Barbora Krejcikova saved seven match points on her way to beating Anett Kontaveit in a thrilling Sydney Tennis Classic semi-final on Friday.

The world number four prevailed 0-6 6-4 7-6 (14-12) in a match that went the distance and will take on Paula Badosa, who beat in-form Daria Kasatkina in the other semi-final.

Krejcikova had lost five in a row against top-10 players and was soundly beaten in the first set, but she held in the second and earned the only break in the ninth game to level up. 

That set up an incredible decider, which fourth seed Kontaveit led 6-5, but she could not take the first three of her match points as Krejcikova battled valiantly to force a tie-break.

Krejcikova felt her opponent's pain as she then squandered two match points of her own when leading 6-4. 

It appeared neither player wanted to win as two more match points went begging for Krejcikova and four for Kontaveit in what turned into a real classic.

But Krejcikova eventually took her fifth opportunity to see off Kontaveit and reach a sixth WTA singles final.

"I think from both sides it was a really, really tough match," Krejcikova said. "I think we played wonderful tennis. 

"It was very, very tight, and I'm really happy that I was able to hold the nerves better and that I won this match.

"I was just playing, just trying to fight for every single ball. When I had those match points down, I was just trying to figure out how to build up the point and how to win the point."

Badosa awaits Krejcikova in Saturday's final after beating Kasatkina in a match with far fewer twists and turns.

Competing in her second semi-final in as many weeks, it was similar disappointment for Kasatkina as she fell to a 6-2 6-2 loss.

French Open quarter-finalist Badosa hit 26 winners to Kasatkina's 12 and did not look back after winning 14 of the opening 16 points.

At the Adelaide International 2, meanwhile, it will be an all-American final as Madison Keys and Alison Riske advanced past Tamara Zidansek and Coco Gauff respectively.

Riske was given a walkover win against Zidansek, who withdrew with an abdominal injury, while Keys beat compatriot Gauff in three sets.

Andy Murray powered through to his first ATP Tour final since October 2019 after a stellar win over Reilly Opelka at the Sydney Classic.

Murray won 6-7 (6-8) 6-4 6-4 against his American opponent, with fourth seed and world number 25 Opelka undone by the British wildcard.

Three years have passed since Murray came to Australia and indicated he was close to retirement due to hip trouble.

There have been highs and lows since then as the three-time grand slam winner has fought to resuscitate his career. His lone ATP final appearance since that point came at the 2019 European Open in Antwerp, where he beat Stan Wawrinka to land a surprise title.

Now he is back in another title match, for what will be just his fourth final on the main tour since the end of the 2016 season, when he reached world number one status.

Opelka is renowned as a big server and duly sent down 20 aces and four double faults, but Murray showed he can compete on that front too with 16 aces and no doubles.

The Scot also won an impressive 88 per cent of points when he landed his first ball in court, and his serve was not broken at any point.

Murray was awaiting the winner of the second semi-final between his fellow Briton Dan Evans and Russian Aslan Karatsev.

Five-time Australian Open runner-up Murray has been drawn to face Georgian Nikoloz Basilashvili in the first round of the grand slam at Melbourne Park next week. He beat 23rd-ranked Basilashvili in round two in Sydney.

World number one Novak Djokovic has had his Australian visa revoked for a second time and now faces being deported from the country.

Djokovic won an appeal on Monday to remain in the country, but immigration minister Alex Hawke used separate powers in Australia's Migration Act to again cancel the visa.

The Serbian must now lodge a fresh legal challenge should he wish to defend his Australian Open title, with the tournament set to begin next Monday. 

Novak Djokovic has had his Australian visa revoked for a second time and now faces being deported from the country.

Novak Djokovic has had his visa cancelled for a second time by the Australian government and faces deportation.

Novak Djokovic put the Australian Open at risk and has made other participants "look like fools" by turning up for the tournament unvaccinated, according to Stefanos Tsitsipas.

World number one Djokovic was paired with Miomir Kecmanovic in Thursday's draw for the opening round, but it remains uncertain whether he will even take part in the first grand slam of the year.

