For a moment it seemed Rafael Nadal was in danger of a premature exit from the US Open against Fabio Fognini on Thursday but he steadied to improve his 2022 grand slam record to 21-0.

Nadal won the Australian Open and French Open titles earlier this year, but an abdominal injury forced him to withdraw from Wimbledon at the semi-final stage, handing Nick Kyrgios a passage to the decider won by Novak Djokovic.

The 22-time major champion is on a mission to make it three from four grand slam titles this calendar year in Djokovic's absence in New York.

The 36-year-old Spaniard will take on veteran Richard Gasquet next in the third round, whom Nadal boasts a remarkable 17-0 head-to-head record against.

Nadal's 2-6 6-4 6-2 6-1 win over Fognini also meant he became the first player to qualify for the season-ending ATP Finals in Turin too.

But the current world number three has bigger fish to fry, needing to maintain his perfect 2022 record at majors for a fifth US Open crown.

If he succeeds, Nadal will not quite claim a calendar Grand Slam - achieved only by five players in singles history in Don Budge (1938), Maureen Connolly (1953), Rod Laver (1962, 1969), Margaret Court (1970) and Steffi Graf (1988) - but he would have achieved a staggering 26-0 record at majors for 2022.

For a moment it seemed Rafael Nadal was in danger of a premature exit from the US Open against Fabio Fognini on Thursday but he steadied to improve his 2022 grand slam record to 21-0.

Nadal won the Australian Open and French Open titles earlier this year, but an abdominal injury forced him to withdraw from Wimbledon at the semi-final stage, handing Nick Kyrgios a passage to the decider won by Novak Djokovic.

The 22-time major champion is on a mission to make it three from four grand slam titles this calendar year in Djokovic's absence in New York.

The 36-year-old Spaniard will take on veteran Richard Gasquet next in the third round, whom Nadal boasts a remarkable 17-0 head-to-head record against.

Nadal's 2-6 6-4 6-2 6-1 win over Fognini also meant he became the first player to qualify for the season-ending ATP Finals in Turin too.

But the current world number three has bigger fish to fry, needing to maintain his perfect 2022 record at majors for a fifth US Open crown.

If he succeeds, Nadal will not quite claim a calendar Grand Slam - achieved only by five players in singles history in Don Budge (1938), Maureen Connolly (1953), Rod Laver (1962, 1969), Margaret Court (1970) and Steffi Graf (1988) - but he would have achieved a staggering 26-0 record at majors for 2022.

Rafael Nadal's quest for a 23rd grand slam title remains alive after overcoming a slow start to defeat Italian veteran Fabio Fognini in four sets on Thursday.

Nadal lost the opening set and trailed 4-2 in the second frame before responding in trademark fashion, winning 16 of the next 19 games, to set up a third-round meeting against Richard Gasquet.

The Spaniard won 2-6 6-4 6-2 6-1 in two hours and 42 minutes, having also lost the opening set in the first-round win over Rinky Hijikata.

This year's Australian Open and French Open champion's surge to victory was momentarily halted in the fourth set 3-0 up in the fourth game when his racquet bounced off the hard court and into his nose when stretching for a shot.

Nadal needed a medical timeout and treatment but would return to play on, appearing relatively untroubled despite wearing a bandage over his nose, to complete the win.

The four-time US Open champion, who amassed 37 unforced errors for the match, found himself in a spot of bother after losing the first frame with Fognini converting both of his two break points, before a wild second set that included seven breaks of serve.

Fognini appeared on course for a two-set lead at 4-2 but 23 unforced errors in the second set let him down with Nadal's pressure rising.

The Spaniard's game went up a level in the third, improving his first serve percentage to 75 per cent and only omitting five unforced errors and he carried that momentum through the fourth where he broke Fognini in the second and sixth games, before serving it out.

