Carlos Alcaraz will miss the ATP Finals and the Davis Cup Finals after his season was cut short by an abdominal injury.

The world number one suffered an internal oblique muscle tear during a Paris Masters quarter-final against Holger Rune on Friday.

Alcaraz retired early in a second-set tie-break after losing the opening set 6-3 in the French capital.

The US Open champion on Saturday revealed it will take him six weeks to recover from the injury, so Taylor Fritz will take his place in the ATP Finals in Turin next week.

Teenager Alcaraz will also be unavailable for Spain's bid to win the Davis Cup on home soil, with the prestigious event getting under way on November 22 in Malaga.

He posted on Instagram: "After my withdrawal yesterday and having been evaluated by my medical team, Dr Juanjo Lopez and Juanjo Moreno, unfortunately this is the result of my injury: an internal oblique muscle tear in the left abdominal wall with an estimated recovery time of six weeks.

"Unfortunately I won't make the ATP Finals or the Davis Cup Finals. It is tough and painful for me to miss these two events, which are so important to me, but all I can do is be positive and focus on my recovery. Thank you for the support!"

The 19-year-old became the youngest player to top the ATP rankings after winning his maiden major title at Flushing Meadows in September and ends a magnificent season with a record of 57 wins and 13 defeats.

He has won five ATP Tour titles in 2022, with Masters 1000 triumphs in Miami and Madrid along with his finest hour in New York.

Novak Djokovic outclassed Lorenzo Musetti to reach the Paris Masters semi-finals after Carlos Alcaraz retired due to an abdominal injury.

Djokovic moved into the last four of a Masters 1000 event for a staggering 74th time with a commanding 6-0 6-3 victory over Musetti on Friday.

The defending champion will do battle with Stefanos Tsitsipas for a place in the final as he eyes a seventh Paris Masters title.

Sixth seed Djokovic made only 10 unforced errors and broke five times, not allowing his Italian opponent to have a game point until early in the second set.

The 21-time grand slam champion only needed 74 minutes to dispatch the unseeded Musetti, moving two victories away from a fifth title of the season.

Meanwhile, world number one Alcaraz's participation in the ATP Finals next week is in doubt after he was injured in his quarter-final against Holger Rune.

Rune won the first set 6-3 and the Dane was 3-1 up in a second-set tie-break when US Open champion Alcaraz brought the match to a premature end.

As Alcaraz prepares to discover whether he can play in the season-ending tournament in Turin, Rune can look forward to facing Felix Auger-Aliassime in his maiden Masters 1000 semi-final.

Auger-Aliassime beat Rune to take the title in Basel last weekend and the Canadian stretched his winning run to 16 matches by beating Frances Tiafoe 6-1 6-4.

Tsitsipas was the last man to seal his place in the semi-finals, getting the better of Tommy Paul, who beat Rafael Nadal earlier in the week, 6-2 6-4.

Carlos Alcaraz is unsure if he will be fit for the ATP Finals after the world number one retired from the Paris Masters due to an abdominal injury.

The world number one cut short his quarter-final against Holger Rune in the French capital during a second-set tie-break after he lost the opener 6-3 on Friday.

Alcaraz stated after his retirement that it is too early to say whether he will be able to play in the prestigious season-ending tournament in Turin which starts on November 13.

The US Open champion said: "I don't know if I'll make it to the Masters Cup [ATP Finals]. Right now I have to do some tests to see how I am before going to Turin.

"I am focused on trying to improve my abdomen and trying to be 100 per cent in Turin."

The Spaniard felt there was no point in taking any chances.

He added: "At the end of the set, I felt bad. My abdomen was getting bad and I preferred to retire to see it and take care of it.

"I can't stretch. I couldn't serve well, I couldn't hit my forehand and when I turned the body I feel pain, I feel the abdomen in all the movements.

"I was playing thinking about it and feeling the pain, so it was better to withdraw."

