Nick Kyrgios threw in an underarm serve in the second game of his Australian Open campaign, before tossing in a curveball in the post-match news conference.

Speaking after his 6-4 6-4 6-3 win over an outmatched Liam Broady on John Cain Arena, Kyrgios proposed he might play doubles with Novak Djokovic in the future.

Australian Kyrgios has dramatically changed his tune on the Serbian, but not in the way many have altered their perspective following recent events.

Djokovic was deported from Australia in the hours before the Australian Open got under way, a consequence of his own failure to get a COVID-19 vaccine and seemingly mixed messages from authorities before a court settled the kerfuffle.

His behaviour in December after a positive COVID-19 test has been widely criticised, and the reputation of arguably the greatest tennis player of all time has taken a battering in the past fortnight.

Kyrgios recently observed the treatment of Djokovic, a nine-time champion of the Melbourne Park grand slam, had been "really bad" and said it was important to "do better" by the 20-time slam winner.

The 26-year-old from Canberra has emerged as an unlikely cheerleader for the player he described as "a tool" and "a very strange cat" last February, after Djokovic was reported to have requested improved quarantine accommodation on arriving in Australia.

Now Kyrgios is revelling in his apparent sudden popularity in Serbia, where Djokovic's banishment from Australia was greeted with anger and dismay.

"I mean, it's great," Kyrgios said of his new standing. He then turned his focus to why he has stood up for his new friend.

"Obviously me and Novak have had some, I guess, differences in the past. But whether it was Novak or someone else, I would have done the same thing," he said.

"I didn't do it because he was Serbian. If it was another player in that scenario, I would have stood up for what I think was right.

"I think it was just coincidentally it was Novak, and, you know, it was quite a story. But we've got a bit of a bromance going on now, so I'm not going to complain.

"I think I'm going to ask him to play doubles somewhere."

It remains to be seen where this might next prove possible. Djokovic might find he needs a vaccination to play the French Open and US Open this year, amid reports an increasing number of tournaments will insist on players being immunised as a condition of entry.

Kyrgios, meanwhile, faced a daunting second-round match in Melbourne, with title favourite and de facto top seed Daniil Medvedev awaiting him.

Emma Raducanu triumphed in a battle of US Open champions as she started her Australian Open campaign with victory over Sloane Stephens.

The 19-year-old stunned the tennis world when she claimed the title at Flushing Meadows last year after progressing all the way through the qualifying rounds and main draw without dropping a set.

The Briton struggled to build on those famous two weeks in New York, losing four of her next six matches including a 0-6 1-6 thrashing by Elena Rybakina at this month's Sydney Tennis Classic.

However, she put that result firmly behind her with an impressive 6-0 2-6 6-1 defeat of Stephens in her first match in the main draw of the Melbourne grand slam.

The first set was in keeping with Raducanu's US Open performance as she clinched it in just 17 minutes while dropping only four points.

But American Stephens, champion in her home slam in 2017, fought back in the second set and set up a decider with a forehand winner.

Yet the 17th seed responded well, marching into a 5-0 lead before serving out the match to set up a second-round clash with Danka Kovinic.

"I think both me and Sloane really put everything out there and gave it everything we had," she said.

"I think it was a really high-quality match, with some very long rallies. I'm very happy to come through against a great champion like her."

Nick Kyrgios compared the crowd during his Australian Open first-round win to a zoo as fans copied a famous Cristiano Ronaldo celebration at almost every point.

Cries of 'siuu' could be heard throughout much of the home favourite's straight-sets victory over Liam Broady, his first match since a Laver Cup defeat to Stefanos Tsitsipas in September.

The shouts were apparently mimicking Manchester United star Cristiano Ronaldo's famous goal celebration.

There were similar incidents during Andy Murray's battling five-set win over Nikoloz Basilashvili, as the five-time finalist won his first match at the Melbourne major since 2017.

The raucous crowds caused confusion as many observers wondered if Murray and Kyrgios were being booed on court, despite each player also enjoying huge support.

Kyrgios later explained he was not surprised to hear the noise from the stands but was taken aback by how long they persisted.