The Serbian was last week given a medical exemption to enter Australia, despite not being vaccinated, only for border officials to block it upon his arrival.

Djokovic was detained for four days while waiting to appeal the case on Monday, which went in his favour at Melbourne Circuit Court.

He has since started training ahead of the Australian Open, which begins next Monday, though immigration minister Alex Hawke may yet cancel his visa for a second time.

The 34-year-old is also being investigated for breaching isolation rules in December after testing positive for COVID-19.

And as a decision regarding whether he can stay in Australia and defend his title is dragged out, Tsitsipas has become the highest-profile tennis figure to criticise Djokovic for his conduct.

"He has been playing by his own rules," world number four Tsitsipas told Indian outlet WION.

"No one would have thought: 'I can come to Australia unvaccinated and not have to follow the protocols they gave me'.

"For Novak it worked another way. It takes a lot of daring to do. Putting a Grand Slam at risk – I don't think many players would do that."

Tsitsipas, who was defeated by Djokovic in last year's French Open final, added: "There are two ways to look at it.

"One way is that almost every single player has been vaccinated and did what they had to do in order to come and play in Australia.

"We have all followed the protocols to come and compete in Australia and been very disciplined in that.

"It seems like not everyone is playing by the rules of how Tennis Australia and some governments have been putting things.

"A very small minority chose to follow their own way. It makes the majority look like they are all fools."

Djokovic has spent the past four days training on court in preparation for the Australian Open, which he has won a record nine times, including in each of the last three years.

But weighing in on the debate on Thursday, Australian deputy prime minister Barnaby Joyce said the 20-time grand slam winner must "abide by the rules" if he is to remain in the country.

"You have to be frank – the vast majority of Australians said they didn't like the idea that another individual, whether they're a tennis player or the king of Spain or the queen of England, can come up here and have a different set of rules to what everybody else has to deal with," Joyce said.

"Let's see where it goes from here… I've made my views clear. I might not agree with the fact that I have to be tested to go from New South Wales into Queensland but I do [it’. Why? Because that is the law.

"He is no better. He is still a child of God like the rest of us, isn't he? So he has got to abide by the laws."

Daria Kasatkina reached her second semi-final in as many weeks with a straight-sets victory over Garbine Muguruza at the Sydney Tennis Classic on Wednesday.

The world number 26, who was defeated by Amanda Anisimova in the Melbourne Summer Set 2 semi-finals last week, beat second seed Muguruza 6-4 6-4.

Kasatkina held throughout the opening set, landing 67 per cent of her first serves, and saw the job through in the second despite a couple of early breaks for Muguruza.

It is the Russian's first win over a top-five opponent since beating Caroline Wozniacki at the 2018 French Open.

She will now face fifth seed Paula Badosa, who saw off Olympic gold medallist Belinda Bencic 7-6 (8-6) 3-6 6-3 in an entertaining match lasting two hours and 35 minutes.

The other semi-final in Sydney will be contested between Anett Kontaveit and Barbora Krejcikova, who advanced past Ons Jabeur and Caroline Garcia respectively.

Krejcikova proved far too strong for Garcia, prevailing 6-0 6-2 in 70 minutes, while Kontaveit was in action for just 43 minutes before being handed a walkover win in her match.

Jabeur had targeted "payback" against Kontaveit after her quarter-final opponent pipped her to the final WTA Finals spot in November, but injury cost her the chance to do so.

Having lost the first set 6-4, Jabeur – who eliminated Petra Kvitova in the previous round – felt unable to continue due to a lower back injury.

At the Adelaide International 2, three of the five Americans in action made it through to the semi-finals.

Alison Riske's clash with compatriot Madison Brengle ended early due to the latter retiring with the first set level at 3-3. Tamara Zidansek awaits Riske after beating Lauren Davis 7-6 (7-4) 7-6 (9-7).

Coco Gauff and Madison Keys will meet in the other semi-final, meanwhile, following victories over Ana Konjuh and Ludmilla Samsonova in two and three sets respectively.

