Australian Open fans are set to return to Melbourne Park from Thursday after the Victorian government confirmed the lifting of restrictions following a five-day lockdown amid the coronavirus pandemic.

While the number of supporters set to attend remains unknown, fans will be back in their seats for the beginning of the Australian Open semi-finals, with record-chasing Serena Williams set to face three-time grand slam champion Naomi Osaka in Melbourne.

Defending men's champion Novak Djokovic will play the tournament’s surprise package, Russian qualifier Aslan Karatsev - who is the first player to reach a semi-final on their grand slam debut.

Djokovic was on court when the lockdown came into effect last Friday, with the five-day "circuit-breaker" designed to control an outbreak of the UK coronavirus strain.

Part of the third round, the fourth round and quarter-finals of singles action were played behind closed doors after a series of outbreaks in Victoria.

The state has recorded 12 more active cases since the lockdown was implemented but, with none discovered in the past 24 hours, Victorian premier Daniel Andrews announced restrictions will be eased.

"I'm very, very pleased to announce that the restrictions will come off, almost all of them, at midnight tonight," Andrews told reporters on Wednesday.

"From 11:59pm [Wednesday local time], the restrictions will be dropped [but] masks will be required indoors and outdoors when you can't socially distance."

The stage-four restrictions meant residents could not leave their homes for any other reason than work, shopping for groceries, exercise or the giving or receiving of medial care.

This year's delayed Australian Open has had crowds capped at 30,000 per day with original COVID-19 restrictions, but new limits are yet to be determined for the rest of the tournament.

"There will be meetings this afternoon [to determine] what is a safe number," Andrews said.

"They already were reduced, they may have to be reduced further, but that matter will be resolved in the next few hours."

Ben Simmons believes his potential is "scary" after scoring a career-high 42 points against the Utah Jazz.

Playing at center in the absence of Joel Embiid for the Philadelphia 76ers, Simmons converted 15 of his 26 field goals, adding 12 assists and nine rebounds in a fantastic performance.

Utah still won the game 134-123 to make it 19 wins from 20.

Despite playing in a third straight loss, Simmons believes the record night shows he has made huge strides over recent weeks.

"I feel like I'm figuring it out," Simmons said after the game.

"Obviously, my scoring has been a lot higher the past five, six games.

"As long as I can keep doing that and stay locked in and keep working on my mental [game], I think it's scary.

"You have got to keep your foot down. Keep pushing forward offensively with me. Stay dominant - I know what I'm capable of.

"It felt good that I was able to dominate offensively. Defensively I did okay, not great. Offensively, I definitely had to pick up the slack especially if Joel is out. So yes [it was probably my most aggressive game].

"I loved when I saw Rudy [Gobert] was guarding me. I love being able to go at somebody like that. I felt like it was a little bit disrespectful to put him on me, but it is what it is.

"Honestly, I've just been working on my mentality and mental [game] a lot these past few weeks.

"It's not easy to do that. Your mindset will change the way you play or certain things in the game that come natural for certain people. It is all mental.

"People don't realise your mentality is a huge part of the game. For me I continue to work on that. I'm just trying to get better and progress my game and get to that next level.

"But we wanted to get this win bad. We didn't get it, so we've got to move on."

Getting Simmons matched up with Gobert was exactly what coach Doc Rivers had in mind, while he also praised Tobias Harris for a 36-point display.

Rivers said: "I didn't know we were going to get the 42 points out of him! But he did everything - he guarded, did a good job. Played with pace.

"We anticipated once Joel scratched that the lineup that we put on the floor, we were trying to create a lineup where Gobert would guard Ben and that happened.

"The key for us was getting stops and getting it to Ben and getting up the floor. We just felt like there was no way anybody was going to stay with Ben, especially a center.

"Tobias [Harris] was phenomenal as well. Look at those two guys, man!

"Harris has to be straight line, aggressive and powerful. When he plays like that, he's hard to deal with. He played a very decisive game and had very few indecisive plays.

"He is really keeping the game simple, playing with great force, scoring from the three[-point line], off the dribble and the post. He's doing exactly what we believe he can do.

"[Embiid] was just a late scratch. They came to me and told me his back is still stiff. So I don't think this is a long term issue or anything like that. It's just a game missed."

The Sixers are still top of the Eastern Conference at 18-10 and host the Houston Rockets next on Wednesday.

Jordan Clarkson scored 40 points off the bench for the impressive Jazz, who lead the Western Conference with an NBA-best record of 23-5.

Novak Djokovic lost his temper but refused to let the prospect of Australian Open glory slip away as he edged out Alexander Zverev to reach the semi-finals.