Rune will face Felix Auger-Aliassime in his first ATP Masters 1000 semi-final, with both players finishing the season strongly.

Auger-Aliassime beat Frances Tiafoe 6-1 6-4 for his 16th consecutive win to set up a repeat of a final in Basel that the Canadian won last weekend.

Novak Djokovic remained on course for a record-extending seventh Paris Masters title after booking his quarter-final place with victory over Karen Khachanov.

The six-time champion avenged his defeat by Khachanov in the 2018 Championship match by running out a commanding 6-4 6-1 winner.

That gave Djokovic his 11th straight victory in the French capital, where he is unbeaten since that 2018 defeat, while he has also won each of his last 11 Tour-level matches.

The Serbian, who has triumphed in Tel Aviv and Astana during that streak, set up a last-eight clash with Lorenzo Musetti after the Italian came from behind to stun third seed Casper Ruud 4-6 6-4 6-4.

The Naples champion recorded his maiden top-five victory at the seventh attempt, while he hit 37 winners to advance to his first ATP Masters 1000 quarter-final.

Meanwhile, world number one Carlos Alcaraz won five out of seven break points as he breezed past Grigor Dimitrov 6-1 6-3 to reach the last eight in Paris for the first time.

There, he will play Holger Rune after the Stockholm champion defeated seventh seed Andrey Rublev in straight sets.

Fifth seed Stefanos Tsitsipas overcame Corentin Moutet 6-3 7-6 (7-3) to reach his 14th quarter-final of the season, where he will face Tommy Paul after the American denied Pablo Carreno Busta 6-4 6-4.

Felix Auger-Aliassime was a commanding 6-1 6-3 victor over Gilles Simon. The eighth seed will take on Frances Tiafoe, who defeated Alex De Minaur 6-3 7-6 (7-5).

Rafael Nadal joined Daniil Medvedev in making a shock early exit from the Paris Masters on Wednesday.

While world number one Carlos Alcaraz overcame Yoshihito Nishioka 6-4 6-4 to progress to the last 16, there was no such luck for compatriot Nadal, whose chances of ending the year at the top of the ATP rankings are over after a defeat to Tommy Paul.

World number two Nadal looked well set to progress after claiming the first set 6-3 in just over 40 minutes, yet American Paul rallied to seal the biggest win of his career 3-6 7-6 (7-4) 6-1.

The 22-time grand slam champion said on Tuesday that he is no longer concerned with competing for the top spot in the world, though he will no doubt be frustrated at bowing out at the first hurdle ahead of the ATP Finals later this month.

Paul became the first player to defeat Nadal prior to the quarter-finals of the tournament when he sent a controlled backhand volley away from the forlorn 36-year-old.

Nadal was not the only big-name exit, with world number three Medvedev also slumping to defeat, going down 6-4 2-6 7-5 to Alex de Minaur.

For Australian De Minaur, it was his first win in 19 attempts against a player ranked in the top five and sets up a third-round clash with Frances Tiafoe, who beat Jack Draper.

"It's a good one to get, for sure," said De Minaur. "It's the end of the year, everyone's a bit tired, but I'm very proud of my performance. I just played very smart.

"I knew it was going to be a chess match out there, both baiting each other to be aggressive, but you also didn't want to be too aggressive at times. It was an absolute battle and I'm very happy I was able to come out on top."

It leaves the path open for Alcaraz to retain his place as the world's best player, and the 19-year-old said after his win: "First round in every tournament is never easy.

"You have to be really focused, you have to try to get a good rhythm, good feeling in the first round. I'm really happy with the performance, the level that I played, and I'm looking forward to getting better in the next round."

Ninth seed Taylor Fritz and 10th seed Hubert Hurkacz lost to Gilles Simon and Holger Rune respectively, their defeats ensuring Felix Auger-Aliassime, who overcame Mikael Ymer, and Andrey Rublev will feature in the ATP Finals.