Data Slam: Breaks galore as Rafa gets revenge

Way back at the 2015 Open playing in a similarly late evening match past midnight, Fognini came from two sets down to defeat Nadal but the Spaniard reversed that this time around. Back in 2015 there were 17 breaks of serve for the match, while in 2022, with a set less played, there were 15 breaks for the match. Almost half of those were in a crazy second set.

WINNERS/UNFORCED ERRORS

Nadal – 20/37

Fognini – 24/59

ACES/DOUBLE FAULTS

Nadal – 4/2

Fognini – 1/9

BREAK POINTS WON

Nadal – 9/14

Fognini – 6/10

Rafael Nadal's quest for a 23rd grand slam title remains alive after overcoming a slow start to defeat Italian veteran Fabio Fognini in four sets on Thursday.

Nadal lost the opening set and trailed 4-2 in the second frame before responding in trademark fashion, winning 16 of the next 19 games, to set up a third-round meeting against Richard Gasquet.

The Spaniard won 2-6 6-4 6-2 6-1 in two hours and 42 minutes, having also lost the opening set in the first-round win over Rinky Hijikata.

This year's Australian Open and French Open champion's surge to victory was momentarily halted in the fourth set when his racquet bounced off the hard court and into his nose when stretching for a shot.

Nadal needed a medical timeout and treatment but would return to play on, appearing relatively untroubled despite wearing a bandage over his nose, to complete the win.

The four-time US Open champion found himself in a spot of bother after losing the first frame with Fognini converting both of his two break points, before a wild second set that included seven breaks of serve.

Fognini appeared on course for a two-set lead at 4-2 but 23 unforced errors in the second set let him down with Nadal's pressure rising.

The Spaniard's game went up a level in the third, improving his first serve percentage to 75 per cent and only omitting five unforced errors and he carried that momentum through the fourth where he broke Fognini in the second and sixth games, before serving it out.

Data Slam: Breaks galore as Rafa gets revenge

Way back at the 2015 Open playing in a similarly late evening match past midnight, Fognini came from two sets down to defeat Nadal but the Spaniard reversed that this time around. Back in 2015 there were 17 breaks of serve for the match, while in 2022, with a set less played, there were 15 breaks for the match. Almost half of those were in a crazy second set.

WINNERS/UNFORCED ERRORS

Nadal – 20/37

Fognini – 24/59

ACES/DOUBLE FAULTS

Nadal – 4/2

Fognini – 1/9

BREAK POINTS WON

Nadal – 9/14

Fognini – 6/10

US Open reigning champion and top seed Daniil Medvedev has put the pressure on 22-time grand slam winner Rafael Nadal who he believes is the frontrunner for the Flushing Meadows title.

Medvedev endured a 10pm start time playing on Arthur Ashe Stadium after Serena Williams' three-set win over Anett Kontaveit on Wednesday evening to defeat Arthur Rinderknech 6-2 7-5 6-3 in two hours and 11 minutes in the second round.

The Russian was not happy with his level early in Wednesday's match, admitting he did not adjust seamlessly to the late start time, but said he worked into it.

The win books a third-round clash with Chinese qualifier Wu Yibing but Medvedev was pressed on the favourites for the men's singles title in the absence of Novak Djokovic this year.

Medvedev claimed his maiden major at last year's US Open with victory over Djokovic in the final, while he lost to Nadal in a memorable five-set Australian Open decider earlier this year.

"First of all, I don't want to put pressure on anybody, but I think Rafa is a big favourite also," Medvedev told reporters.

"He won the last time he played here against me actually. He won two slams this year. I think Novak is better on grass, but Rafa didn't play.

"He actually didn't lose in a Grand Slam this year. He retired [in the Wimbledon semi-final against Nick Kyrgios], which is not the same.

"In my opinion Rafa is big, let's call it like this, I don't want to say favourite, big favourite, he's definitely big figure in this tournament.

"Then for sure there are many other good guys. I'm happy to see my name sometimes in the odds or something like this because I'm like, that's great. That means that I play some good tennis.

