Novak Djokovic could still win three majors next year but Gilles Simon reminded tennis fans the world number one is not "eternal" as he heads towards the end of his career.

Djokovic triumphed in three of the four majors in 2023, with September's US Open success taking him level with Margaret Court's record 24 grand slam triumphs.

Defeating Daniil Medvedev in the final, Djokovic – aged 36 years and 111 days – became the oldest winner of the men's singles title at the US Open, as well as winning a trio of majors in a year for the fourth time.

That saw him surpass Roger Federer – who won three grand slams in a year on three occasions.

Simon, though, warned that Djokovic cannot play on forever.

He told Stats Perform: "I think he can win some [majors, but] I think he's getting to an age where it is going to become difficult.

"Most of the observers want to believe that a player is eternal but none are more eternal than the others.

"I think he can win a lot next year; will he win one, two or three? Next year he can do one more big year, but I also think that it will be his last."

The 36-year-old Djokovic acknowledged the retirement speculation after his US Open victory, asking how long he can continue.

Simon likened the twilight of Djokovic's career to fellow great Federer, whose playing days were curtailed by injury and fitness issues.

"At one point like every player there's going to be a break, that was the case for Roger Federer, remember when he won in Australia at the age of 37 playing incredible tennis," Simon added.

"At Wimbledon, he could have won because he lost against Novak Djokovic on match point. Time never had a grip on him, he had never been injured, he played really well, and then all of a sudden he disappears."

Another of tennis' 'Big Three', Rafael Nadal has not played since January 18 at the Australian Open – again owing to injury problems as years of toiling on the court takes its toll on even the best.

"We have Rafael Nadal who we hope to see again next year, who got us accustomed to more traditional injuries, longer injuries and with doubts," Simon continued.

"Once again he wins the Australian Open, he wins at Roland Garros even with his history with his foot, he again has a semi-final at Wimbledon.

"We say no about Novak because he is more careful, but we said the same about Federer, he expends less energy, he has a more fluid game and technique, he preserved himself from injury.

"I think next year will be very interesting because it’s a year where he can again win, where he still has an advantage [ahead of the rest] but we saw him lose against [Carlos] Alcaraz at Wimbledon.

"I thought he would have more advantage on grass because of the experience he has compared to others and his game works so well on grass – but he is beatable."

Age has shown no sign of slowing Djokovic down yet after he lifted the Paris Masters trophy for a seventh time on Sunday, defeating Grigor Dimitrov in straight sets.

That victory marked his second hard-court ATP-1000 title of 2023, Djokovic managing multiple Masters titles in a single season for the ninth time in his career. Only Federer, having won multiple such events in a year six times in his time, can get near to that feat.

Yet Simon suggested 30 major triumphs may be out of Djokovic's reach due to the emergence of Alcaraz, who won at Wimbledon this year, and a gruelling schedule.

"He's so strong he knows how to prepare himself, but he can't do a series of tournaments," said the Frenchman, who won 14 career titles and reached a high of number six in the ATP rankings.

"If everything was going well he would be playing every week like when he was 25 years old, so that is what is missing.

"He looks after himself, ultra-professional and very strong. The US Open was important for him, I see him maybe doing one or two next year, but I am waiting to see for the next few years after that.

"I can't see him reaching 30 [majors] for example when Carlos Alcaraz could win two or three a year – I wish it for him but I don't see it like that."

The Rolex Paris Masters became the first Masters 1000 to broadcast its qualifying matches on Twitch, live on Rivenzi's channel.

Gilles Simon has warned that Carlos Alcaraz dominating men's tennis is no certainty.

Alcaraz has enjoyed a stunning rise to the top of the rankings over the past two seasons, with the 20-year-old winning two grand slam titles and 12 trophies overall.

The Spaniard has not won a title since triumphing at Wimbledon in July, however, and has reached only one final since then, losing to Novak Djokovic at the Western & Southern Open in August.

A shock defeat to Roman Safiullin at the Paris Masters this week has damaged Alcaraz's chances of pipping Djokovic to the year-end world number one, and Simon does not feel he is a shoo-in to be the standout player of the next generation.

"There are a lot of people who say: 'He's going to win 20 Grand Slams'," Simon told Stats Perform.