"It's just a stupid, f***, I can't believe they did it so much," he said after his 6-4 6-4 6-3 victory on John Cain Arena. "They were doing some Ronaldo thing. Ronaldo does it every time he scores.

"It's like... I thought they were going to do it for like 10 minutes. They did it for two and a half hours, like, every point. I don't know why. It was a zoo out there."

Murray had wondered if the crowd was turning on him during his epic 6-1 3-6 6-4 6-7 (5-7) 6-4 victory because he had been targeted during his practice session on Monday.

"Initially, I thought it was [booing] because there were some people booing during my practice yesterday," he said. "I have no idea what for! 

"But then, after a few times, it was like, no, they're doing that, I think it's like 'Siuu' or something that Ronaldo does when he scores. And, yeah, it was incredibly irritating!"

Kyrgios produced some superb if often unorthodox tennis as he booked a second-round clash with world number two Daniil Medvedev, who is the highest-ranked male in the draw following the refusal to allow Novak Djokovic to compete.

The 26-year-old would like to return to John Cain to aid his chances of improving his record against the Russian to 3-0.

"It's going to be a hell of an experience for me," he said. "He's probably 'the' best player in the world at the moment. So I'm pretty excited, I'm excited for that moment. That's why I play the game.

"I feel like those matches still excite me, to go out there and play the best in the world. That was always something I wanted to prove to people that someone like me could do, win those matches.

"I'm not going to go into it with a lot of expectation. I'm going to go out there, have some fun, play my game. I have a pretty set-in-stone game plan of what I need to do to have success.

"As I said, he's probably the best player in the world, he does everything extremely well. He's a hard worker, ticks all the boxes. I'm not going to even think about that now. To play it on John Cain would be – I'm just going to call it the Kyrgios Court – would be fun."

Andy Murray marked his return to the Australian Open with a thrilling five-set win over Nikoloz Basilashvili and immediately targeted "a deep run" in the competition.

The three-time grand slam winner edged 21st seed Basilashvili 6-1 3-6 6-4 6-7 (5-7) 6-4 in a first-round match that lasted three hours and 52 minutes.

It is Murray's first win at the tournament in five years in what was his first outing at Melbourne Park since 2019, when he thought he might have to retire.

Murray was playing on the same court where a retirement video was played after defeat to Roberto Bautista Agut three years ago.

But the 34-year-old has battled back from injury setbacks admirably and last week reached his first ATP Tour final since October 2019 at the Sydney Classic.

With Japan's Taro Daniel now standing between Murray and a place in round three of the Australian Open, the five-time beaten finalist is eager to make up for lost time.

"It's amazing to be back," Murray said in his on-court interview. "It's been a tough three, four years. 

"I have put a lot of work to be back here and I have played on this court many times and the atmosphere has been incredible. 

"I have always had fantastic support and this is the court I thought I potentially played my last match on. 

"But it is good to be back, winning a five-set battle like that. I could not ask for any more.

"I would love to have a deep run here if possible. It's something I have not had at one of the slams since I came back from the injury and it is something that motivates me."

Wild card Murray broke hard-hitting Basilashvili nine times on John Cain Arena, but he looked physically drained as the match dragged on.

The former world number one showed incredible resolve to take the deciding set, however, against an opponent that had lost just once in seven previous five-set battles.

"I will hopefully keep improving. There are things in my game I can definitely do better," Murray said.

"I have played some of my best tennis here over the years. I feel comfortable here and I hope I can do well here this tournament."

Daniil Medvedev is happy to be considered the favourite for the Australian Open title but says Rafael Nadal remains the man to beat at Melbourne Park.

World number two Medvedev is now the top-seeded player in the competition after Novak Djokovic was deported from Australia on Sunday.

Competing in his first grand slam since winning the US Open in September, Medvedev made a solid start by seeing off Henri Laaksonen 6-1 6-4 7-6 (7-3) on Tuesday.

The Russian, who lost last year's Australian Open final to Djokovic in straight sets, will now take on either Liam Broady or Nick Kyrgios in round two.

He is aiming to become the first man in the Open Era to follow up his maiden Grand Slam title with another in his next major appearance.