The world number one destroyed a racket when trailing 3-1 in the third set, after he and Zverev split the opening two sets, and it was one of a number of moments when the Serbian showed heightened volatility during a 6-7 (6-8) 6-2 6-4 7-6 (8-6) win.

Still bothered by an abdominal problem that he sustained in the third round, Djokovic nevertheless strides on and will face Russian qualifier Aslan Karatsev for a place in the final.

Zverev, who played in a bright yellow headband and vest top, with a gold medallion hanging from his neck, will look back on an opportunity missed.

As well as that third-set lead, Zverev was also up a break at the start of the fourth, but the US Open runner-up lacked the composure to convert those hard-earned positions.

If Djokovic's racket-smashing was a tactical move designed to gee himself up and distract Zverev, then it worked a treat.

A nip-and-tuck opener had gone the way of German world number seven Zverev, who then made a wretched start to the second set and was 4-0 behind in the blink of an eye.

Just as momentum began to swing back Zverev's way in the third, Djokovic went into his rage, with a ball girl summoned to clear up the mess the 33-year-old created.

Back came Djokovic as double faults began to leak from Zverev's racket, and soon they were into a fourth set.

Zverev led 3-0 but Djokovic was not going away, seizing on mistakes from an opponent who by the end of the second tie-break of the match could only wonder what might have been.

An ace from Djokovic finished off the contest. After eight titles at Melbourne Park, a hunger for more continues to define his every performance in Australia.

"Emotionally I feel a little bit drained. We pushed each other to the limit," Djokovic said in his on-court interview.

"Other than in the second set I started pretty poorly in all the other three sets. I lost my service very early in the first, third and fourth and allowed him to swing through the ball a bit more, but I regained my focus.

"I broke that racket and things started to shift a little bit for me in a positive direction."

Aslan Karatsev said finding stability off the court has helped him become the revelation of this year's Australian Open after the qualifier marched on to the semi-finals.

The Russian became the first qualifier to reach the last four of a major since Vladimir Voltchkov, famously in borrowed shorts, did so in 2000 at Wimbledon.

It was Pete Sampras who eventually blew away Voltchkov's threat at the All England Club on his way to another title.

And it turns out there is a connection between Karatsev and Voltchkov, with both men now calling Minsk their home.

But whereas Voltchkov is Minsk born and bred, Karatsev has taken a roundabout route to setting down roots in the capital of Belarus.

He explained on Tuesday how he was born in the Russian city of Vladikavkaz before moving as a toddler to Israel with his family and living there until the age of 12, when he and his father returned to Russia, spending time in the city of Taganrog.

Tennis took him to training bases in Moscow, then Halle in Germany, Barcelona, and finally Minsk.

It is in Minsk that Karatsev has linked up with former ATP professional Yahor Yatsyk, a man only one year his senior but already settling into coaching.

As Grigor Dimitrov succumbed to injury and slid to a four-set defeat against Karatsev on Tuesday, the unlikely figure in the final four reflected on his long road to this point.

"Yes, I was moving I would say too much," Karatsev said of his nomadic existence.

"In the end I found a coach, Yahor Yatsyk, and this is the right guy for me. He's helped me a lot, more the mental part, and then of course there is the technical stuff as well.

"I like to work with him. We're living in Minsk. We're practicing there."

Karatsev is the lowest-ranked man to reach a grand slam semi-final since Goran Ivanisevic, who won Wimbledon in 2001 on a wildcard entry while ranked 125th in the world.

His charge through the draw makes him only the second qualifier to advance to the Australian Open last four, after Bob Giltinan in December 1977.

"Of course it's amazing that I passed to the semi-finals from qualifying," Karatsev said. "I'm just trying to enjoy the moment and not thinking about that too much and playing from round to round."

He and Yatsyk set the goal of reaching the top 100, which Karatsev had not managed before getting to Melbourne.

Before this fortnight he stood at 114th in the rankings, but he will hurtle to a double-digit ranking next week.

"I think the key is to find the right team, the right coach that I found. I was really lucky to find him," Karatsev said.

"We just met in one tournament. We were saying, 'Okay, let's try to work together', and it's really a big luck that we started to work together and I have a good team around me."

Before he encountered Yatsyk, who as a player did not crack the top 1,000 in singles, Karatsev had a brief moment when he wondered if he might not make the grade.

"There was a time when I was injured that was a difficult time for me because I recovered after the injury, and then 2017 started, and I started to play again, and again I felt the knee," Karatsev said. "I said, 'Whoa.' I quit again for two and a half months, almost three, and I think this is the most difficult part."