"Being amongst the favorites just brings me more motivation to try to do well."

Medvedev compared his 2022 form in New York (he beat Stefan Kozlov in the first round in straight sets) to last year's when he won the title, admitting he did not feel he was going as well as 12 months ago at this stage.

"These two matches felt a little bit less good comparing to last year, but at the same time I know I already played a lot of Grand Slams," he said.

"That's not the most important. The most important is to win, to stay in the tournament, to try to get as far as possible, for sure try to raise your level when the opponents go stronger and stronger.

"Finally you're going to play somebody who has a Grand Slam or something like this."

Rafael Nadal was "super happy" to be back on the court after injury, coming from a set down to beat Rinky Hijikata in the first round of the US Open.

Hijikata raced out to a one-set lead against the 22-time grand slam champion to give him hopes of a major upset.

But the 36-year-old Nadal romped back to win the next three sets and secure safe passage into the next round 4-6 6-2 6-3 6-3.

Although Nadal has won the Australian Open and French Open titles this season, he has also suffered with injuries, withdrawing from his Wimbledon semi-final against Nick Kyrgios with an abdominal problem.

That issue meant he had played just once – in defeat to Borna Coric at the Cincinnati Masters – between the previous major at the All England Club and Tuesday's match at Flushing Meadows.

The lay-off prompted doubts in Nadal's mind, and he was therefore relieved to be back in action.

"It's been a long wait," said Nadal in his on-court interview after the match.

"For some time, I thought I may not be able to be back, so I am super happy. I just have to be humble and accept the process, day after day in practices and matches, and stay positive.

"I think I started not that bad the first couple of games, but then I had some opportunities that I was not able to make.

"I think I didn't play a good game with my serve. Then he had the break. Then I was a little bit nervous. First match here in New York after three years, a night session, it's always exciting. Yeah, I went through this tough moment.

"It's always the same story: things are not perfect when you are not competing very often, when you come back from injury. I am able to play again in two days, and I hope to play better."

Rafael Nadal believes he is treated the same as any other player in terms of shot-clock violations – even if John McEnroe suggests otherwise.

Nadal became engaged in a slightly awkward exchange with a reporter following his first-round win at the US Open on Tuesday.

After beating Rinky Hijikata 4-6 6-2 6-3 6-3, it was put to the Spaniard that there are "different rules for Rafael Nadal than there are for everybody else".

The reporter referred to comments from McEnroe, who has asked why Nadal was not punished for taking more than 25 seconds to serve.

Nadal was amused by both the question and McEnroe's comments, replying: "Yeah, I think it's a joke.

"I went through a lot of warnings under my tennis career – never for breaking a racquet, never for doing a mess on court, but yes, for the time clock.

"I have a problem that I am sweating a lot. When you are playing during these very humid conditions, we have a biggest problem today, that is we don't have the ballboys bringing the towel to you for the last couple of years. You have to go to the farthest place of the court to take the towel.

"The problem for players like me that are sweating that much, you know when you go to pick up the towel, you're going to be in trouble with the time. So I am not going very often.

"I don't think I have a different treatment from the umpires at all.

"I never said that [there should be different rules for Nadal]. I am following the rules. If I am having more than 25 seconds, I receive a warning every single time.

"If not, check the clock. I don't know if you want to create [something].

"I don't think I'm receiving a different treatment at all. I don't understand why John can say that on the TV. But I'm going to have a chat with him later."

Rafael Nadal survived an early scare against world number 198 Rinky Hijikata, steadying after dropping the first set to run away with a 4-6 6-2 6-3 6-3 victory.

The first set saw the 21-year-old Australian play out of his skin in the biggest match of his life, hitting 11 winners in the frame, before only being able to muster a combined 15 winners in the next three sets.

Nadal also left the door open, with one of his two double faults in the match leading to Hijikata's only break point opportunity from the first three sets, and he took full advantage before serving it out.