"It's long a career. People say he has got the freeway ahead of him. Yes, but we do not know what's behind him? 

"When [Roger Federer first arrived, we thought he was going to win a lot, and he did. Breaking [Pete] Sampras' record, we were sure of it.

"But the danger came from behind. First Rafa [Rafael Nadal] then Novak, then Andy [Murray]. And I think it will be the same for Carlos. The danger will come from behind."

Simon, who won 14 career titles and reached a high of number six in the ATP rankings, pointed to the likes of world number four Jannik Sinner and number three Daniil Medvedev, though the latter is seven years Alcaraz's senior.

"There are players aged 16, 17, who are playing extremely well and who may also have a similar career path. In the end, he still has Novak and hyper-stable, hyper-strong players like Daniil on hard court or other players on clay who can really cause him problems," Simon continued.

"Sinner and so on, but he may also have two or three guys behind him who, in two or three years' time, we don't know who they are yet, but they'll be up there like him, and we'll be saying to ourselves: 'Ah well, he never had that period when he was supposedly going to win everything with no competition in front of him'.

"There is never no competition. The other players, even if they are not the calibre of Federer or Nadal, they are very strong. Daniil is very strong, very stable on hard court, so he can beat [Alcaraz].

"Carlos seems to have the upper hand. But no, Daniil finds a solution, comes up with something else and beats him. And that is why it's never a foregone conclusion, and why it's so interesting to follow. Otherwise, we would not even be watching the match."

The Rolex Paris Masters became the first Masters 1000 to broadcast its qualifying matches on Twitch, live on Rivenzi's channel.

Birmingham manager Wayne Rooney is adamant he does not want VAR in the Sky Bet Championship despite his side being denied a clear penalty in their 3-1 defeat by Southampton.

Gavin Bazunu wiped out Oliver Burke just before half-time when the score was 2-0 but referee David Webb waved away the spot-kick shouts.

Instead, Taylor Harwood-Bellis, Carlos Alcaraz and Adam Armstrong’s goals condemned Rooney to his third straight defeat as Blues boss.

“These decisions happen when you don’t have VAR,” said Rooney. “I’m not a fan of VAR and you accept referees and linesmen might make mistakes but what you can’t accept is the penalty decision.

“It is ridiculous and everyone in the stadium could see it.

“The keeper is committed and is coming at pace and is reckless. If he is coming like that then he has to win the ball but he absolutely wipes out Burkey.

“The most frustrating thing is that the fourth official told me that the referee was clear in his decision and wasn’t willing to take advice from his fourth official and assistant.

“He was clear there was minimal contact. That is a worry for me.

“I hope VAR doesn’t filter down but we would have got a penalty if VAR was here.

“I know referees will make mistakes, I can accept that but for me that was too much and a big error.”

Southampton manager Russell Martin agreed, saying: “I haven’t seen it back but at the time I thought it was a penalty.

“I feel for Wayne and if he’s frustrated with that I would be as well.

“It was a moment of madness from Gav. He hadn’t had a lot to do at that point.”

Saints opened the scoring in the ninth minute when Harwood-Bellis nodded in his first goal for the club from Adam Armstrong’s cross.

Alcaraz added a second from close range after fine work from Kamaldeen Sulemana and Stuart Armstrong.

Jay Stansfield wonderfully bent in his fourth goal of the season 52 seconds after coming off the bench but Adam Armstrong settled things with his eighth career goal against Birmingham.

Rooney added: “I thought Southampton were the better team and there are no complaints that they won the game.

“For where we are at, we could have come away from this game with something. There are positives for coming to the best team in the league at playing football but there is still a lot for us to work on.”

It was Southampton’s sixth game unbeaten and Martin said: “It has been a really nice run, especially after the run that came before that.

“That probably makes me more proud of the players and the staff for the way they came through that. It has been beautiful to see the growth in that time.

“To see them smiling together and fighting for each other, it has been brilliant to be a part of it.

“We played some beautiful stuff in the first half with so much energy and aggression, without giving them much threat.

“I’m annoyed we conceded the goal as Gavin deserved a clean sheet.

“We deserved to win and should have scored a few more goals, so there is a bit of frustration but I’m there to be relentless with the lads.