Medvedev is not shying away from the spotlight, but the 25-year-old considers Nadal the real favourite for the trophy because of his incredible record.

"I like pressure but last year I started well here in Australia in the ATP Cup and I managed to be in the final here," he said.

"The tournaments in Australia are always really important for me. I like to play in Australia on hard courts. I want to do better here than I did last year but it's not going to be easy.

"But I always say whoever is the highest ranked is the favourite so this time I will go with Rafa because he has 20 Grand Slams."

The 20 major singles titles won by Nadal is equal to Djokovic and Roger Federer, who is also absent in Melbourne due to injury, as the most by a men's player.

Just one of those titles have come at the Australian Open, however, with the Spaniard – who beat Marcos Giron in his opening match on Monday – going all the way in 2009.

Nadal and Medvedev are in opposite sides of the draw and are on course to meet in the final, but many challengers await between now and then.

That path became a little clearer on Tuesday as world number eight Casper Ruud withdrew from the tournament due to an injured ankle.

Ruud had been due to face Alex Molcan in the first round, but his place will be taken by lucky loser Roman Safiullin.

Petra Kvitova was convincingly beaten to bow out of the Australian Open in straight sets in the first round on Tuesday.

The Czech 20th seed, a finalist in Melbourne in 2019, was crushed 6-2 6-2 by Romanian Sorana Cirstea on John Cain Arena.

Kvitova produced a staggering 39 unforced errors with just seven winners to bow out in 71 minutes.

It continued a mixed record at Melbourne Park for the two-time Wimbledon champion.

Kvitova has now bowed out of a grand slam in the first round 11 times – with four of those coming at the Australian Open.

Cirstea will face either Misaki Doi or Kristina Kucova in this year's second round.

The 31-year-old also beat Kvitova at the Australian Open last year – in the second round.

Coco Gauff reflected on a hugely disappointing Australian Open defeat as the two leading United States players exited the women's draw on day one in Melbourne.

Gauff is ranked 16th, closing on top American Sofia Kenin in 13th, but neither advanced to the second round on Monday.

The 17-year-old was stunned 6-4 6-2 by Wang Qiang in a sloppy display that included 38 unforced errors, with 21 in a second set in which she fell 5-0 behind.

Meanwhile, Kenin was beaten by compatriot Madison Keys, who came into the tournament in high spirits having won her sixth career title – and first since 2019 – at the Adelaide International 2. That run included a semi-final defeat of Gauff.

After her latest loss, Gauff said: "I think just everything disappointed me about today.

"I feel like in the pre-season I worked really hard, and I felt like I was ready to have a good run here. Today I just didn't perform well.

"I think there's a lot to learn from. I think I was playing a little bit tighter than normal.

"So I think next time coming into the first round of a slam, especially after a tough week before, I think I need to just play more free and focus on the moment."

Keys is playing with that freedom, eager to move on from a dismal 2021 in which she won only 11 matches.

"I'm not taking it quite as seriously, that's the biggest difference this year," she said.

Keys already has seven wins in eight matches in 2022, defeating fellow Americans in each of her past three outings.

Of the win over 2020 champion Kenin, she said: "At this point every first round is tough, but when you have to go up against a grand slam champion it's never easy.

"I think knowing that she was going to compete so well, I just had a really good mentality and attitude. I had a couple of opportunities I didn't really capitalise upon and I was able to reset and continue to play well.

"I had my first real run in a slam here, I missed last year, so absolutely ecstatic to be back in Melbourne. It would mean the world to have another run here."

Novak Djokovic could miss out on defending another of his Grand Slam titles, with France passing new vaccination laws that may threaten his ability to compete at Roland Garros later this year.

The 34-year-old will not defend his Australian Open title, with a drawn-out saga concerning his vaccination status culminating in his visa being cancelled for a second time after an intervention from Australian immigration minister Alex Hawke.

But the controversy surrounding the 20-time Grand Slam winner could be set to continue, with French parliament passing stringent vaccination laws ahead of May's French Open.

After French lawmakers comfortably passed the new measures, proof of vaccination status will soon be required to enter a wide variety of public places, including sports stadiums, and the country's sports ministry says there will be no exemptions for professional athletes. 