France had their Six Nations plans disrupted by a positive COVID-19 test that sent the squad into self-isolation on Tuesday.

The French Rugby Federation (FFR) also said head coach Fabien Galthie would be retested amid concerns he may have coronavirus.

It was another figure from within the France camp, who was not named, that returned a positive result following testing on Monday.

Announcing that news, the FFR said on Tuesday: "Following the PCR tests carried out last night in Marcoussis with the France XV, all the players tested negative, a member of the technical staff tested positive, as well as a suspicious and unproven case concerning Fabien Galthie who will be tested again this morning.

"In accordance with health protocol, all members of the team and management were isolated this morning. Interactions are kept to a minimum.

"An additional test at the National Rugby Centre will be carried out on Wednesday morning for the entire squad."

The squad are due to disperse later this week to be allowed a short time at home between matches, with France, who have won their opening two games, not in action again until they face Scotland on February 28 in Paris.

They scored a fine 15-13 win over Ireland in Dublin on Sunday to follow up the opening 50-10 victory over Italy.

The FFR statement added: "Tests will be carried out at home on Friday, as well as on Sunday evening at the National Rugby Centre when the squad reunites.

"The announcement of the 31 players for the Scotland match will take place this Wednesday evening, February 17."

Draymond Green fumed at how NBA players are being treated by teams and the league after Andre Drummond was pulled out of the Cleveland Cavaliers' game with the Golden State Warriors.

The Warriors cruised to a 129-98 win on Monday with Green registering 16 assists, tying his career high, and Steph Curry going off for 36 points.

But after the game Green talked little about the impressive outing and instead focused on the treatment of players.

The Cavs made a late call to sit center Drummond, who watched the game in street clothes, while they attempt to trade him.

Blake Griffin is in the same situation with the Detroit Pistons, with the team looking at moving him or buying him out.

Green was seen speaking to Drummond before tip-off and was frustrated when he faced the media after the game, also referencing a host of other players including James Harden.

"I would like to talk about something that's really bothering me," Green said. "And it's the treatment of players in this league.

"To watch Andre Drummond, before the game, sit on the sidelines, then go to the back, and to come out in street clothes because a team is going to trade him, it's b*******.

"Because when James Harden asked for a trade, and essentially dogged it, no one's going to fight back that James was dogging it his last days in Houston, but he was castrated for wanting to go to a different team.

"Everybody destroyed that man. Yet a team can come out and say, 'Oh, we want to trade a guy', and then that guy has to go sit, and if he doesn't stay professional, then he's a cancer and he's not good in someone's locker room, and he's the issue.

"We're seeing situations of Harrison Barnes getting pulled off the bench or DeMarcus Cousins finding out he's traded in an interview after the All-Star Game, and we continue to let this happen."

In previous seasons, Green was fined for giving his opinion that Devin Booker should leave the Phoenix Suns while Anthony Davis was punished for publicly requesting a trade.

He added: "I got fined for stating my opinion on what I thought should happen with another player, but teams can come out and continue to say, 'Oh, we're trading guys, we're not playing you.' Yet we're to stay professional.

"We talk all of this stuff about: 'You can't do this, you can't say this publicly.' Anthony Davis got fined I think $100,000 for demanding a trade, but you can say Andre Drummond's getting traded publicly and we're looking to trade him publicly, and he's to stay professional and just deal with it?

"And then when Kyrie Irving says, 'Oh, my mental health is off,' everybody goes crazy about that too. Do you not think that affects someone mentally?

"As much as we put into this game to be great, to come out here and be in shape, to produce for fans every single night, and most importantly, to help your team win, do you think that doesn't affect someone mentally?

"At some point, the players must be respected in these situations, and it's ridiculous, and I'm sick of seeing it."

Green and the 15-13 Warriors are at home against the Miami Heat on Wednesday.

Serena Williams is in the Australian Open semi-finals for the first time since she last won a grand slam title, beating Simona Halep to set up a mouthwatering clash with Naomi Osaka.

The American great gained revenge for her Wimbledon final defeat to the Romanian two seasons ago as she conjured a 6-3 6-3 win on Rod Laver Arena.

Halep dropped just four games in that stunning grass-court success in 2019, the third of four grand slam finals that Williams has lost since landing her 23rd major in Australia four years ago.

The 24th title has remained frustratingly elusive, with Williams one away from matching Margaret Court's record haul, but perhaps this is the week where that changes.

She must get past Osaka, her heir apparent as the figurehead for the women's game, but Williams showed her prowess in this match, devastatingly proving a point.

Her power won out, with 24 winners to just nine from Halep, although the 33 unforced errors from Williams showed there is room for improvement in precision.