“It has been a brilliant week for us and now we have to keep going.”

Adam Armstrong scored his eighth goal of the season as Southampton eased to a 3-1 Sky Bet Championship victory and condemned Wayne Rooney to a third straight defeat as Birmingham manager.

Forward Armstrong now has eight career goals against Blues, more than he has scored against any other side, as he settled the game with a fine finish.

He had set up Taylor Harwood-Bellis’ opener before Carlos Alcaraz tapped in – both players’ first goals of the season. Jay Stansfield pulled one back for the visitors but it could not help end Rooney’s winless run.

Southampton had monopolised the opening stages without creating anything clear-cut until Harwood-Bellis nodded in the ninth-minute opener.

Armstrongs Stuart and Adam worked a short-corner routine before the latter lifted for the Manchester City loanee to power in his third professional goal, and first since last September.

Blues rallied but Oliver Burke’s lashed effort into the side netting – their only shot of the first half – poked the hosts back into life.

Kamaldeen Sulemana and Stuart Armstrong linked up smartly on the left flank before the Ghanaian slid across the face of the goal for Alcaraz to push in.

Rooney had been booed after Wednesday’s 2-0 home defeat by Hull, and Saints supporters rubbed their advantage in with a round of “sacked in the morning” aimed at the Manchester United great.

But rather than rub further salt into the wound of Rooney’s poor start, Birmingham fans supported their boss with cries of “Rooney, Rooney” and “Wayne Rooney’s Blue Army”.

Their support should have been rewarded with a spot-kick but goalkeeper Gavin Bazunu got away with flattening Burke in the box.

Saints should have gone into the break with more than a two-goal advantage as Harwood-Bellis’ free header from a corner skipped wide and Adam Armstrong clipped a one-on-one over John Ruddy but wide of the goal.

After the break, Stuart Armstrong tamely ended a well-worked move and Adam Armstrong’s diving header flashed wide.

But the hosts floundered and Blues capitalised. Stansfield jumped off the bench, met Lukas Jutkiewicz’s knockdown, bullied his way past Kyle Walker-Peters and rifled into the top corner – all within 52 seconds of his 57th-minute introduction.

It was Stansfield’s fourth goal of the season and extended Southampton’s wait for a home clean sheet to 28 matches.

But Saints held onto the ball well and made sure of the result in the 86th minute when top-scorer Adam Armstrong pounced and swivelled onto Sam Edozie’s nod down.

Scott Hogan curled one onto the roof of the goal in additional time but it could not stop Saints moving to a sixth game unbeaten to cement their place in the play-off spots.

Feliciano Lopez has doubts whether Spain's golden generation led by Rafael Nadal and Carlos Alcaraz will ever be replicated.

With Nadal's glittering career nearing its end, the torch for Spanish tennis has been passed on to Alcaraz, who at just 20 has already won Wimbledon and the US Open.

The pair have now combined for over half of Spain's grand slam titles, and while Lopez feels his nation will have more success in the future, the former world number 12 has concerns whether it will match the levels that Nadal produced. 

"I believe that we are not going to experience the generation of Spanish tennis players that we lived through again," Lopez told Stats Perform. "People have to be clear about that.

"But that does not mean that there will not be other great tennis players that will represent the country very well in the coming years.

"I don't know Spanish tennis in the minor categories, beyond some names that have been told to me, but I know that there are kids of 16 or 17 who play well.

"In the end, I think Spanish tennis has been in a place that is very difficult to get back to, but I'm sure that apart from Carlitos, there will be other young players who will bring us joy during the next four, five or six years."

Alcaraz has reached at least the semi-finals in the last four grand slam tournaments he has played, winning two of them, and Lopez has faith that he can carry the torch for Spanish tennis once Nadal calls it a day.

"Spanish tennis is in the hands of Carlitos and when Rafa announces his retirement, the entire country will want him to win," Lopez added. 

"He has already won two grand slams and has been number one. It is a blessing to have a player like Carlos at a time when Rafa has a year left to retire."

Nadal's decorated career has coincided with a great era of Spanish sport, with the nation's male and female football teams both winning World Cup titles while they have also enjoyed success in the likes of basketball and motorsport.