"The rule is simple. The vaccine pass will be imposed, as soon as the law is promulgated, in establishments that were already subject to the health pass," the ministry said.

"This will apply to everyone who is a spectator or a professional sportsperson, and until further notice.

"Now, as far as Roland Garros is concerned, it is in May. The situation may change between now and then, and we hope that it will be more favourable. 

"So, we'll see, but clearly, there's no exemption."

Djokovic, who is tied with Rafael Nadal and Roger Federer for all-time Slam wins in the men's game, has come in for widespread criticism regarding his failure to be vaccinated against COVID-19, as well as for appearing in public in the days after testing positive for the virus last month.

Meanwhile, Djokovic has arrived back in his native Serbia, travelling via Dubai from Melbourne to Belgrade after losing a last-ditch court appeal to remain in the country.

World number one Ash Barty kicked off her Australian Open title bid with a convincing straight-sets victory over Ukrainian qualifier Lesia Tsurenko on Monday.

The two-time grand slam winner, whose previous best finish on home soil at Melbourne Park was a run to the semi-finals in 2020, prevailed 6-0 6-1 in a time of just 54 minutes.

Barty held serve throughout the one-sided contest with Tsurenko and is now unbroken in 41 successive service games across her last four matches.

"It's certainly nice to be back on home soil and playing as well as I did tonight. It was a lot of fun out here," Barty said in her on-court interview.

"I felt like it was nice and clean. End-to-end I did a good job in adjusting. Tonight it was just nice and solid to get out here and play a decent match and feel like I enjoyed it."

Tsurenko took Barty to three sets when they met in this competition two years ago, but the world number 113 was outclassed on this occasion.

Looking to build on her recent Adelaide International success, Barty eased through the first set as she dropped just 12 points.

Barty was just as dominant in the second set, but she squandered two match points in the sixth game to miss out on a double-bagel to begin her campaign in Melbourne.

Not that it mattered a great deal, though, as the 25-year-old emphatically served out the match to set up a meeting with Italian qualifier Lucia Bronzetti for a place in round three.

DATA SLAM: Barty makes statement start

Barty came through this first-round match with minimal stress and looks in great shape as she bids to become the first Australian to win here since 1978.

The pressure is no doubt on as the pre-tournament favourite, with no top-seeded player in the women's draw failing to make at least round four since Virginia Ruzici in 1979.

WINNERS/UNFORCED ERRORS

Barty – 14/17
Tsurenko – 4/21

ACES/DOUBLE FAULTS

Barty – 5/0
Tsurenko – 0/1

BREAK POINTS WON

Barty – 5/8
Tsurenko – 0/2

Rafael Nadal believes it would be "better for everybody" if Novak Djokovic was competing at the Australian Open, while declaring the situation a "mess".

Nadal sits level on 20 grand slam titles with Djokovic and Roger Federer but is the only one of tennis' 'Big Three' featuring in Melbourne.

Federer was ruled out due to ongoing knee injury problems, while Djokovic saw his visa cancelled for a second time on Sunday as he appealed Australia's refusal to let him into the country.

That ruling owed to Djokovic's unvaccinated status and Australia's coronavirus guidelines, leaving the Serbian unable to defend his Melbourne Park crown and seek a record-extending 21st grand slam.

Nadal has previously said he was "tired" of talking about the Djokovic saga, but the Spaniard again offered his thoughts after defeating Marcos Giron in the first round on Monday.

"Almost one week ago when he won in the first instance, the case, he was able to get back his visa and practising. I said the justice has spoken," Nadal told reporters.

"If the justice says his visa is valid and he's able to play here, the justice has spoken, so that's the fairest thing, that he deserves to play here. Yesterday the justice said another thing. I will never be against what the justice says.

"Another thing is what I believe personally and what I believe is the ideal situation personally, no?

"The ideal situation in the world of sport is that the best players are on court and playing the most important events. That's better for the sport without a doubt.

"If Novak Djokovic is playing here, it's better for everybody, no doubt about that. Another thing is what happened. As I said in the beginning, I can't say another thing because I believe that the situation is very clear now."

Pressed for an answer on his relationship with the 34-year-old world number one, Nadal wished his fellow competitor all the best.