The tone was set from the first point, Williams with a brilliant forehand service return winner on the forehand side on her way to an immediate break of serve.

Halep forced her way level but Williams raised the tempo in the sixth game and a deep forehand into the Romanian's backhand corner secured a 4-2 advantage.

Williams served out the set to love at the first opportunity but then dipped early in the second set, Halep pinching a break when the American volleyed waywardly at the net.

What proved a consistent theme was Halep's struggle to hit through her opponent, and the two-time grand slam winner could not capitalise on a 3-1 lead in that second set, dropping five successive games as the 39-year-old Williams began to turn on some vintage form.

Dismissive of the often weak Halep serve, Williams swept through to the clash with Osaka.

"I definitely think this was the best match I've played this tournament for sure," Williams said. "I had to, going up against the number two in the world. I knew I had to do better and that's what I did, so I'm excited."

Looking forward to facing Osaka, Williams said in her on-court interview: "She's such a strong player on the court and such an inspirational person off the court, which I think is really cool. I've been watching her and I'm sure she's been watching me."

Aslan Karatsev's Cinderella story and historic run continued after sensationally reaching the Australian Open semi-finals as Grigor Dimitrov struggled dramatically with injury on Tuesday.

Former world number three Dimitrov won the opening set and was on track to move through in Melbourne, but he faded alarmingly due to a lower back problem.

Karatsev capitalised to oust his much-more fancied opponent – who was barely able to walk afterwards – 2-6 6-4 6-1 6-2 on Rod Laver Arena, the Russian qualifier and world number 114 becoming the first man in the Open Era to reach the semi-finals on his grand slam debut.

The unheralded 27-year-old also became just the second qualifier to advance to the Australian Open last four after Bob Giltinan in December 1977 as defending champion Novak Djokovic or Alexander Zverev await.

Dimitrov was aiming to reach his second Australian Open semi-final and the final four of a slam for the fourth time in his career, and the Bulgarian star started well.

After being broken in the third game, 18th seed Dimitrov put the set back on serve immediately as he took control of proceedings.

Dimitrov fired down four aces, won 82 per cent of his first serves, hit six winners and made just five unforced errors, while Karatsev's unforced-error count hit 19.

But just as Dimitrov – who had not dropped a set en route to the quarters – looked like the man to beat, he wilted in remarkable scenes as Karatsev won the second set to level the match.

Dimitrov's first-serve winners dipped to 69 per cent – his second serve extremely problematic – while his unforced errors grew to 15 in the second set – and Karatsev took advantage.

The third set was a write-off for Dimitrov, who headed to the locker room for medical treatment after Karatsev cruised to a two-sets-to-love lead.

There were remarkable scenes in the third set, Dimitrov virtually conceding as he was unable to keep up with Karatsev due to the injury.

Dimitrov, who only won 12 points in the third set as he was unable to keep up with Karatsev or generate any power on his serve, emerged for the fourth set but, while he tried to will himself on, it only delayed the inevitable in sad scenes.

Data Slam: Karatsev joins Russian club
Karatsev became the fourth Russian man to reach the Australian Open semis in the Open Era, after Aleksandar Metreveli  (1972),  Yevgeny  Kafelnikov  (1999-2000)  and  Marat  Safin  (2002, 2004-05). He is also the lowest-ranked man to reach the semi-finals of a major since Goran Ivanisevic (125) at Wimbledon in 2001.

WINNERS/UNFORCED ERRORS
Dimitrov – 21/34
Karatsev – 34/44

ACES/DOUBLE FAULTS
Dimitrov – 9/7
Karatsev – 9/6

BREAK POINTS WON
Dimitrov – 4/14
Karatsev – 8/11 

Former world number one Naomi Osaka is unfazed about her record at grand slams as she eyes consistency after reaching the Australian Open semi-finals.

Osaka will face either 23-time slam champion Serena Williams or Simona Halep in the semis following Tuesday's emphatic 6-2 6-2 win over Hsieh Su-wei in Melbourne.

Three-time major winner Osaka has gone on to win the title each time she has reached the quarter-finals of a slam – beating Hsieh en route to her 2019 Australian Open triumph.

Asked about the record, Osaka told reporters: "I don't really care about the stat. Just because I've only been to four quarter-finals.

"It feels something like 20. That would be cool. But four, it's not really doing too much for me.

"I would be more impressed if I didn't lose in finals. If it says 10-0 in finals. But the fact is if I don't reach the finals, I lose in the fourth round or the third round.

"For me, I'm happy to be more consistent. I think I'm being more consistent since New York, so that's the ultimate goal for me."