From that point on, it would be all Nadal as he found his footing, winning the points from 14 out of his 15 accurate first serves in the second set, before his second serve lifted in the third frame, taking 11 of those 13 opportunities.

A competitive fourth set meant Nadal had to save three break points, but only after he had already secured a break of his own and was cruising towards the finish line. 

He needed five match points to finish off the determined Aussie, but he got the job done after three hours and 12 minutes of action, booking his place against Italy's Fabio Fognini in the second round.

Data Slam: Nadal's uncharacteristic start

The last time Rafael Nadal lost the opening set of a grand slam match against an opponent ranked outside of the top-100, it was five years ago at the 2017 US Open against Taro Daniel. It was a similar story on that day, as the Spaniard then rattled off the next three sets 6-3 6-2 6-2 without issue.

WINNERS/UNFORCED ERRORS

Nadal – 43/22

Hijikata – 27/33

ACES/DOUBLE FAULTS

Nadal – 9/2

Hijikata – 7/4

BREAK POINTS WON

Nadal – 5/10

Hijikata – 1/4

Serena Williams' former coach Rick Macci does not foresee a dream US Open triumph for the retiring legend, but believes the Flushing Meadows crowd could help her enjoy a strong run.

Williams, who announced she was "evolving away" from tennis earlier this month, will begin her final US Open campaign against Danka Kovinic on Monday.

While the 40-year-old's tally of 23 grand slam titles is the most of any player in the Open Era (since 1968), she remains one victory short of Margaret Court's all-time record of 24. 

But Macci, who coached both Williams and older sister Venus at the beginning of their trophy-laden careers, struggles to see her adding one final title before signing off.

"They asked me can Serena Williams win the US Open and I said she already has, six times," Macci told Stats Perform. 

"Can she? It's highly unlikely simply because people aren't afraid of her, the movement and confidence aren't like it was because she hasn't played, she hasn't played that much in the last year and you need to play to get your footwork and stamina. 

"The fighting spirit, the Compton street fight and the heart is there. If she gets a good draw, she could beat some people. I like how she played against [Emma] Raducanu [a 6-4 6-0 loss in Cincinnati earlier in August], I like that she's more aggressive, but this takes time. 

"If she can win a few matches who knows what could happen? That crowd in New York is going to take her down memory lane and make her even more competitive, who knows what's going to happen to the person on the other side of the net?

"That's why I was so impressed with Raducanu, the way she handled that moment, she played the best match she had in a year. 

"It cuts both ways but it's highly unlikely she can win the Open. 

"She's not even looking at it like that, she's letting everyone savour the moment and going out on her terms and it's going to be must-see tv."

Asked who he thought would emerge victorious at Flushing Meadows, Macci tipped another American to win on home soil, adding: "I'd love to see Coco Gauff because I know the family and I think she has wonderful potential.

"Iga [Swiatek] is vulnerable now because when you win 35 in a row, you feel like you just show up you're going to win. 

"Now that she's lost a few there's a little doubt there. It's wide open, I'm going to go out on a limb and I'm taking Coco Gauff."

As for the men's draw, which appears balanced after Novak Djokovic's non-vaccinated status prevented him from travelling to New York, Macci thinks third seed Carlos Alcaraz could be set for a maiden grand slam win.

"I've already gone out there and talked about this, Carlos Alcaraz is a generational player, he's going to transcend the game," Macci added.

"I've already had people blow back on me like, 'why isn't he winning?' Trust me, he just turned 19 and is [number] four or five in the world, I think he'll win multiple grand slams and he's the next real deal and he's my favourite to win the US Open on the men's side."

Djokovic is not alone in missing the US Open, with Roger Federer also absent as he continues his recovery from knee surgery, while Rafael Nadal is making his first appearance at the slam since triumphing in 2019.