Auger-Aliassime's victory took three hours and 30 minutes, and marked his 14th win in a row.

"Somehow I found a second wind after saving those break points at 4-1," said the Canadian.

"I played better and better, coming through the court much better, serving better. It was pretty epic. Three hours and 30 minutes on the court, quality rallies. He was making me work all the time. Definitely a win to remember."

Fifth seed Stefanos Tsitsipas was also a winner, seeing off Daniel Evans in straight sets.

Rafael Nadal is not treating the Paris Masters as a chance to fight for a place at the top of the ATP rankings.

Nadal has played only once – alongside the now-retired Roger Federer at the Laver Cup – since he was knocked out in the fourth round of the US Open by Frances Tiafoe.

The 36-year-old has won two grand slam titles in 2022, at the Australian Open and the French Open, seeing him sit one clear of Novak Djokovic when it comes to the record amount of major triumphs.

Yet it is Nadal's fellow Spaniard Carlos Alcaraz, some 17 years his junior, who sat top of the world rankings ahead of the Paris Masters and the season-ending ATP Finals in Turin.

Nadal could yet end the year at the summit, but to overtake Alcaraz he would likely need a deep run at the Paris Masters – one of two ATP 1000 tournaments he is yet to win in his illustrious career – and in northern Italy.

However, Nadal, who became a father last month, says he now has a much simpler aim than becoming the best player on the planet.

"To be clear, I understand it's an interesting point because you're talking about fighting for number one, [but] I don't fight any more to be world number one," Nadal said in a press conference on Tuesday, a day ahead of his opening match against Tommy Paul in the French capital.

"I just fight to keep being competitive in every event that I play. It's something I said a long time ago, I will not fight any more to be number one.

"I did in the past. I achieved that goal a couple of times in my career and I have been very, very happy and proud about achieving that. But I am at a moment in my tennis career where I don't fight to be number one.

"I'm just excited to be here. I'm here to try my best and then accept things how they are coming. Hopefully, I will be ready, I'm going to try to be competitive. Let's see. I'm excited about it."

Having dominated the game for so long, Nadal and reigning Paris Masters champion Djokovic find themselves ranked at second and seventh by the ATP respectively.

Nadal and Djokovic are the only players in the top 10 aged over 30, with four of the other eight players aged under 25.

"My feelings are that I am proud of all the things that I was able to still be here in 2022," Nadal said, when asked what it was like to be competing against the next generation of talent.

"It's something that says that I did a lot of things well in my life, not only my tennis career. To hold the passion, to hold the love for the game and fighting spirit.

"I'm proud of that and just hope that I can enjoy the last two events of the year."

With his son not yet a month old, Nadal conceded he is missing home.

"[A] different approach to usual. It has always been difficult to leave home, to be honest," he said.

"It's quite interesting how even after two or three weeks you leave your son at home and [are] not be able to go see him. It's something quite interesting how even after only three weeks of knowing him you start missing him.

"So yeah, a new experience, all changes are difficult in his life, and you need to adapt to it."

Carlos Alcaraz views fellow Spaniard Rafael Nadal as another competitor and "not my enemy", despite the pair's battle for top spot in the world rankings.

The 19-year-old continues to break records at the top table in tennis, becoming the first teenager to be crowned world number one in the Open Era.

Alcaraz, aged just 19 years and 129 days, also set a new benchmark as the youngest number-one ranked male player in the world since rankings were published in 1973.

Those feats came after winning September's US Open, where he joined Arthur Ashe (1968) and Rod Laver (1969) as the only Open Era players to win on their first or second main-draw outing at the tournament.

Now, Alcaraz has Nadal – a record 22-time major winner – chasing him for top spot, though the youngster assures there will never be bad blood between himself and his compatriot.

"I don't see it that way," Alcaraz responded to Eurosport when asked if he was embroiled in a battle with Nadal.

