Rafael Nadal declared it was imperative to "follow the rules" on COVID-19 vaccinations after rival Novak Djokovic was told he faces being deported from Australia.

World number one Djokovic was left fighting for the right to compete at the Australian Open, a tournament he has won nine times, after authorities cancelled his visa.

A medical exemption was expected to allow Djokovic to enter the country, regardless of his vaccination status, which he has yet to formally disclose.

However, the Australian Border Force declared the Serbian had been ordered to fly out of the country on Thursday, sparking a challenge to that decision by Djokovic's legal team.

Reports in Australia said an interim injunction had been granted, meaning Djokovic will remain in immigration detention until a court hearing on Monday.

According to Nadal, who had COVID-19 recently but has been cleared to compete at Melbourne Park, Djokovic would have made his life a lot easier by going down the vaccination route.

"It's normal that the people here in Australia get very frustrated with the case because they have been going through a lot of very hard lockdowns, and a lot of people were not able to come back home," Nadal said.

"The only thing that I can say is I believe in what the people who know about medicine says, and if the people say that we need to get vaccinated, we need to get the vaccine.

"I went through COVID. I have been vaccinated twice. If you do this, you don't have any problem to play here. The world in my opinion has been suffering enough to not follow the rules.

"I think if he wanted, he would be playing here in Australia without a problem. He made his own decisions, and everybody is free to take their own decisions, but then there are some consequences."

Djokovic was initially detained at an airport after arriving in Australia, while his status remained in limbo. His coach, Goran Ivanisevic, said it had been "not the most usual trip Down Under".

Spanish superstar Nadal has 20 grand slam titles, the same number that Djokovic and Roger Federer have brought up across their careers. They are locked in a race to finish with the most majors, and Federer, at 40, is battling back from injury and unlikely to compete at a slam before the US Open.

Australia's Prime Minister Scott Morrison tweeted on Thursday: "Mr Djokovic's visa has been cancelled. Rules are rules, especially when it comes to our borders.

"No one is above these rules. Our strong border policies have been critical to Australia having one of the lowest death rates in the world from COVID, we are continuing to be vigilant."

Nadal has some sympathy for Djokovic, but it appears to be limited.

"Of course, I don't like the situation that is happening," Nadal said. "In some way I feel sorry for him. But at the same time, he knew the conditions since a lot of months ago, so he makes his own decision."

Novak Djokovic was left fighting for the right to compete at the Australian Open on Wednesday after authorities cancelled his visa.

The world number one announced on Tuesday that he had received a medical exemption to play in the tournament he has won a record nine times. 

That medical exemption was expected to allow Djokovic to enter the country, regardless of his vaccination status, which he has yet to formally disclose.

However, the Victorian government reportedly rejected an application as a member of Djokovic's support team made an error in requesting a sub-class of visa.

Further doubt was cast over Djokovic's chances of being allowed to contest the first grand slam of the year when Jaala Pulford, the acting sports minister of the state of Victoria, later declared on social media that the Serbian's application will not be supported.

It was later announced by the Australian Border Force (ABF) he had been ordered to fly out of the country on Thursday, although his legal team was said to be challenging the decision.

"The ABF can confirm that Mr Djokovic failed to provide appropriate evidence to meet the entry requirements to Australia, and his visa has been subsequently cancelled," the force said.

"Non-citizens who do not hold a valid visa on entry or who have had their visa cancelled will be detained and removed from Australia.

"The ABF can confirm Mr Djokovic had access to his phone.​"

Djokovic's father had earlier accused authorities of holding the 20-time major winner "captive for five hours".

He told Russian news agency Sputnik: "This is a fight for the libertarian world, not just a fight for Novak, but a fight for the whole world.

"If they don't let him go in half an hour, we will gather on the street. This is a fight for everyone."

Novak Djokovic is "being held captive" in a room guarded by police after arriving in Melbourne for the upcoming Australian Open, the tennis star's father has alleged.