"He's not the only one that did bad things in that case," Nadal added.

"Of course, there are more responsibilities on all for this terrible situation that we faced for the last two weeks. But of course, he is one of those responsible, too.

"So on a personal level, yes, I would like to see him playing here. If it is fair or not that he's playing here is another discussion that I don't want to talk anymore about that."

Nadal advanced to the second round in Melbourne with a cruising 6-1 6-4 6-2 victory over American Giron, who is ranked 66th in the world.

That was Nadal's fourth win of the year after triumphing at the Melbourne Summer Set and he appears to have battled through his foot injury, though he still expressed concerns over his fitness.

"It's been a very challenging few months… tough moments with a lot of doubts – there still are doubts," he said.

"But I am here and I can't be happier to be back in Australia in this amazing stadium.

"You never know when you come back from injury, which unfortunately I have a lot of experience with, how things will be, so you have to take it day by day. You have to forgive yourself if things aren't going the proper way."

Awaiting Nadal in the second round of the tournament will be either Australia's Thanasi Kokkinakis or Yannick Hanfmann of Germany.

Novak Djokovic could make an earlier-than-expected return to Australia despite the Serb facing a three-year ban from the country, according to prime minister Scott Morrison.

The world's number-one ranked player, who is level on 20 grand slam titles with Rafael Nadal and Roger Federer, saw his visa cancelled for a second time on public health grounds on Sunday.

Djokovic was attempting to overturn the original decision to refuse his entry into Australia, which was due to his unvaccinated status and the country's coronavirus rules.

That leaves the 34-year-old unable to defend his Australian Open title at Melbourne Park, while he was also handed an automatic three-year ban from the country under immigration law, unless Australia's immigration minister overrules the judgement.

Compelling or compassionate reasons would be needed to do so, but Morrison refused to rule out the possibility of Djokovic making an early return.

"I'm not going to precondition any of that or say anything that would not enable the minister to make the various calls he has to make," Morrison said to 2GB Radio on Monday.

"It does go over a three-year period, but there is the opportunity for [a person] to return in the right circumstances, and that will be considered at the time."

Morrison then insisted that Djokovic, who has already expressed his disappointment with the ruling, and any other entrant to Australia must comply with their rules.

"If you're someone coming from overseas, and there are conditions for you to enter this country, then you have to comply with them," he continued.

"This is about someone who sought to come to Australia and not comply with the entry rules at our border."

The Australian Open started on Monday, with Nadal advancing past Marcos Giron in his first-round match.

Naomi Osaka insisted she was unaffected by the saga surrounding Novak Djokovic ahead of the Australian Open.

Osaka opened her title defence at Melbourne Park with a 6-3 6-3 win over Colombian Camila Osorio on Monday.

The lead up to the year's first grand slam was overshadowed by the visa saga around Djokovic, who was deported from Australia on Sunday.

But Osaka, a four-time major winner, said the Serbian world number one's situation had no impact on her.

"I mean, to be completely honest, it didn't really affect me. I saw that it affected the men's draw a little bit so you might have to ask a men's player," she said.

"For me, my goal even before this whole situation is to just focus on myself more, what I need to do to become better.

"I wasn't really, I guess, looking at the news too often."

Osaka was unwilling to be drawn on whether Djokovic, whose visa was cancelled by immigration minister Alex Hawke, should be competing in the tournament.

A two-time champion in Melbourne, Osaka said her focus was on herself – with a second-round clash against Madison Brengle awaiting her.

"I feel like people focus on whatever they want to focus on. It's more like an individual question," Osaka said.

"Me, I'm a tennis player. I'll focus on my matches. You, as I guess an audience, focus on whatever is in the news, no?"

Rafael Nadal made a strong start to his Australian Open campaign, brushing past Marcos Giron in the opening round on Monday.

The Spanish superstar outclassed American Giron in a resounding 6-1 6-4 6-2 victory on Rod Laver Arena.

Nadal, who can claim the outright lead for most grand slams won by a man if he clinches his 21st in Melbourne, was in good form.

Playing his first major since last year's French Open, Nadal – the only former champion in the draw following Novak Djokovic's deportation from the country – was never troubled by Giron.