Lopez takes pride in his country's sporting achievements, explaining: "A country like Spain that is not a world power, and sport does not have the aid that neighbouring countries invest, in the last 20 years, has not stopped winning titles in all disciplines: Tennis, football, and basketball."

Carlos Alcaraz paid tribute to new Real Madrid star Jude Bellingham following his quarter-final victory at the US Open.

The defending champion spread his arms wide, mimicking England midfielder Bellingham’s goal celebration, after beating Alexander Zverev in straight sets on Wednesday night.

Alcaraz posted a picture on X, formerly known as Twitter, captioned “Hey Jude!”, and tagged Bellingham.

His fellow 20-year-old responded on Thursday morning, writing: “Que maquina! (What a machine) Keep going mate.”

Alcaraz is a fan of Real and spoke earlier in the tournament about his admiration for Bellingham, who has hit the ground running in LaLiga with five goals in his first four games.

“I’m really happy to watch him play at Real Madrid,” said Alcaraz. “He’s such a great, talented player, one of the best in the world.

“I’m sure that he’s going to be the best player in the world in that position. I’m just really, really happy to have him in the team. I talk a little bit with him. He’s such a great person, as well.”

Carlos Alcaraz is one step closer to defending his US Open title after beating Alexander Zverev to reach the semi-finals.

He will face Daniil Medvedev, who warned a player might “die” during his win over Andrey Rublev as New York sizzled in 90-degree heat and energy-sapping humidity.

Aryna Sabalenka flexed her muscles as the incoming world number one by beating Chinese youngster Zheng Qinwen, while Madison Keys stunned Wimbledon champ Marketa Vondrousova.

Here, the PA news agency looks back at day 10 at the US Open.

Pic of the dayMatch of the day

The women’s doubles provided the most drama as Laura Siegemund and Vera Zvonareva beat Victoria Azarenka and Beatriz Haddad Maia 5-7 7-5 6-4 in an epic match lasting three hours and 12 minutes.

Stat of the day

Quote of the day

Brit watch

Joe Salisbury and America’s Rajeev Ram are in the semi-finals of the men’s doubles.

The defending champions, looking for a third consecutive title in New York, face second seeds Ivan Dodig and Austin Krajicek.

Five-time champions Alfie Hewett and Gordon Reid are into the men’s wheelchair doubles semi-finals.

Fallen seeds

Men: Andrey Rublev (8), Alexander Zverev (12).
Women: Marketa Vondrousova (9), Zheng Qinwen (23).

Who’s up next?

The women’s semi-finals take centre stage with Coco Gauff taking on 10th Czech seed Karolina Muchova and new world number one Sabalenka, of Belarus, facing the second American in the last four, Keys.

Carlos Alcaraz moved a step closer to defending his US Open title after sweeping past Alexander Zverev to reach the semi-finals.

The Spanish world number one became the second man in the Open era, behind Andre Agassi, to reach the last four at Flushing Meadows three times before turning 21.

Alcaraz, looking to do the Wimbledon and US Open double, will face Russian third seed Daniil Medvedev in Friday night’s semis and remains on course for another final showdown with Novak Djokovic, who he beat in July’s epic SW19 showpiece.

Zverev, the German 12th seed, has proved he is back at the top of the sport this fortnight after eight months out following the horror ankle injury he suffered against Rafael Nadal at last year’s French Open.

But the 2020 runner-up was unable to halt the Alcaraz juggernaut in a 6-3 6-2 6-4 defeat inside Arthur Ashe Stadium.

The first set was evenly poised on serve at 3-3 when Alcaraz, by no means at his electric best, took control of the match.

He won six of the next seven games to go a set and a break up, and Zverev needed a medical time-out after Alcaraz, clapping sawdust onto his hands to get a better grip of his racket on a horribly humid night, moved two sets ahead.

Zverev forced two break points at 2-2 in the third, but when they disappeared his chances went with them as Alcaraz broke for 5-4 and served out for the victory in two hours and 29 minutes.

“To see him in the quarter-finals of a grand slam playing at his best, I’m so happy,” said Alcaraz of his opponent.

“We enjoy his game and we are really happy to have him back.”

The 20-year-old added: “I’m feeling comfortable playing in this court, playing in New York.