World number one Djokovic announced on Tuesday that he had received a medical exemption to play in the tournament he has won a record nine times. 

That medical exemption was expected to allow Djokovic to enter the country, regardless of his vaccination status, which he has yet to formally disclose.

However, the Victorian government reportedly rejected an application from Border Force as a member of Djokovic's support team made an error in requesting a sub-class of visa.

Further doubt was cast over Djokovic's chances of being allowed to contest the first grand slam of the year when Jaala Pulford, the acting sports minister of the state of Victoria, later declared on social media that the Serbian's application will not be supported.

And amid later reports that the 20-time major winner could be forced to fly back home, Djokovic's father Srdjan hit out at authorities for their treatment of his son. 

"Novak is currently in a room which no one can enter," he told the B92 internet portal. "In front of the room are two policemen."

Srdjan added to Russian news agency Sputnik: "I have no idea what's going on. My son has been held captive for five hours.

"This is a fight for the libertarian world, not just a fight for Novak, but a fight for the whole world.

"If they don't let him go in half an hour, we will gather on the street, this is a fight for everyone."

The latest twist in the Djokovic saga comes after Australian prime minister Scott Morrison stated that Djokovic "will be on the next plane home" if he fails to prove he merits medical exemption to play in the tournament.

Australian Open director Craig Tiley insisted on Tuesday that Djokovic had not been given a "special favour" to play in the tournament, which is scheduled to run from January 17 until January 30.

Novak Djokovic's participation at the Australian Open is reportedly back in doubt due to an issue with his visa.

World number one Djokovic flew into Melbourne on Wednesday, a day after revealing he had been cleared to take part in the tournament after receiving a medical exemption.

The Serbian has not directly addressed whether he has been vaccinated against COVID-19, but players who compete at Melbourne Park either require proof they have been jabbed or an exemption.

He has spoken openly and critically about vaccine mandates, insisting there should be freedom of choice in all walks of life.

Many Australians criticised the decision to welcome Djokovic into the country, but the 34-year-old appears to have hit another stumbling block in his battle to defend the title he has won a record nine times.

Reports from Australia suggested that the Victorian government had rejected an application from Border Force regarding Djokovic's visa as a member of his support team made an error in requesting a sub-class of visa.

And Jaala Pulford, the acting sports minister of the state of Victoria, later declared on social media that Djokovic's application will not be supported.

"The Federal Government has asked if we will support Novak Djokovic's visa application to enter Australia," she posted on Twitter.

"We will not be providing Novak Djokovic with individual visa application support to participate in the 2022 Australian Open Grand Slam.

"We've always been clear on two points: visa approvals are a matter for the Federal Government, and medical exemptions are a matter for doctors."

The latest twist in the Djokovic saga comes after Australian prime minister Scott Morrison stated that Djokovic "will be on the next plane home" if he fails to prove he merits medical exemption to play in the tournament.

Australian Open director Craig Tiley insisted on Tuesday that the 20-time major champion had not been given a "special favour" to play in the tournament, which is scheduled to run from January 17 until January 30.

Novak Djokovic should clear up any doubts over the reasons for his medical exemption to play at the Australian Open, says Toni Nadal.

Tournament organisers have faced a backlash after it was announced this week that men's world number one Djokovic has been granted a medical exemption to play in the first grand slam of the year.

Protocols in Australia require proof that competitors and staff have been jabbed or have a medical exemption to compete at Melbourne Park. Djokovic has thus far refused to state whether he has been vaccinated.

Australian prime minister Scott Morrison said on Wednesday that Djokovic would be on the "next plane home" if he fails to prove he is medically exempt, though tournament organiser Craig Tiley insisted the 20-time major champion had not been given a "special favour" to play.

Nadal, the uncle of Djokovic's long-term rival and also 20-time major victor Rafael Nadal, has now weighed in, expressing surprise the Serbian did not pull out of the tournament and urging him to clarify his situation.