Andy Murray strode through to the semi-finals at the Sydney Classic after opponent David Goffin was forced to retire with an injury.

Murray won the opening set 6-2 before eighth seed Goffin, who had been receiving treatment on his knee, determined he could no longer continue.

It is the first time the 34-year-old Murray has reached a semi-final on the ATP Tour since winning the European Open title in October 2019.

Though not ideal circumstances, Murray will at least be glad of the extra rest after his three-hour encounter with world number 23 Nikoloz Basilashvili in the second round. The Scot has also been drawn to play Basilashvili in the first round of the Australian Open.

Murray will face Reilly Opelka in the last four in Sydney after the American beat compatriot Brandon Nakashima 7-6 (7-4) 6-2 to advance.

Top seed Aslan Karatsev was made to work for his win against Italy's Lorenzo Sonego but secured a 6-3 3-6 6-2 victory to book his semi-final place against Briton Dan Evans, who defeated American Maxime Cressy 6-4 7-6 (7-5). Cressy reached the final of the Melbourne Summer Set tournament last week.

At the Adelaide International 2 event, third seed Karen Khachanov tumbled out after losing in straight sets to Arthur Rinderknech, the Frenchman coming through a 7-6 (9-7) 7-5 winner.

Rinderknech will face compatriot Corentin Moutet in the semi-finals after the qualifier overcame Thiago Monteiro 6-4 6-4.

Fourth seed Marin Cilic battled to beat American Tommy Paul 6-4 2-6 6-3, and a test awaits against Thanasi Kokkinakis who defeated fellow Australian Aleksandar Vukic 6-7 (5-7) 6-3 6-2.

Novak Djokovic has been drawn against Miomir Kecmanovic in the opening round of the Australian Open as the defending champion awaits to hear if he can stay in the country.

World number one Djokovic was last week given a medical exemption to enter Australia, despite not being vaccinated, only for border officials to block it upon his arrival.

The 20-time grand slam winner was detained for four days while waiting to appeal the case on Monday, which went in his favour at Melbourne Circuit Court.

Djokovic has since started training ahead of the Australian Open, which begins next Monday, though immigration minister Alex Hawke may yet cancel his visa for a second time. 

A decision on whether Djokovic can compete in the first grand slam of the year, which he has won a record nine times, could be made on Thursday.

Should he be given the all clear to take part, Djokovic will face compatriot Kecmanovic in the first round at Melbourne Park.

Thursday's draw, which was delayed by one hour and 15 minutes for unspecified reasons, also saw fellow 20-time grand slam winner Rafael Nadal paired with Marcos Giron.

Nadal is in the same half of the draw as Djokovic, meaning the pair could meet in the semi-finals, while third seed Alexander Zverev is also in the top half.

Second seed and 2021 finalist Daniil Medvedev is in the bottom half along with Stefanos Tsitsipas and will take on Henri Laaksonen first up.

In the women's draw, Australia's world number one Ash Barty will begin her quest for glory on home soil against a qualifier.

The top seed is on a collision course with defending champion Naomi Osaka, who goes face-to-face with Camila Osorio in round one on her return from a four-month break.

Reigning US Open winner Emma Raducanu is up against Sloane Stephens, who won the New York major in 2017, while Storm Sanders awaits second seed Aryna Sabalenka.

Novak Djokovic has been labelled "selfish" by Joao Sousa for arriving at the Australian Open unvaccinated, but uncertainty still surrounds the Serbian's participation in the event. 

World number one Djokovic was last week given a medical exemption to enter Australia, despite not being vaccinated, only for border officials to block it upon his arrival.

The 20-time grand slam winner was detained for four days while waiting to appeal the case on Monday, which went in his favour at Melbourne Circuit Court.

Djokovic has since started training ahead of the Australian Open, which begins on January 17, though immigration minister Alex Hawke may yet cancel his visa for a second time.

Should the 34-year-old be given the green light to compete at Melbourne Park, however, world number 140 Sousa says it will not sit right with others taking part.