Four different men have tasted success at Flushing Meadows in the last four years, while each of the last three editions have featured different women's singles champions, and Macci believes the issues endured by several ageing greats have made tennis more competitive.

"I think a lot of people are heading toward exit stage left and they're not quite at the top, [such as] Federer, or maybe there's the vaccination and maybe Nadal you're not quite where you were and [Andy] Murray," he added.

"Then you've got Serena, you've got these people who are household names that are out of the equation, more people are coming in and it changes everything when you don't have those roadblocks at the round of 16. 

"You're looking at the semis when before, Federer, Nadal, Djokovic and Murray just dominated. There was a time when those four were always in the semis. The women's you could almost predict, now you can't.

"It has nothing to do with the US Open because the young lady that won Wimbledon [Elena Rybakina], you never heard of her. It's just wide open and it's going to take a while to stabilise everything." 

There seems to be no escaping the number 23 for Serena Williams as she prepares for an emotional final grand slam at the US Open.

It is 23 years since the legendary American won her first major singles title at Flushing Meadows, where she was also crowned doubles champion back in 1999.

Williams has gone on to win an astonishing 23 grand slam singles titles and 14 major doubles titles in an incredible career that is about to come to an end in New York.

One of the all-time greats turns 42 next month and although she is unlikely to bow out by claiming an elusive 24th major singles title in her home major, she is sure to be given a spine-tingling farewell.

Novak Djokovic's absence due to not being vaccinated against COVID-19 has been the big talking point in the men's singles, with Rafael Nadal getting an opportunity to extend his record tally of major successes.

Stats Perform picks out the standout numbers to preview the final major of the year as Emma Raducanu and Daniil Medvedev prepare to defend their titles.

Serena's incredible longevity

Such is the remarkable longevity of Williams' career, defending champion Raducanu and world number one Iga Swiatek were not even born when she won her first major.

Wimbledon champion Elena Rybakina was only a few months old when the iconic Saginaw native beat Martina Hingis in the 1999 US Open final for the first of so many major titles.

Only Chris Evert can boast as many US Open titles as Williams' tally of six in the Open Era, while she has played in a record 10 finals at Flushing Meadows.

The retiring veteran has 106 victories in her home major, a record in the Open Era, and only Martina Navratilova has recorded more wins in a single major - with 120 at Wimbledon.

Williams will be making her 21st main-draw appearance at the US Open, with only her older sister, Venus, bettering that figure in the Open Era as she prepares for her 23rd.

Long-awaited New York return for Nadal 

Nadal has not played at Flushing Meadows since he was crowned champion for a fourth time three years ago, having missed the 2020 tournament amid the coronavirus pandemic and not played last year due to a foot injury.

The Spanish great's hopes of completing a first calendar Grand Slam were ended by an abdominal injury that resulted in his withdrawal from Wimbledon ahead of a scheduled semi-final against Nick Kyrgios.

He could make it three major titles out of four this year in New York, though, where he will be bidding to take his haul of grand slam titles to 23 and move two clear of the absent Djokovic once again.

If Nadal lifts the trophy on Arthur Ashe Stadium, it would give him a record-equalling fifth US Open men's singles title - matching the haul of Jimmy Connors, Pete Sampras and Roger Federer.

Only Bjorn Borg (89.2 per cent) has a higher winning ratio in grand slam tournaments during the Open Era than Nadal's 88.3 per cent among players with at least 100 victories to their name, 

Another record in women's singles?

Teenage Brit Raducanu made history when she became the first qualifier to win a major title last year, beating Leylah Fernandez in the final.

Swiatek has dominated the women's game for much of this year, the highlight being her second French Open triumph.

With the retired Ash Barty, Swiatek and Rybakina taking the singles titles in 2022, there could be four different gram slam champions for a fifth consecutive season - excluding 2020 - and that would be the longest such streak in the Open Era.

Alcaraz to make major breakthrough?

While Nadal will be the Spaniard with the largest burden of expectation on his shoulders, Carlos Alcaraz should be a big threat in New York.