In his column for El Pais, Nadal wrote: "I must admit that, until Tuesday's announcement, I thought that the Serbian player would give up participating in the tournament or that he would get the vaccine.

"The way I understand it, if you have requested and received an exemption then it's because you must not have been administered any of the authorised [vaccines].

"There are almost six million people who have lost their lives due to this damn virus and many other millions who have received the vaccine.

"I want to think that Novak is no stranger to all this and that he will clear up the doubts as a sign of human sensitivity and understanding."

The Australian Open begins on January 17.

Novak Djokovic will be on the "next plane home" if he fails to prove he merits a medical exemption to play in the Australian Open.

Tournament organisers have faced a backlash after it was announced this week that Djokovic has been granted a medical exemption to play in the first grand slam of the year.

The Serbian has refused to state whether he has been vaccinated, but protocols in Australia require proof that competitors and staff have been jabbed or have a medical exemption to compete at Melbourne Park.

Tournament director Craig Tiley insisted that the 20-time major champion had not been given a "special favour" to play in the tournament.

Australian Prime Minister Scott Morrison on Wednesday stated that Djokovic will not defend his title if he fails to show that he is exempt.

He told reporters: "We await his presentation and what evidence he provides us to support that.

"If that evidence is insufficient, then he won't be treated any different to anyone else and he'll be on the next plane home. There should be no special rules for Novak Djokovic at all. None whatsoever."

Tiley told The Today Show on Tuesday: "There's been no special favour. There's been no special opportunity granted to Novak.

"As an organisation and as a sport, we've done what everyone else does and would do if they wanted to come to Australia and under certain conditions.

"And we have abided by those conditions and I know Australia's had the most comprehensive response to COVID of any nation in the world. And our governments have done everything they humanly possibly can to keep us safe.

"It's ultimately the decision of the medical experts and we follow that accordingly. In this case, Novak made that application.

"And like others, there's been 26 athletes and their primary support staff that have made applications and a handful of those have been granted by the panel.

"The conditions in which any tennis player comes in, no matter who they are, are conditions that have been put on tennis and put on anyone coming into Australia by the Australian government."

The Australian Open begins on January 17.

Novak Djokovic has not been granted any "special favour" for a medical exemption to play in the Australian Open, tournament director Craig Tiley insisted.

Djokovic announced on Tuesday that he was on his way to Melbourne for the first grand slam of 2022, a revelation that was met with a host of criticism.

The world number one has not openly addressed whether he has been vaccinated for COVID-19, but protocols in Australia require proof that competitors have been jabbed or have a medical exemption to feature at Melbourne Park.

The Serbian has been vocal in his opposition for vaccine mandates, calling for freedom across the world, and is now expected to be welcomed with a frosty reception by those in the country battling a surge in cases of the Omicron variant.

Tiley spoke on the matter, coinciding with confirmation from the Australian Open that the 34-year-old was set to compete, as he referenced the "fair and independent protocols" in granting exemptions.

The tournament director has since reiterated his defence over the decision to allow Djokovic to defend his title, and search for a record 21st singles grand slam triumph, as he insisted there had been no preferential treatment.

Tiley said on Australia's The Today Show: "There's been no special favour. There's been no special opportunity granted to Novak.

"As an organisation and as a sport, we've done what everyone else does and would do if they wanted to come to Australia and under certain conditions.

"And we have abided by those conditions and I know Australia's had the most comprehensive response to COVID of any nation in the world. And our governments have done everything they humanly possibly can to keep us safe.

"It's ultimately the decision of the medical experts and we follow that accordingly. In this case, Novak made that application.

"And like others, there's been 26 athletes and their primary support staff that have made applications and a handful of those have been granted by the panel.

"The conditions in which any tennis player comes in, no matter who they are, are conditions that have been put on tennis and put on anyone coming into Australia by the Australian government."