“I’m showing my best level. I’m feeling good physically and ready for a good battle in the semi-final.”

Carlos Alcaraz moved a step closer to defending his US Open title after sweeping past Alexander Zverev to reach the semi-finals.

The Spanish world number one became the second man in the Open era, behind Andre Agassi, to reach the last four at Flushing Meadows three times before turning 21.

Alcaraz, looking to do the Wimbledon and US Open double, will face Russian third seed Daniil Medvedev in Friday night’s semis and remains on course for another final showdown with Novak Djokovic, who he beat in July’s epic SW19 showpiece.

Zverev, the German 12th seed, has proved he is back at the top of the sport this fortnight after eight months out following the horror ankle injury he suffered against Rafael Nadal at last year’s French Open.

But the 2020 runner-up was unable to halt the Alcaraz juggernaut in a 6-3 6-2 6-4 defeat inside Arthur Ashe Stadium.

The first set was evenly poised on serve at 3-3 when Alcaraz, by no means at his electric best, took control of the match.

He won six of the next seven games to go a set and a break up, and Zverev needed a medical time-out after Alcaraz, clapping sawdust onto his hands to get a better grip of his racket on a horribly humid night, moved two sets ahead.

Zverev forced two break points at 2-2 in the third, but when they disappeared his chances went with them as Alcaraz broke for 5-4 and served out for the victory in two hours and 29 minutes.

“To see him in the quarter-finals of a grand slam playing at his best, I’m so happy,” said Alcaraz of his opponent.

“We enjoy his game and we are really happy to have him back.”

The 20-year-old added: “I’m feeling comfortable playing in this court, playing in New York.

“I’m showing my best level. I’m feeling good physically and ready for a good battle in the semi-final.”

Dan Evans pushed world number one Carlos Alcaraz all the way before bowing out of the US Open following a breathtaking third-round match.

The defending champion had to dip into his armoury of explosive winners to finally see off the British number two inside Arthur Ashe Stadium.

The last time Evans played the top-ranked player he rose to the occasion, beating Novak Djokovic in Monte Carlo three years ago.

And the 26th seed brought the very best out of the 20-year-old Wimbledon champion before succumbing 6-2 6-3 4-6 6-3.

Alcaraz dominated the first set, constantly pushing his opponent to the back of the court and hitting 14 winners to Evans’ four.

But he showed he is not infallible at the start of the second after a double-fault gave Evans, who was beginning to relish the challenge, a break point which he converted with a superb backhand down the line.

Alcaraz quickly retrieved the break and a frustrated Evans was given a code violation after slicing the ball into the crowd after netting a volley at 15-30 up on the Spaniard’s serve.

Evans was playing well, but Alcaraz simply raised his level and brought up set point with a blistering forehand down the line which brought gasps from the spectators.

Evans saved that one, but could do nothing with the next after an exquisite lob and simple volley put Alcaraz two sets up.

Never one to give up without a fight, Evans promptly played one of the best sets of his career.

He broke for 4-3 and, serving for the set, forced Alcaraz into some of the most outrageous clutch winners.

The pair, who played golf together at Wimbledon, frequently exchanged knowing looks and grins, such was the quality of the cat-and-mouse tennis on show.

It took Evans, 33, five set points to make the breakthrough, prompting a suddenly exasperated Alcaraz to slam his racket down in frustration.

But Alcaraz turned the match back in his favour with another stunning shot on break point. On the run and at full stretch, he unleashed a forehand down the line which clipped the baseline and left Evans stood, hands on hips, in sheer disbelief.

Two aces, another sensational lob onto the baseline and a 61st winner of the match finished Evans off, but Alcaraz knew he had been in a contest.

“He’s a tricky opponent, great slices, good touch and it’s my game as well so it was a pretty good match,” said Alcaraz.

“We made great points, great shots, a lot of different situations, so I’m really happy to get through

“We played some great points that made us smile, Dan as well. It’s great to see Dan and I on a tennis court, we tried to entertain and make the match fun.”

Andy Murray bowed out of the US Open, but it was still a successful day for British tennis.

Jack Draper, Katie Boulter, Cameron Norrie and Dan Evans all kept the flag flying into the third round, although Jodie Burrage came up short against second seed Aryna Sabalenka.