The 19-year-old could become the fifth player in the Open Era to reach at least the quarter-finals in his first two appearances at Flushing Meadows after Ken Rosewall, Arthur Ashe, John Newcombe and Johan Kriek.

Alcaraz has the joint-most ATP Tour titles this year with four, matching Nadal's tally.

Rafael Nadal described Novak Djokovic's absence from the US Open as "very sad" after the Serbian revealed he would not compete at Flushing Meadows.

Djokovic announced he would not be making the trip to New York on Thursday, due to visitors to the United States being required to display proof of vaccination against COVID-19.

The US Open will represent the second grand slam Djokovic has missed this year, after his unvaccinated status saw him deported from Melbourne ahead of the Australian Open in January.

Nadal is one of the most likely players to benefit from Djokovic's absence as he bids to win a 23rd grand slam title, but the Spaniard expressed sympathy for his rival as he prepared to begin his US Open campaign against Rinky Hijikata next week.

"From my personal perspective, it's very sad news," Nadal said. "It's always a shame when the best players in the world are not able to play a tournament because of injuries or because of different reasons.

"It's tough for the fans, tough for the tournament. In my opinion, tough for the players, too, because we want to have the best field possible."

Nadal's clash with Hijikata will represent his first outing at Flushing Meadows since he beat Daniil Medvedev to win the 2019 title, and injuries have caused him to miss four of the last 10 editions of the tournament.

Roger Federer, another of Nadal's great rivals, will also miss the competition after undergoing three knee operations in two years, but the Spaniard believes the major championships can cope with the absences of tennis' aging stars.

"The world of tennis [will] keep going, even if it is not good news for everyone," he added. "The world continues and the tennis will continue after me, after Novak, after Roger.

"Without a doubt, Novak is one of the most important players of the last 20 years, [in] the history of our sport. In a personal way, I feel sorry for him that he's not able to travel here."

Meanwhile, Federer is hoping to return to the court for September's Laver Cup, where he will join Nadal and Djokovic in a star-studded Team Europe line-up, and the Swiss maestro's old foe is desperate to see him make his long-awaited comeback.

"I'm super excited to see Roger again on court, of course," Nadal said. "I hope he's healthy enough to make that happen.

"It has been a long period of time without Roger on court so I really hope that he can manage to be back.

"The most important thing at this stage of his career is the health and the happiness, no? If he's healthy enough and happy enough to be back on the tennis tour, it will be amazing. 

"If not, we can say thanks to him for everything that he achieved. I am confident that we will keep having Roger for a while."

Serena Williams will face Danka Kovinic in the first round as the American great begins her final US Open campaign.

It will be a final grand slam for 40-year-old Williams, who has won six singles titles in New York and been a runner-up on four occasions.

Her first singles crown in a major came as a 17-year-old at Flushing Meadows, when she beat Martina Hingis in the 1999 final.

Now the end of a glorious career is beckoning for the 23-time singles major winner, who has also landed 16 doubles grand slam titles.

Kovinic is the world number 80 from Montenegro, with the 27-year-old having only won two matches at the US Open in four previous main-draw appearances.

The winner of that match will likely face Estonian second seed Anett Kontaveit in round two. Kontaveit's first-round opponent will be Romanian Jaqueline Adina Cristian.

Defending champion Emma Raducanu, who was a shock winner last year, faces a tricky first-round assignment against France's Alize Cornet.

Cornet is the tour veteran who beat Iga Swiatek at Wimbledon, ending the Pole's 37-match winning streak, and this will be her 64th consecutive grand slam appearance, a record for WTA Tour players.

World number one Swiatek starts against Italian Jasmine Paolini and could face 2017 US Open champion Sloane Stephens in round two.

Former champion Naomi Osaka, unseeded this year, was paired with Danielle Collins, the 19th seed who was an Australian Open runner-up at the start of the year.

