title, will take on second seed Daniil Medvedev in the semi-finals on Friday.

The Spanish 18-year-old was attended to by a physiotherapist 2-1 down in the second set and was seen pointing to his upper right leg without receiving any discernible treatment.

Alcaraz had not shown any major signs of injury prior to that yet withdrew following the completion of the next game with the Canadian in control.

Beyond the unusual circumstances, the victory marks a major milestone for 21-year-old Auger-Aliassime, who joins countrywoman Leylah Fernandez in reaching this year's US Open semi-finals.

This marks the second time that two Canadians have reached the semis in the same grand slam, joining Milos Raonic and Eugenie Bouchard at Wimbledon in 2014.

Auger-Aliassime, whose best previous major result was reaching this year's Wimbledon quarter-finals, was strong on his first serve early, delivering 6-1 aces in the first set.

Leading 3-2, the Canadian broke Alcaraz at the third attempt, before both players held to give Auger-Aliassime the chance to serve for the set at 5-3.

In a dramatic game, Auger-Aliassime offered up three break points trailing 0-40, only to rally and win the game to close out the set in 44 minutes, aided by 12 winners.

The 21-year-old broke Alcaraz in the first game of the second set, before Alcaraz's premature retirement, handing the Canadian victory.

Data Slam: First of a new men's generation

Auger-Aliassime becomes the first male born in the 2000s to reach a Grand Slam semi-final, marking a new generation in men's tennis.

WINNERS/UNFORCED ERRORS

Auger-Aliassime – 15/16

Alcaraz – 9/16

ACES/DOUBLE FAULTS

Auger-Aliassime – 8/4

Alcaraz – 1/1

BREAK POINTS WON

Auger-Aliassime – 2/7

Alcaraz – 0/3

Aryna Sabalenka has ranked among the top dozen players in the world since 2018, but her grand slam results always seemed underwhelming. 

In 12 career majors heading into 2021, Sabalenka had advanced past the third round only once, a fourth-round exit at the 2018 US Open. 

Now she is into her second successive grand slam semi-final after defeating Barbora Krejcikova 6-1 6-4 Tuesday, and she said the adjustments she has made this year have paid off. 

"I think I improved my volley game, my slice game," Sabalenka told ESPN after her latest win. "I mean, I would like to say my service game [too] but today's didn't work well."

She added with a smile: "I don't know, maybe the court's a little bit smaller, I don't know, I need to check it. But, yeah, I improved a lot."

Indeed, Sabalenka won seven of eight net points (to eight of 14 for her opponent) and consistently won points on her first serve even though it did not go in as often as she would have liked. 

Sabalenka entered the match having won 82 per cent of points on her first serve in the tournament and was down to 76 per cent Tuesday as she got only 57 per cent of her first serves in the court, but that was plenty good enough to handle Krejcikova. 

She said she focussed on putting as many balls back in play as she could and believed that was the key to her victory, as her opponent had 29 unforced errors and just 14 winners. 

Though the match was rather one-sided, Sabalenka enjoyed the support of the crowd in her first time playing Arthur Ashe Stadium during the night session. 

"I really love to be in New York and the US Open, one of my favourite slams, and I'm really enjoying my game here and every second on this court," she said. 

She also knows she probably will not get the same level of fan support in the semi-final, where she will face Canadian teen sensation Leylah Fernandez. 

"She's playing well, she's moving well and the crowd here [is] for her so I would say it's like nothing to lose for her," Sabalenka said. "It's going to be interesting match and I'm really looking forward to this one."