Roger Federer and Rafael Nadal also sit with Djokovic on 20 major crowns, but the Swiss star is already ruled out of the tournament, which starts on January 17, through injury.

Nadal could yet compete after posting pictures showing he was in Melbourne as he continues to recover from a positive COVID-19 test in recent weeks.

Jamie Murray has questioned why Novak Djokovic was granted special dispensation to compete at the Australian Open.

Seven-times grand slam doubles champion Murray was asked about the decision to grant Djokovic a medical exemption for the year's first grand slam tournament at Melbourne Park.

Players have been obliged to either prove they are vaccinated against COVID-19 or apply for an exemption, which tournament organisers said involved a "rigorous" process to prove eligibility.

World number one Djokovic is a nine-time Australian Open men's singles champion, yet it was unclear until Tuesday whether he would be allowed to play the event this year.

There has been early backlash to the decision to clear him, with Melbourne having been hit by multiple lockdowns during the pandemic and many believing only vaccinated players should be playing.

Murray, brother of Djokovic's long-time friend and rival Andy Murray, spoke after the Serbian was permitted to travel into Australia and said he doubted he would get the same treatment.

Asked about the situation in an ATP Cup news conference, Jamie Murray said: "I don't know what to say about that really. I think if it was me that wasn't vaccinated, I wouldn't be getting an exemption.

"But well done to him for getting cleared to come to Australia and compete."

Djokovic may wish to elaborate further on the factors behind him being given the green light to travel into the state of Victoria, and will doubtless face media questions about the situation once he arrives.

However, the 20-time grand slam winner has been unwilling to disclose his vaccination status until now, which suggests there is little prospect of him offering further medical insight at this stage.

Asked if he felt it was not a fair decision to exempt Djokovic, Jamie Murray added: "Whatever you want to say, that's the situation."

Murray, 35, was interrupted at that point by Great Britain captain Liam Broady, who said: "At the end of the day, you have to trust he has a valid reason for the medical exemption, that's all you can say about it really, isn't it."

However, Broady had no doubt Djokovic would play the Australian Open, which begins on January 17, and claimed it was a foregone conclusion.

In an Instagram story, Broady posted a screenshot of Djokovic's announcement, adding the remark: "The second AO announced there would be exemptions 8 weeks ago we all knew."

Novak Djokovic went through "rigorous" checks before being handed a medical exemption to compete at the Australian Open, tournament chiefs insisted.

A wave of criticism followed Djokovic's announcement that he was on his way to Melbourne for the season's first grand slam tournament.

The Serbian has not directly addressed whether he has been vaccinated against COVID-19, but players who compete at Melbourne Park either require proof they have been jabbed or an exemption.

He has spoken openly and critically about vaccine mandates, insisting there should be freedom of choice in all walks of life.

Many Australians on social media spoke out against the decision to welcome Djokovic into the country, predicting he could face a frosty reception while the country battles surging cases of the Omicron variant.

Djokovic will be bidding to win a 10th Australian Open title and a record 21st singles grand slam, more than any man in history.

The 34-year-old had his bags packed and was awaiting a flight at an airport when he broke the news of his trip to Australia on Tuesday.

Australian Open chiefs confirmed he had been granted permission to play, saying in a statement: "Novak Djokovic will compete at the Australian Open and is on his way to Australia.

"Djokovic applied for a medical exemption which was granted followting a rigorous review process involving two separate independent panels of medical experts. One of those was the independent medical exemption review panel appointed by the Victorian Department of Health."

There has been no detail given of why Djokovic qualified for an exemption, and unless he is willing to disclose personal medical information it is set to remain that way.

Australian Open tournament director Craig Tiley said it remained the case that all involved with the tournament, from fans through to players, must be fully vaccinated or have an exemption permission allowing them to attend.

Tiley said: "Fair and independent protocols were established for assessing medical exemption applications that will enable us to ensure Australian Open 2022 is safe and enjoyable for everyone.