Nadal reeled off five consecutive games to take the opening set in 24 minutes.

His excellent first set was highlighted by two brilliant winners to break for 5-1 as he completely dominated Giron.

Nadal capitalised on his momentum by breaking in the opening game of the second set, Giron finally stopping the run by holding for 1-2.

The Spaniard maintained his lead and was forced to serve out the set, doing so to 15 to take complete control.

A backhand pass saw Nadal break again in the opening game of the third set on his way to a comprehensive win, with Thanasi Kokkinakis or Yannick Hanfmann awaiting him in the second round.

DATA SLAM: Nadal makes no mistake in opener

Only twice in his illustrious career has Nadal lost in the opening round of a grand slam – at Wimbledon in 2013 and the 2016 Australian Open.

But since his defeat to Fernando Verdasco in Melbourne six years ago, Nadal has not lost a set in the Australian Open first round, continuing that record against Giron.

WINNERS/UNFORCED ERRORS
Nadal – 34/26
Giron – 10/23

ACES/DOUBLE FAULTS
Nadal – 7/2
Giron – 2/2

BREAK POINTS WON
Nadal – 5/9
Giron – 0/2

Naomi Osaka moved into the Australian Open second round with a straight-sets victory over Camila Osorio on Monday.

The defending champion was largely untroubled by 20-year-old Colombian Osorio, easing to a 6-3 6-3 victory in 68 minutes on Rod Laver Arena.

Osaka, a four-time grand slam winner, has now won 23 of her past 24 matches in Melbourne.

It means a fourth-round showdown between Osaka and world number one Ash Barty remains on the cards.

Osaka made an imperious start and raced into a 5-0 lead after 16 minutes, on the back of eight winners, plus seven unforced errors from Osorio.

Incredibly, Osorio – who was growing in belief – had chances to get back on serve when Osaka was trying to close out the set, but the two-time champion in Melbourne managed to seal it 6-3.

The energetic Osorio was encouraging herself throughout while matching Osaka, who broke for a 2-1 lead in the second set.

In the end, Osaka proved too good despite a decent first-round test, moving into a meeting with either Dayana Yastremska or Madison Brengle.

DATA SLAM: Osaka's first-round record remains strong

Osaka is rarely troubled in the opening round of grand slams. The star is now 19-2 in the first round at majors.

Another challenge awaits. Osaka has never defended any of her major crowns and the last player to defend the women's title at Melbourne Park was Victoria Azarenka (2012 and 2013).

WINNERS/UNFORCED ERRORS
Osaka – 19/28
Osorio – 5/15

ACES/DOUBLE FAULTS
Osaka – 4/3
Osorio – 1/4

BREAK POINTS WON
Osaka – 4/6
Osorio – 1/5

Novak Djokovic will be banned from Australia for three years after the world number one's visa cancellation was upheld, the federal government has confirmed.

The 20-time Grand Slam winner failed in his bid to overturn a decision from the government to cancel his visa on public health grounds at the Federal Court in Melbourne on Sunday.

Djokovic, who is unvaccinated against COVID-19, is therefore unable to participate in the Australian Open, where he was due to launch his quest for a record-extending 10th title against fellow Serbian Miomir Kecmanovic on Monday.

After departing Australia, he will now be unable to return for the next three years, as is standard for the deportation order under the Migration Act – although this is subject to application and he could be permitted to return before then.

However, as it stands the 34-year-old would miss the next three editions of the slam. 

Speaking on the Today Show, minister for home affairs Karen Andrews said: "The outcome of the process that went before the Federal Court and their determinations – the visa was cancelled by [immigration] minister Hawke.

"That cancellation was upheld by the Federal Court, so as a result of that, he will be banned from entry for three years into the country.

"Now there are some compelling reasons that may be looked at, but that's all hypothetical at this point. Any application will be reviewed on its merits."

The long-running saga began after Djokovic was held at an airport in Melbourne when he arrived in the country on January 6.

The world number one won an appeal to overturn the first bid to deport him from the country, but immigration minister Hawke used his powers to again cancel the visa on Friday and Djokovic left Australia late on Sunday.