Osaka – in the midst of a 19-match winning streak – overpowered veteran Hsieh on Rod Laver Arena, where the Japanese star hit 24 winners and just 14 unforced errors, while she lost just two of her 25 first-service points.

It does not get any easier for Osaka, with record-chasing Williams or two-time slam champion Halep standing in the way of a trip to Saturday's decider at Melbourne Park.

"I played both of them before I think multiple times," Osaka – confident after saving two match points against Garbine Muguruza in the last 16 – said.

"Halep, I don't really like playing her. She's someone that's really tough, someone that gets the ball back every time. For me it's definitely a mental and physical battle.

"Of course, the same goes for Serena. She's Serena, someone that I feel really intimidated when I see her on the other side of the court."

Jordan Clarkson and Ben Simmons were drawn into a high-scoring shoot-out as the NBA-leading Utah Jazz powered past the Philadelphia 76ers 134-123 in a mouth-watering showdown.

In a battle pitting the Western Conference-leading Jazz against Eastern Conference pacesetters, the Jazz came out on top thanks to Clarkson's 40 points.

Utah's Clarkson nailed a stunning eight three-pointers as he became first player to come off the bench and score 40 points in less than 30 minutes since 1991.

In response, 76ers All-Star Simmons fired up for a career-high 42 points, 12 assists and nine rebounds, and Tobias Harris put up a 36-point, 10-rebound double-double, but the 76ers could not keep up with the Jazz.

Simmons opened with a career-best quarter of 19 points to give the 76ers a seven-point lead at the first buzzer before Utah took over and claimed an eighth straight win, and a 19th win in 20 games.

Missing Joel Embiid to a back injury, the 76ers' third straight loss opened the door for the Brooklyn Nets to close the gap in the east and they obliged, posting a franchise-record 25 three-pointers in a 132-121 win over the Sacramento Kings.

Kyrie Irving put up 40 points and former MVP James Harden added a triple-double (29 points, 14 assists and 13 rebounds) to lead the Nets to a third consecutive victory as the struggling Kings fell to a fourth straight defeat.

Former world number one and two-time grand slam champion Yevgeny Kafelnikov believes it is "inevitable" that a Russian player will claim major success as the country's male trio flourish at the Australian Open.

For the first time in the Open Era, three Russian men advanced to the quarter-finals of a slam thanks to star Daniil Medvedev, Andrey Rublev and qualifier Aslan Karatsev in Melbourne.

World number four Medvedev – the 2019 US Open runner-up – will face countryman Rublev in the Melbourne Park quarters as Karatsev meets Grigor Dimitrov for a spot in the semi-finals.

Not since Marat Safin at the 2005 Australian Open has a Russian male won a slam, but Kafelnikov is excited about the future.

"We all know that it's inevitable that they're going to win a slam," Kafelnikov, who was the first Russian man to earn a grand slam singles championship via the 1996 French Open before reigning supreme at Wimbledon three years later, told ATPTour.com.

"It's a question of when and where."

Kafelnikov added: "It was really expected that two of them got to where they are. The third one is a big surprise, but a very happy surprise. I'm very happy for Aslan, finally getting his breakthrough.

"He's going to play a lot of tournaments now without any pressure for the remainder of the 2021 season in terms of getting into the main draws and a big pay cheque will also be a huge boost for him. I'm really happy for him."

Kafelnikov, who won 26 singles titles, continued: "To be honest, I would be happy if one of those guys or even both of them surpass me in terms of number of titles and weeks at number one in the world.

"I'd be happy. I'm not going to be jealous about it. My career was very successful, and hopefully they will have even better [careers]."

Australian star Daniel Ricciardo vowed to "close the gap" in the race for Formula One championship glory and the new McLaren driver is refusing to make any excuses.

Ricciardo enters his 11th season in F1 having switched from Renault to McLaren, but the 31-year-old does not expect the transition to hold him back.

Since entering F1, Ricciardo has claimed seven grand prix victories and 31 podium finishes, while he earned fifth place in the drivers' championship during the coronavirus-hit 2020 season.

After moving to McLaren to replace new Ferrari driver Carlos Sainz Jr. and pair up with the returning Lando Norris, Ricciardo has an eye on climbing the ranks.

"What I expect out of myself in 2021 is to really hit the ground running," Ricciardo said.

"Naturally it does take some time to learn a new team, a new car, but I guess I'm going to be hard on myself, not to give myself too much time.

"I think with Renault I was the same. I really wanted to be there by Melbourne, that first race, but naturally it did take a bit of time.

"I don't want to be naive but I also want to make sure I'm just leaving no stone unturned and really by the end of year I've had a big contribution to the team, moving forward and closing the gap."