"Central to this process was that the decisions were made by independent medical experts and that every applicant was given due consideration."

Explaining the process of securing exemptions, the Australian Open indicated in its statement that Djokovic would not have been treated as a special case.

It pointed out that a government-appointed panel assessed all cases that got past the first stage of checks, and that "the process included the redaction of personal information to ensure privacy for all applicants".

This should mean Djokovic was not identifiable to those making the crucial decisions about whether he should be allowed to take part.

"The multi-step independent review process was designed to ensure the safety of everyone at the Australian Open," the tournament statement added.

Novak Djokovic has announced he will play at the Australian Open, revealing he has been given "exemption permission" to compete.

The world number one and nine-time champion in Melbourne has not declared whether he has been vaccinated against the COVID-19 virus.

Australia has stringent rules about who should be allowed to enter the country, with tennis players needing to be either vaccinated or hold a medical exemption in order to play the grand slam tournament.

Serbian superstar Djokovic wrote on Instagram on Tuesday: "I’ve spent fantastic quality time with my loved ones over the break and today I'm heading Down Under with an exemption permission. Let's go 2022!!"

Djokovic's message was accompanied by a picture of him at an airport, with a tennis racquet bag atop his luggage on a trolley, indicating he was ready to board his flight to Australia.

He told his followers: "Happy New Year, everybody! Wishing you all health, love, and happiness in every present moment and may you feel love and respect towards all beings on this wonderful planet."

Australian Open tournament director Craig Tiley said on Sunday he expected defending champion Djokovic's status for the event to become clear within days. The grounds for Djokovic receiving an exemption have yet to be disclosed, and it is unclear whether they will ever be made public.

The 20-time grand slam winner withdrew from the ATP Cup in Sydney last week, begging questions of whether he would head to Australia at all, but now that appears to have been cleared up.

Djokovic has steadfastly refused to disclose whether he has been jabbed. His declaration that he has been given an exemption points to him not having been vaccinated.

The 34-year-old won in Melbourne last February and followed up by triumphing at the French Open and Wimbledon to join Rafael Nadal and Roger Federer on 20 major titles.

Djokovic will be attempting to seize the outright lead by capturing a 21st slam, with the Australian Open running from January 17-30 at Melbourne Park.

He was on the same mission at the US Open but lost out to Daniil Medvedev in the New York final in September, as the Russian landed his first grand slam title at Flushing Meadows.

Medvedev was the man Djokovic beat in last year's Australian Open final, and is again expected to be a major challenger this time around.

Novak Djokovic has announced he will play at the Australian Open, revealing he has been given "exemption permission" to compete.

The world number one and nine-time champion in Melbourne has not declared whether he has been vaccinated against the COVID-19 virus.

Australia has stringent rules about who should be allowed to enter the country, with tennis players needing to be either vaccinated or hold a medical exemption in order to play the grand slam tournament.

Serbian superstar Djokovic wrote on Instagram: "I’ve spent fantastic quality time with my loved ones over the break and today I'm heading Down Under with an exemption permission. Let's go 2022!!"

World number four Stefanos Tsitsipas is optimistic he will be fit for this month's Australian Open after coming through his first complete singles match since undergoing surgery on his right elbow last November.

Following a gruelling three-set defeat to Diego Schwartzman at the ATP Cup in Sydney on Monday, Tsitsipas was upbeat about his prospects of performing in Melbourne.

"It gets better and better every single day", Tsitsipas said of his injury. "We have plenty of time before the Australian Open begins, and I think if I take the right precautions and follow what my doctor says, then I can see myself performing at 100 per cent.

The Greek went on to reveal that medics had harboured serious doubts over his participation at the first Grand Slam of 2022, after he had been forced to withdraw from November's ATP Finals in Turin.

"Going into that surgery, even the doctor was unsure if it was a good idea to perform and play at the Australian Open.