"It's true, Rafa is fighting for the No.1. Some players have the same goal – to be No.1, so I need to do my best. Outside the court [Rafa and I] are colleagues, at least it's the way I see it.

"Rafa is not my enemy. I say hello, I don't see that competition. With the rest of the players, it's the same. Beyond that relationship, I'll try to keep being No.1."

While Alcaraz remains the world's top-ranked male player, he intends to savour the moment after a surreal victory at the US Open.

"It is an incredible feeling, waking up as No.1, the US Open winner. It's a dream come true," he added.

"I am enjoying this moment so far. I keep working, my life is still the same, I'm still the same kid, same player. I just keep practising, keep improving."

As the teen aims to relish topping the ranks, his next focus turns to the Paris Masters – where he faces Yoshihito Nishioka on Wednesday – with a knee injury not as serious as first thought.

"It's a little pain, but the calendar is very demanding," he said of the injury. "We are playing and travelling with barely any breaks and it's normal that we have a few pains.

"All players have them and we learn how to deal with them. I am feeling good physically and I am ready to play here in Paris and in Turin in the [ATP] Finals."

World number one Carlos Alcaraz was stunned in the Swiss Indoors Basel semi-finals as Felix Auger-Aliassime set up a final clash with Holger Rune.

Auger-Aliassime saw off the US Open champion in just 82 minutes as he won 6-4 6-3 to take his unbeaten run to 12 matches.

The Canadian was in irresistible form on Saturday, with his shot placement in decisive moments proving far more consistent and lethal than his counterpart, hitting 23 winners to Alcaraz's eight.

Twenty-two-year-old Auger-Aliassime is still fighting to qualify for the ATP Finals for the first time and victory in Sunday's final will move him up to sixth in the rankings having won each of his two previous tournaments in Antwerp and Florence.

"It's amazing," Auger-Aliassime said. "I never expected it, when I was in Florence three weeks ago, or after the US Open. I'm just really happy that all my work is coming together.

"I've always believed that I can play this way, that I can be consistent in that way, but one thing is to believe and the other is to actually do it. It's nice to feel that way, it's nice to come out on the court and win that many matches in a row. So hopefully this is just the beginning of seeing me play this way."

Rune awaits after the Dane beat Roberto Bautista Agut 7-6 (7-1) 7-6 (10-8) despite being 6-2 down in the second-set tie-break. He will move into the top 20 for the first time as a result of that win.

The final of the Vienna Open will be contested by Daniil Medvedev and Denis Shapovalov, who came through their respective semis in straight sets.

Top seed Medvedev was exceptional against Grigor Dimitrov, with the Russian's serve proving especially important in his 6-4 6-2 win.

Medvedev won 87 per cent of points on his first serve to leave Dimitrov frequently struggling for momentum, and the former world number one recognised that impact.

"The serve is probably the most important shot in tennis," he said. "I was lacking it a little bit this season, I was doing too many double faults. Sometimes in important moments my serve could have been a little bit better. I was working a lot with my coach to try and find this rhythm [again], and so far I'm serving good here. I'm really happy about it and that's also why I'm playing so good."

Shapovalov ultimately romped to an impressive win over Borna Coric.

A tight first set was followed by the Croatian getting bageled as Shapovalov won 7-6 (7-4) 6-0 to reach his second final of the year.

World number one Carlos Alcaraz is through to the semi-finals of the Swiss Indoors Basel after easing past Pablo Carreno-Busta in straight sets.

Alcaraz took just under an hour and 40 minutes to overcome his fellow Spaniard and friend 6-3 6-4, getting 67 per cent of his first serves in and winning 77 per cent of those.

Carreno-Busta struggled to keep the US Open champion at bay, facing 12 break points in all, and although he saved nine of them, his defiance was ultimately in vain.

"It is difficult to play against a friend like Pablo," Alcaraz said on-court after his win on Friday. "Every day we go and have dinner, lunch, together. Every week and we train together, so it is difficult to play against him.