Defending champion Carlos Alcaraz beat Lloyd Harris in straight sets and he will face Evans next.

Here, the PA news agency looks back at day four at Flushing Meadows.

Pic of the dayShot of the day

No contest.

Brit watch

Murray was desperately disappointed with how he played as he went down in straight sets to a familiar rival, Grigor Dimitrov. It was a 12th meeting of the pair and the Bulgarian 19th seed picked up his fourth win.

Norrie was a straight-sets winner against Hsu Yu-hsiou of Chinese Taipei and Evans came from a set down to beat Dutchman Botic van de Zandschulp in four.

Propably most impressive was Draper, who dispatched 17th seed Hubert Hurkacz of Poland 6-2 6-4 7-5.

Lucky escape

Boulter was relieved to avoid being defaulted after inadvertently hitting a ball towards spectators during her win over Wang Yafan.

The British number one had just lost a 20-shot rally in the first set when a ball kid threw her the ball and she swatted it away, accidentally sending it spinning into a gangway in front of the crowd.

Had the ball hit a spectator Boulter would have been disqualified, but the chair umpire merely issued a code violation for ball abuse.

Boulter went on to complete a 5-7 6-1 6-4 victory and will play American Peyton Stearns in round three.

Stat of the dayNo boos

The USTA put an announcement on the big screen explaining there would be no handshake between Ukraine’s Elina Svitolina and Russian Anastasia Pavlyuchenkova due to ‘global events’. It had the desired effect as there was no booing of either player, unlike at Wimbledon when Victoria Azarenka got it in the neck.

Fallen seeds:

Hubert Hurkacz (17)

Who’s up next?

Novak Djokovic continues his bid for a record-equalling 24th grand slam title against fellow Serbian Laslo Djere.

Defending champion Iga Swiatek faces her good friend, Slovakian qualifier Kaja Juvan.

Carlos Alcaraz had mixed emotions after being gifted a route into the second round of the US Open because his opponent retired injured.

Dominik Koepfer rolled his ankle in the opening game of the match and needed a medical time out to have it heavily bandaged.

He valiantly carried on, at one point telling the chair umpire: “I’m trying not to retire after 20 minutes because of freaking 20,000 people in the stadium.”

But the 29-year-old was clearly in a lot of pain and called it a night with Alcaraz leading 6-2 3-2.

Defending champion Alcaraz said: “Obviously I want to play battles. I want to play the full matches. This is not the best way to win a match.

“But obviously, playing the night session, I’m happy to come back early, have some rest. Well, a little bit more than I expect before starting the match.

“It’s going to be better for me to recover into the next round.”

Alcaraz’s new sleeveless look drew more comparisons with his fellow Spaniard Rafael Nadal and his US Open victory in 2019.

“I was thinking about Rafa when he wore that. He won that US Open, right?” added the 20-year-old.

“I love to wear that sometimes in some specific tournaments. Here in the US Open, I was supposed to play last year. This year it’s a good, good outfit, so I love it.”

Daniil Medvedev, the 2021 champion, dropped just two games as he rolled over 34-year-old Hungarian Attila Balazs.

Alexander Zverev, the runner-up in 2020, is also through to the second round with a straight-sets win over Australian Aleksandar Vukic.

Cameron Norrie turned to defending champion Carlos Alcaraz to help him into the second round at the US Open.

The British number one practised with the world number one on Monday before dismantling Alexander Shevchenko of Russia 6-3 6-2 6-2.

It was just the sort of performance Norrie needed after losing his previous three matches on the hard courts.

And the 16th seed credited Spanish superstar Alcaraz for his improved display.

“We had a really good practice and I think it really set the tone yesterday and I was able to put it into my match today,” he said.

“He’s always enjoying the practice and bringing a lot of flair and excitement to the practice court.

“It was not an easy match. Shevchenko has had a good year so far. I know his game quite well, I’d practiced with him a few times.

“I was able to play longer points and win some of the tough games. It was a nice match to play in the first round to get a lot of rhythm.”

Norrie will face qualifier Yu Hsiou Hsu, the world number 237, in round two after his surprise win over Australian Thanasi Kokkinakis.