"I respect that he fights for what he believes and I can be empathetic with what he is going through in Australia," Sousa is quoted as saying by Portuguese outlet Bola Amarela.

"But it's a bit selfish from him to arrive here as the only player unvaccinated. It's tough for us players to accept that."

Djokovic has been widely criticised for appearing on social media to mingle with the public in a series of appearances after returning a positive COVID-19 test on December 16.

In a statement issued on Wednesday, Djokovic accepted he had made "an error of judgement" going ahead with an interview with French publication L'Equipe around that time.

Franck Ramella, the French journalist who conducted the 33-minute interview while Djokovic was COVID-19 positive, confirmed the tennis star wore a mask the whole time.

A decision on whether Djokovic can defend the title he has won a record nine times could be made on Thursday, when the draw for the main tournament is scheduled to take place.

Andy Murray drew on his never-say-die attitude to beat Nikoloz Basilashvili in a late-night thriller and book a quarter-final berth at the Sydney Tennis Classic.

The former world number one lost the first set despite leading 4-1 and 5-2, and was pegged back again having broken for a 3-2 lead in the second.

But Murray is renowned for being a fighter on court and so it proved again as the three-time grand slam winner defeated his Georgian opponent 6-7 (4-7) 7-6 (7-3) 6-3 in a match that finished after midnight in Sydney.

It marked further joy for Murray against world number 23 Basilashvili, an opponent he defeated in four sets in the first round of Wimbledon last year.

Murray's fellow Briton Dan Evans continued a perfect start to 2022 as he breezed past Pedro Martinez 6-2 6-3 in 85 minutes without facing a break point.

Top seed Aslan Karatsev defeated Miomir Kecmanovic 7-5 6-4 for his first win of the year, while Reilly Opelka (4), Lorenzo Sonego (5) and David Goffin (8) – who is Murray's last-eight opponent - all coasted through in straight sets.

However, Fabio Fognini (7) was a seed who did fall, as he lost 7-6 (9-7) 7-6 (8-6) to American Brandon Nakashima.

At the Adelaide International 2 tournament, top seed Gael Monfils – who triumphed at last week's Adelaide event – withdrew with neck pain in the deciding set of his second-round tie against Thiago Monteiro.

John Isner (2) also bit the dust against wildcard and home favourite Thanasi Kokkinakis with each set going to a tie-break.

Karen Khachanov (3) and Marin Cilic (4) safely made it through in straight sets against Gianluca Mager and Jaume Munar respectively, but Marton Fucsovics (8) was beaten 6-2 6-2 by Frenchman Corentin Moutet.

Tommy Paul, Arthur Rinderknech and Aleksandar Vukic all progressed.

Ons Jabeur eliminated Petra Kvitova from the Sydney Tennis Classic and immediately set her sights on "payback" against next opponent Anett Kontaveit.

World number 10 Jabeur had lost her previous four meetings with Kvitova, but she emerged victorious on Wednesday with a 6-4 6-4 win to reach the quarter-finals.

Jabeur recovered from 3-1 down in both sets at Ken Rosewall Arena and converted half of her six break points on her way to setting up a meeting with Kontaveit.

The two will resume their friendly rivalry after Kontaveit overcame Romanian qualifier Elena-Gabriela Ruse 6-3 6-1.

Jabeur lost out to Kontaveit for the last WTA Finals spot in November and is now seeking revenge in the final warm-up event ahead of the Australian Open.

"Anett is a great player. We had our moments last year," Jabeur said. "I told her, 'You're obsessed with me, you always follow me, so stop [smiling]'.

"I know the pressure is on me, not really on her. But maybe I can get some payback for last year."

Garbine Muguruza is also through to the last eight in Sydney thanks to a 6-1 7-6 (7-4) win against Ekaterina Alexandrova.

The two-time major champion will face Daria Kasatkina, who beat Elise Mertens 6-3 6-4, for a place in the semi-finals.