The tournament gets under way on Monday.

Men's defending champion Daniil Medvedev faces American Stefan Kozlov in his opener, while Rafael Nadal, who has not lost a grand slam match all year, faces Australian wild card Rinky Hijikata.

Nadal won the Australian Open and French Open titles before pulling out of Wimbledon ahead of his semi-final against Australian Nick Kyrgios due to an abdominal tear.

That handed Kyrgios a bye through to face Novak Djokovic, who got the better of the Australian, but the Serbian must miss the US Open because his refusal to be vaccinated against the COVID-19 virus meant he would not be allowed to enter the United States.

Djokovic's absence was confirmed shortly before the draw was revealed.

Fast-rising Spanish teenager Carlos Alcaraz begins against Argentina's Sebastian Baez, while fourth seed Stefanos Tsitsipas will face a yet-to-be-determined qualifier.

Victoria Azarenka will not play in the Tennis Plays for Peace Exhibition at Flushing Meadows on Wednesday, the United States Tennis Association (USTA) has announced.

The former world number one was due to participate in the charity event set up in support of Ukraine ahead of next week's US Open.

The Belarusian's involvement in the exhibition came under scrutiny from Ukrainian player Marta Kostyuk, who subsequently declined the opportunity to compete alongside the likes of Rafael Nadal, Iga Swiatek and John McEnroe.

Azarenka had called for player unity following Russia's Belarus-assisted invasion of Ukraine earlier this year, with the two-time Australian Open winner saying Wimbledon's ban on Russian and Belarusian players made no sense.

Following the recent criticism led by Kostyuk, who was bemused by the presence of Azarenka, the USTA decided it would be in the best interest of the event if she was not involved.

In a statement, the governing body said: "In the last 24 hours, after careful consideration and dialogue with all parties involved, Victoria Azarenka will not be participating in our 'Tennis Plays for Peace Exhibition' this evening [Wednesday].

"Vika is a strong player leader and we appreciate her willingness to participate. Given the sensitivities to Ukrainian players, and the ongoing conflict, we believe this is the right course of action for us."

John McEnroe has called Novak Djokovic's potential absence from the US Open over his vaccination status a "joke".

The United States does not currently allow those who have not received the COVID-19 jab into the country, putting the unvaccinated Djokovic in real danger of missing this year's edition of the tournament he has won three times.

The Serb has already missed the Australian Open this year because of his lack of vaccination, while also missing tournaments at Indian Wells in California, as well as the Rogers Cup in Canada.

He did however win his 21st Grand Slam at Wimbledon earlier this year, and McEnroe believes Djokovic should be allowed to play at Flushing Meadows as he chases down Rafael Nadal for the most Grand Slam titles in history.

Ahead of the tournament in New York, McEnroe told reporters: "No, I don't think it's fair. I think it's a joke.

"I would have had the vaccine and gone and played but he's got very strong beliefs and you have to respect that. 

"At this point, in the pandemic, we're two and a half years in, I think people in all parts of the world know more about it, and the idea that he can’t travel here to play, to me is a joke."

On whether Djokovic's decision not to get the vaccine could affect his competition with Nadal and Roger Federer to become the most decorated male player ever, McEnroe replied: "That's the question that we all want to know the answer to.

"Obviously, Rafa Nadal has benefited from that. These three guys are already above everyone else. So, it makes it extremely interesting to see these two go at it and then you think of Roger Federer but he's been hurt for a while."

However, McEnroe believes Djokovic can overcome his vaccination status to win more titles, adding: "Who's to say [Djokovic] can't do it for another couple of years?

"Let's say that he wins three or four more. That's not impossible, by any means. Despite this, he can still get to 25. I think it's made it more complicated to do it because that has to wear on you mentally.

"Training this past month or six weeks not knowing whether he's going to play, that's going to put a strain on you mentally just as it was when he got thrown out of Australia. I think it took him three, four months to get his head right."