Novak Djokovic has had his fair share of rivalries over his career but says the latest, with Carlos Alcaraz, is bringing the very best out of him.

Djokovic begins his quest for a 24th grand slam title at the US Open on Monday having already eclipsed the totals of his illustrious peers, Roger Federer and Rafael Nadal.

But the man likely to be standing in his way is Alcaraz, the defending champion who beat Djokovic in the Wimbledon final last month.

Djokovic got a measure of revenge when he outlasted the 20-year-old Spaniard in a near four-hour final in Cincinnati a week ago.

The duo may be at the opposite end of their careers but they have already built a rivalry which looks set to endure for as long as Djokovic, 36, continues to pick up a racket.

“He’s always pushing me to the limit,” said the Serbian. “I think I do to him pretty much the same thing. That’s why we produced a memorable final.

“It was one of the best, most exciting, and most difficult finals I was ever part of in best-of-three, no doubt, throughout my career.

“That’s why I fell on the ground after I won the match because it felt like winning a grand slam, to be honest. The amount of exchanges and rallies. It was physically so demanding and gruelling that I felt very exhausted for the next few days.

“Those are kind of the moments in matches that I still push myself on a daily basis, day in and day out, practice, sacrifice, commitment. At 36, I still have the drive.”

If Djokovic wins his first-round match, against Frenchman Alexandre Muller, he will overtake Alcaraz to become world number one again.

Alcaraz, the top seed, starts his campaign on Tuesday against Dominik Koepfer of Germany.

Iga Swiatek opens proceedings on Monday against Rebecca Peterson of Sweden as she bids to defend the title she won last year.

“On one hand you always want to kind of take experience from last year, find all these positive things that happened, take strength from that,” said the world number one from Poland.

“On the other hand you have to remember that it’s a totally different story. A lot can happen during like these 12 months.

“So I try to take everything step by step, not really go forward with my thoughts, think that I need to do something more because last year I won.”

World number one Carlos Alcaraz defeated Tommy Paul in a three-set thriller to reach the quarter-finals of the Western and Southern Open in Cincinnati.

Wimbledon champion Alcaraz outlasted the American 7-6 (6) 6-7(0) 6-3 in a gruelling contest that lasted more than three hours.

The Spaniard suffered a three-set defeat against the American in the quarter-finals at the Toronto Masters last week.

Paul got the first break to lead 4-2, before Alcaraz rallied to bring up the tie-break, which he eventually claimed 8-6.

The second set proved another tight affair, with both players losing three service games at 5-5.

Paul saved three match points in a marathon 12th game which lasted more than 15 minutes to go into another tie-break.

This time, though, the American took control after an early mini-break to race into a 3-0 lead before then sweeping it to love.

Alcaraz broke in the first game of the deciding set, which he was leading 4-3 when rain forced play to be suspended after three hours and two minutes of a pulsating contest.

Following a delay of around an hour, the players headed out on court – but the match was soon paused again as the drizzle returned along with strong winds before the pair went off back inside.

When they were finally able to return to the court, Alcaraz picked up where he left off, clinching the next two games and sealing a trip to the quarter-finals.

Earlier on Thursday, Alexander Zverev battled past world number three Daniil Medvedev 6-4 5-7 6-4 to end a four-match losing streak against the Russian.

Stefanos Tsitsipas, the fourth seed, is out after he was beaten 6-3 6-4 by Poland’s Hubert Hurkacz, who recorded a first win over a top-10 ranked player in six matches.

Hurkacz goes on to play lucky loser Alexei Popyrin after the Australian earlier defeated Emil Ruusuvuori 6-2 1-6 6-3 to reach his first ATP Masters 1000 quarter-final.

Zverev will face Adrian Mannarino in the last eight. The Frenchman progressed after American wildcard Mackenzie McDonald retired during the second set of their third-round match, with Mannarino ahead 6-4 3-0.

The run of veteran Swiss Stan Wawrinka – who had been given a wildcard entry and knocked out 10th seed Frances Tiafoe in the last round – was ended with a 6-4 6-2 defeat by qualifier Max Purcell.

The Australian, who upset world number seven Casper Ruud on Wednesday, will next face Alcaraz.