"My recovery was much better than he expected, in comparison with other players that he has treated in the past, so he was surprised. He came to Dubai, and he was surprised to see me hitting close to 100 per cent.

The 2021 French Open finalist also claimed to have enjoyed his contest with Schwartzman, despite the defeat.

"It was good to see myself perform at such a level. I didn't expect it," he said. "It worked out better than I thought. I was able to hit balls that I was scared to hit two weeks ago, so I’m heading towards the right direction."

Tsitsipas, who has won seven ATP Tour events to date, is due to be in action once more in Sydney this week against Georgian, Nikoloz Basilashvili.

Australian Open tournament director Craig Tiley says it should become clear in "the coming days" if Novak Djokovic will defend his title at Melbourne Park this month.

Djokovic withdrew from the ATP Cup in Sydney last week and has not yet arrived in Melbourne for the first grand slam of the year.

Players must be vaccinated or have a medical exemption in order to play in the opening major of 2022 and Djokovic has refused to disclose whether he has been jabbed.

Tiley is unsure whether the world number one will go in search of a record 21st grand slam title at the Australian Open, which starts on January 17.

"We've still got a few charter flights coming in until the end of this week and then all the players will be here," he told the Nine Network.

"As far as the status relates to Novak, I think we'll have a much clearer picture in the coming days otherwise it's getting pretty late to show up and play the Australian Open."

He added: "There's quite a bit to play out and I think it will play out in the coming days."

Djokovic has won the Australian Open men's singles title a record nine times and beat Daniil Medvedev in the 2021 final. 

World number one Novak Djokovic has withdrawn from the ATP Cup in Sydney amid ongoing uncertainty over his title defence at next month's Australian Open.

Djokovic has not yet confirmed his place at January's Grand Slam due to the COVID-19 mandate in Victoria.

The 34-year-old's father, Srdjan, has previously said that the nine-time Australian Open champion is unlikely to feature in Melbourne unless vaccination rules are relaxed.

World number 33 Dusan Lajovic will now lead the Serbia team at the ATP Cup.

Meanwhile, Austria have been replaced by France at the event following the withdrawals of Dominic Thiem and Dennis Novak. The French will be led by world number 35 Ugo Humbert, alongside Arthur Rinderknech, Edouard Roger-Vasselin and Fabrice Martin.

Russia's Andrey Rublev, Aslan Karatsev and Evgeny Donskoy have withdrawn, with Evgeny Karlovskiy joining the team, while Team USA's Austin Krajicek has also pulled out.

The ATP Cup will begin on New Year's Day at both Ken Rosewall Arena and Qudos Bank Arena, Sydney Olympic Park.

Dominic Thiem has withdrawn from next month's Australian Open.

Thiem has not played on the ATP Tour since suffering a wrist injury at the Mallorca Championships in June.

The 2020 US Open champion was due to feature in the Mubadala World Tennis Championship in Abu Dhabi this month, but withdrew after suffering a setback.

Thiem on Tuesday revealed his wrist is in "optimal condition", but the Austrian will miss the first grand slam of the year at Melbourne Park and will instead make his comeback at the Cordoba Open next month.

The Austrian tweeted: "As you all know, I came back home to Austria to recover after hard practice sessions I had in Dubai and the slight setback in my preparation. I am now feeling well again, my wrist is in optimal condition and I am practicing normally with a very good intensity.

"After my short holidays, my team and I have assessed all matters and we have decided to make some changes to my initial tournament schedule.

"I will start the season in South America at the Cordoba Open in Argentina, end of January, and therefore I will not play this year at the Australian Open in Melbourne, a city that I love and where I have great memories of unforgettable matches in front of amazing crowds. I will miss the Australian fans but I will be back in 2023.

"We believe this is the right decision in order to have a good return to competition. For the moment I will remain in Austria for a few more days and then head to practice outdoors and get ready for my first event of the season."

The 28-year-old was a runner-up in the 2020 Australian Open before going on to claim his first major title at Flushing Meadows.