Third seed Barbora Krejcikova survived a brief fightback from Jaqueline Cristian to advance 6-1 7-5, meanwhile, and Paula Badosa beat home hope Ajla Tomljanovic 6-3 6-4.

There was disappointment for in-form Elena Rybakina, who thrashed Emma Raducanu on Tuesday but had to withdraw from her clash with Caroline Garcia with a thigh injury.

At the Adelaide International 2, Coco Gauff prevailed 6-3 5-7 6-3 in her battle of the teenagers showdown with Marta Kostyuk.

Gauff is one of five Americans in the quarter-finals along with Madison Brengle, Alison Riske, Lauren Davis and Madison Keys, who beat Tereza Martincova 6-1 6-3 to advance.

Novak Djokovic has moved to "address the continued misinformation" about his attendance at events in December after he had tested positive for COVID-19 prior to his arrival in Australia.

The world number one, who won an appeal on Monday over his visa cancellation after being detained on arrival in Melbourne last week, wrote a six-panel post on Instagram on Wednesday amid ongoing discussion on his participation at the upcoming Australian Open due to commence on January 17.

Djokovic has come under fire for allegedly incorrectly filling out his Australian Travel Declaration form, with Immigration Minister Alex Hawked stating he would "thoroughly consider" the false declaration.

The 20-time major winner said in the post that this was a "human error" and that he had since provided additional information to the Australian Government to clarify the matter.

The Serbian has also been criticised for appearing on social media to mingle with the public in a series of appearances after returning a positive test for COVID-19 on December 16.

Fellow Grand Slam winner Andy Murray had said on Tuesday that Djokovic needed to explain why he was out in public when positive with COVID-19, with Djokovic explaining his version of events.

"I attended a basketball game in Belgrade on 14 December after which it was reported that a number of people tested positive with COVID-19," Djokovic wrote.

"Despite having no COVID symptoms, I took a rapid antigen test on 16 December which was negative, and out of an abundance of caution, also took an official and approved PCR test on that same day.

"The next day I attended a tennis event in Belgrade to present awards to children and took a rapid antigen test before going to the event, and it was negative. I was asymptomatic and felt good, and I had not received the notification of a positive PCR test result until after that event.

"The next day, on 18 December I was at my tennis centre in Belgrade to fulfil a long-standing commitment for a L'Equipe interview and photoshoot. I cancelled all other events except for the L'Equipe interview.

"I felt obliged to go ahead and conduct the L'Equipe interview as I didn't want to let the journalist down, but did ensure I socially distanced and wore a mask except when my photograph was being taken.

"While I went home after the interview to isolate for the required period, on reflection, this was an error of judgement and I accept that I should have rescheduled this commitment."

Djokovic said the false declaration, where it was written he had not travelled in the 14 days prior to his arrival in Australia, was a "human error" and "not deliberate".

"On the issue of my travel declaration, this was submitted by my support team on my behalf - as I told immigration officials on my arrival - and my agent sincerely apologises for the administrative mistake in ticking the incorrect box about my previous travel before coming to Australia," Djokovic said.

"This was a human error and certainly not deliberate. We are living in challenging times in a global pandemic and sometimes these mistakes can occur. Today, my team has provided additional information to the Australian Government to clarify this matter."

Novak Djokovic has moved to "address the continued misinformation" about his attendance at events in December after he had tested positive for COVID-19 prior to his arrival in Australia.

The world number one, who won an appeal on Monday over his visa cancellation after being detained on arrival in Melbourne last week, wrote a six-panel post on Instagram on Wednesday amid ongoing discussion on his participation at the upcoming Australian Open.

Djokovic has come under fire for allegedly incorrectly filling out his Australian Travel Declaration form, with Australian Immigration Minister Alex Hawked stating he would "thoroughly consider" the false declaration.

The 20-time major winner said in the post that this was a "human error" and that he had since provided additional information to the Australian Government to clarify the matter.

The Serbian has also been criticized for appearing on social media to mingle with the public in a series of appearances after returning a positive test for COVID-19 on December 16 but he moved to clarify that situation too.