"I also support him and want him to win every match. On court, there are no friends. You have to be focused and go for the match and that is what I did."

Alcaraz will face third seed Felix Auger-Aliassime in the final four after the Canadian defeated Alexander Bublik 6-2 6-3.

The other semi-final will see Roberto Bautista Agut play Holger Rune after the Spaniard beat Stan Wawrinka 7-5 7-6 (7-5) and the Danish teenager defeated Arthur Rinderknech 7-6 (7-0) 6-2.

In Austria, top seed at the Vienna Open Daniil Medvedev beat Jannik Sinner 6-4 6-2 to advance to the last four, where he will play Grigor Dimitrov after the Bulgarian overcame Marcos Giron 6-3 4-6 6-4.

The winner of that contest will face either Denis Shapovalov, who beat Dan Evans 6-3 6-3, or Borna Coric after the Croatian came through against Hubert Hurkacz 6-4 6-7 (2-7) 7-6 (7-5).

Daniil Medvedev set up a second-round showdown with home favourite Dominic Thiem at the Vienna Open after defeating Nikoloz Basilashvili in straight sets on Wednesday.

The top seed broke early and late in both sets as he cruised through the opening round a 6-2 6-2 winner.

Next up for Medvedev is a clash with former US Open champion Thiem, who beat him in the semi-finals on the way to triumphing at Flushing Meadows two years ago.

Stefanos Tsitsipas overcame local wildcard Dennis Novak 7-6 (7-2) 6-2 as the Greek ace seeks a third final in as many weeks, having lifted the title in Astana and finished as runner-up to Holger Rune in Stockholm.

Jannik Sinner also advanced in straight sets against Cristian Garin, but Taylor Fritz's ATP Finals hopes suffered a blow after the fourth seed was beaten 6-1 4-6 6-3 by Denis Shapovalov.

Over in Basel, world number one Carlos Alcaraz sailed through to his 11th quarter-final of the season after a commanding 6-4 6-2 win over Botic van de Zandschulp.

Meanwhile, Felix Auger-Aliassime recovered from losing the opening set to deny Marc-Andrea Huesler. The third seed claimed a career-best ninth successive ATP Tour victory, as he looks to complete a hat-trick of titles in as many weeks having recently reigned in Florence and Antwerp.

Stockholm champion Rune built on his recent momentum with a 6-2 7-5 success over Alex de Minaur, but Naples winner Lorenzo Musetti was ousted in a deciding set by Albert Ramos-Vinolas. 

Carlos Alcaraz reached the last-16 stage of the Swiss Indoors Basel by beating Jack Draper in three sets on Monday.

The number one seed lost the opening set but responded to take the following two and win 3-6 6-2 7-5.

Alcaraz dominated at the net, winning 30 of 39 points to edge out his opponent after more than two hours.

Elsewhere, at the Vienna Open, fourth seed Taylor Fritz overcame Yoshihito Nishioka in another three-set thriller.

Nishioka took the opener, and Fritz was staring down the barrel in a second-set tie-break before trailing by a break in the decider.

However, the American won the final five games to advance 6-7 (4-7) 7-6 (9-7) 6-3.

The comeback boosted Fritz's chances of making the ATP Finals, trailing Felix Auger-Aliassime by 315 points in the Race to Turin.

Third seed Andrey Rublev found life far easier as he beat Diego Schwartzman 6-4 6-1.

Carlos Alcaraz was dumped out of the Astana Open in the first round on Tuesday, suffering a surprise 7-5 6-3 defeat to David Goffin.

Goffin entered the draw as a lucky loser after squandering two match points to lose his final qualification match against Luca Nardi on Sunday, but he produced a fine display to see off the world number one in one hour and 46 minutes. 

The Belgian had to rediscover his composure to take the opener after throwing away a 5-2 lead, but ultimately deserved his straight-sets win over the US Open champion. 