Fellow Grand Slam winner Andy Murray had said on Tuesday that Djokovic needed to explain why he was out in public when positive with COVID-19.

"I attended a basketball game in Belgrade on 14 December after which it was reported that a number of people tested positive with COVID-19," Djokovic wrote.

"Despite having no COVID symptoms, I took a rapid antigen test on 16 December which was negative, and out of an abundance of caution, also took an official and approved PCR test on that same day.

"The next day I attended a tennis event in Belgrade to present awards to children and took a rapid antigen test before going to the event, and it was negative. I was asymptomatic and felt good, and I had not received the notification of a positive PCR test result until after that event.

"The next day, on 18 December I was at my tennis centre in Belgrade to fulfil a long-standing commitment for a L'Equipe interview and photoshoot. I cancelled all other events except for the L'Equipe interview.

"I felt obliged to go ahead and conduct the L'Equipe interview as I didn't want to let the journalist down, but did ensure I socially distanced and wore a mask except when my photograph was being taken.

"While I went home after the interview to isolate for the required period, on reflection, this was an error of judgement and I accept that I should have rescheduled this commitment."

Djokovic said the false declaration, where it was written he had not travelled in the 14 days prior to his arrival in Australia, was a "human error" and "not deliberate".

"On the issue of my travel declaration, this was submitted by my support team on my behalf - as I told immigration officials on my arrival - and my agent sincerely apologises for the administrative mistake in ticking the incorrect box about my previous travel before coming to Australia," Djokovic said.

"This was a human error and certainly not deliberate. We are living in challenging times in a global pandemic and sometimes these mistakes can occur. Today, my team has provided additional information to the Australian Government to clarify this matter."

Andy Murray says there are "questions that need to be answered" by Novak Djokovic before the world number one plays in the Australian Open.

Frustrated by the Djokovic saga becoming a distraction, Murray wants the world number one to tie up loose ends at the earliest opportunity, so the tennis world can move on.

There remain grey areas surrounding the Serbian's commitment to isolating after testing positive for COVID-19 on December 16 last year.

A maskless Djokovic was pictured at a Belgrade tennis club's awards event on December 17, and L'Equipe has reported he took part in a photo shoot and interview for the French sports newspaper on the following day. It remains to be established whether Djokovic knew by that stage that he had returned a positive test.

The coronavirus infection allowed Djokovic to qualify for a medical exemption to play at Melbourne Park, and the 20-time grand slam winner confirmed on arrival in Australia that he is unvaccinated, before his visa was initially revoked.

It is not known what his plans would have been for the Australian Open had he not tested positive, as players are required by Tennis Australia to be either vaccinated or have a compelling case for an exemption.

Djokovic was released from a four-day detention in a Melbourne hotel following a court hearing on Monday, and long-time friend and rival Murray said: "It's positive that he's not in detention anymore. He won in court, so that's a positive thing for him, and hopefully we'll be able to concentrate on the tennis now.

"I think there is still a few questions that need to be answered around the isolation and stuff, which I'm sure we'll hear from him in the next few days, but I'm obviously here to try and play and win tournaments."

Australia's immigration minister Alex Hawke could still cancel Djokovic's visa on new grounds, meaning his participation at the year's first grand slam, which begins next Monday, is not yet 100 per cent confirmed. The nine-time Australian Open champion will be seeking a record 21st men's grand slam singles title if cleared to play.

Murray, who won in the first round of the Sydney Classic on Tuesday, is conscious of the Djokovic saga dragging on.

It was clear the Briton believes an important step forward is for Djokovic to answer journalists' questions on the matter.

"It's the first match that I have played here, or won here, in over three years, and this is where the situations like this are frustrating for players," said Murray. "I want to come off and talk about my tennis and what's happening there, not talking about situations like that.

"So I'm hoping that we can move on from it now. He won in court, which is good. It looks like he's going to be able to play and compete in the Australian Open. We do want the best players there.

"But like I said, I think there is still a few questions to be answered. It's up to the press to ask about that and for Novak to clarify, so let's wait to see what he says."