Speaking on court after his victory, Goffin said: "I always believe that I have the level to cause some trouble against those guys. 

"When you play against the world number one on a big stage, big crowd, the fire inside gives you so much power to play your best tennis because you don't have any choice."

Stefanos Tsitsipas was the only other seed in action in Kazakhstan on Tuesday, and he advanced to the round of 16 by beating home favourite Mikhail Kukushkin 6-3 6-4.

The Tokyo Open also lost its top seed, as Casper Ruud fell to a 6-3 6-3 loss to Jaume Munar, who claimed his first top-10 win since beating Alexander Zverev in 2019.

But the likes of Borna Coric and Nick Kyrgios fared better, claiming straight-sets wins over Thanasi Kokkinakis and Tseng Chun-hsin, respectively.

Wimbledon runner-up Kyrgios only dropped four further points on his serve after being forced to save a break point in his opening service game, racing to a dominant 6-3 6-1 win.

Elsewhere, eighth seed Dan Evans fought back to beat Radu Albot 6-7 (3-7) 6-1 6-4, and Alex de Minaur lost 6-3 6-2 to Kwon Soon-woo. 

Novak Djokovic does not regret missing out on the US Open due to his vaccination stance and is waiting to discover if he will be allowed to compete in the 2022 Australian Open.

The 21-time grand slam winner missed two of this year's four majors owing to his decision to not be vaccinated against COVID-19.

Though Djokovic was able to extend his record at Wimbledon, he lost joint control of the outright Open Era title for most men's single majors to Rafael Nadal, after the latter won in Australia and then at the French Open.

Carlos Alcaraz, meanwhile, won a maiden grand slam to become the new world number one with victory at Flushing Meadows earlier this month.

Djokovic was barred from entering the USA on vaccination grounds, but speaking ahead of this week's Laver Cup, the Serbian says he does not rue his choice.

"No, I don't have any regrets," he said. "I mean, I do feel sad that I wasn't able to play but that was a decision that I made, and I knew what the consequences would be. I accepted them and that's it."

Djokovic was quick to hail teenager Alcaraz, congratulating the Spaniard for his victory, and adding: "He did it in an incredible fashion. He's 19 years old and already the number one in the world.

"I think he's a great addition to our sport, a great star in the making. We can't speak about him as the future because he is already the present."

Djokovic's 2022 started in less than auspicious circumstances when, having been granted an exception to compete in Australia despite the nation's strict COVID-19 protocols, he was subsequently deported.

Questions over whether he would even be allowed back in the country remain up in the air, but the Serbian is hopeful of a reprieve.

"I'm waiting for the news," he added. "It's really not in my hands right now. So I'm hoping I can get some positive news soon."

Carlos Alcaraz fell to a defeat to fellow youngster Felix Auger-Aliassime in his first match as world number one.

Alcaraz triumphed at the US Open on Sunday, beating Casper Ruud to clinch his first grand slam title and, in the process, become the youngest world number one since the rankings were first published in 1973.

The 19-year-old is the second-youngest male player to win the title at Flushing Meadows in the Open Era, and only the third player since the majors welcomed professionals in 1968 to win the US Open title at his first or second main draw appearance after Arthur Ashe and Rod Laver (in the first two editions of the tournament).

Yet back on home soil in Spain on Friday, Alcaraz was unable to claim victory in his first match since becoming number one, as he went down 6-7 (3-7) 6-4 6-2 to Auger-Aliassime in the Davis Cup Finals.

Canada's Auger-Aliassime did not concede a break point as he dragged his country level in their tie with Spain in Valencia, teeing up a doubles decider after Roberto Bautista Agut defeated Vasek Pospisil 3-6 6-3 6-3.

Auger-Aliassime, 22, has won both of his career matches against Alcaraz, after defeating him in the US Open quarter-finals last year.