LeBron James' double-double fired the Los Angeles Lakers back to winning ways, while James Harden stepped up to rally the Kyrie Irving-less Brooklyn Nets past the high-flying Phoenix Suns.

James put up 30 points, 13 rebounds and seven assists as the reigning NBA champions leaned on their defense in the 112-104 victory over the last-placed Minnesota Timberwolves.

Without the injured Anthony Davis, Dennis Schroder played the supporting role for James, posting 24 points, while the Lakers battled to claim eight steals and seven blocks in a closely fought contest.

After taking a two-point lead into the fourth quarter at Target Center, the road side pulled away in the closing stages to improve to 22-7 in second place in the Western Conference.

Harden pulled out the stops with a double-double to lead the Nets to a sensational 128-124 comeback win against the Suns, despite playing without Irving after the star guard felt tightness in his lower back.

Nets coach Steve Nash revealed Irving received treatment at half-time of Brooklyn's win against the Sacramento Kings on Monday but expects the six-time All-Star to only be sidelined in the short term.

The Nets surged, scoring 40 fourth-quarter points to turn around a 24-point deficit, with Harden (38 points, 11 assists and seven rebounds) backed up by Joe Harris (22 points) as they halted the Suns' six-game winning streak.

Jokic burns Celtics but Nuggets fall short, Zion on target for Pelicans

Nikola Jokic lit up the Boston Celtics, scoring 43 points, but the Denver Nuggets could still not make triple-digits as their three-game winning stretch was ended in a 112-99 loss.

Zion Williamson shot an efficient 31 points, sinking 13 of his 16 field-goal efforts and going four-of-four from the free-throw line, as the New Orleans Pelicans snapped a three-match losing run with a 144-113 win over the Memphis Grizzlies.

Meanwhile, Damian Lillard’s 31-point, 10-assist double-double led the Portland Trail Blazers past the Oklahoma City Thunder in a 115-104 win, while centre Enes Kanter pulled down 21 rebounds.

Bazley struggles to take his chances

The Thunder never recovered against the Blazers after falling 34-21 behind in the first quarter and forward Darius Bazley was one player that could not find his range.

Bazley shot four from 16 from the field for 14 points during his 36 minutes on court, only dropping one his seven efforts from three-point range.

Giannis powers up but the Raps edge the Bucks

Giannis Antetokounmpo proved unplayable at times, scoring 34 points in the Milwaukee Bucks' 124-113 loss against the Toronto Raptors, as he ghosted past three defenders for one of his buckets.

Tuesday's results

Boston Celtics 112-99 Denver Nuggets
Portland Trail Blazers 115-104 Oklahoma City Thunder 
Los Angeles Lakers 112-104 Minnesota Timberwolves
New Orleans Pelicans 144-113 Memphis Grizzlies 
Toronto Raptors 124-113 Milwaukee Bucks 
Brooklyn Nets 128-124 Phoenix Suns

Jazz at Clippers

There has been no stopping the Utah Jazz, who have won eight straight and 19 of their past 20 games to establish a lead in the Western Conference, but a tough challenge awaits when they go on the road to face the third-placed Los Angeles Clippers on Wednesday.

Sofia Kenin revealed she had her appendix removed after being diagnosed with acute appendicitis following her shock Australian Open exit.

Australian Open champion in 2020, Kenin was dethroned in the opening week of the grand slam at Melbourne Park, where she was stunned by Kaia Kanepi in the second round last Thursday.

American star Kenin – who suffered her earliest major exit since Wimbledon in 2019 – revealed via social media on Wednesday that she had an operation in Melbourne.

"Hey guys! I want to share with you what happened to me a few days ago," Kenin said via Twitter.

"I went to the tournament physician office on Monday, February 15th with acute abdominal pain. I was evaluated by the tournament physician and referred to the hospital for further evaluation.

"Acute appendicitis was diagnosed following the completion of my CT scan. I had to have surgery and had my appendix removed on Monday, February 15, at Epworth Hospital Richmond. 

"I want to thank everyone at Epworth Hospital Richmond for taking good care of me!"

World number one Ash Barty refused to criticise Karolina Muchova's reasoning for a medical timeout after she was surprisingly beaten in the Australian Open quarter-finals.

Barty's bid to become the first Australian woman to win the Melbourne grand slam since 1978 came to a shock end on Wednesday, upstaged by 25th seed Muchova 1-6 6-3 6-2.

Winner of the 2019 French Open, Barty raced through the opening set in 24 minutes and led 2-1 in the second before Muchova requested an off-court medical timeout on Rod Laver Arena.

It was a turning point, Muchova returning reinvigorated as the unheralded Czech reached her maiden major semi-final in remarkable fashion, with the 24-year-old revealing during her on-court interview, "I was a bit lost [gestures at head] on the court and my head was spinning so I took a break. It helped me.

"It was more they just checked my pressure because I was a bit lost. I was spinning. So they cooled me down a bit with ice and it helped me."

Asked about Muchova's actions, Barty told reporters: "It's within the rules. She's within her rights to take that time. If she wasn't within the rules, the physios and the doctors would have said so. That's the laws of our game, is that we have those medical timeouts for cases that are needed. Obviously she needed that today. Completely within the rules for her to take that.

"From my point of view, I've played a lot of matches where there have been medical timeouts. I've taken medical timeouts myself before, so that shouldn't be a massive turning point in the match. I was disappointed that I let that become a turning point. I'm experienced enough now to be able to deal with that. It's a disappointment today without a doubt. But we learn and we move on."

Barty added: "I would have liked to have just been a little bit sharper the next game. Started well with the first point, just made a couple loose errors in that game. I think for the rest of the set, that was the story, it was just over and over-made. Probably pressed a little bit trying to be overly aggressive.

"Had some break points, I think it was that three-all, that was probably a bit of a critical game in the momentum there for the second set. Just disappointed with the fact that I wasn't able to bring the match back on my terms after she took that break."

"I didn't hear what she said when she called for the trainer," Barty continued. "That's not my decision. When you call for the trainer, you obviously tell the umpire what the reason is. And then the doctor and physios come out and assess it. That's within the rules. For me, that's not really my decision and not my concern what she took the medical for.

"Obviously there are rules when we go off the court for whatever areas you're getting treated because that's quite normal. But, yeah, that's not really my decision to make on whether or what her medical condition was or what the timeout was for."

Brady, who tallied 31 unforced errors in the final two sets having only managed six in the first, said: "It's heartbreaking, of course. But will it deter me, will it ruin the fact we've had a really successful start to our season? Absolutely not.

"The sun will come up tomorrow. We go about our work again. You're either winning or you're learning. I think today is a massive learning curve for me, for Tyz [coach Craig Tyzzer], my team as well. We take the positives out of it, without doubt and don't let this particular match, this particular hour of tennis deter us from what we're trying to do."

Boston Celtics star Jayson Tatum admitted he is still battling with the after-effects of coronavirus despite returning to NBA action three weeks ago.

Speaking ahead of Boston's 112-99 win over the Denver Nuggets on Tuesday, where Tatum contributed 21 points, six rebounds and eight assists, the All-Star revealed he was still experiencing respiratory issues during games.

Tatum tested positive for COVID-19 in early January, alongside some team-mates, forcing three Boston games to be postponed.

"I think it messes with your breathing a little bit," Tatum told reporters.

"I have experienced some games where, I don't want to say struggling to breathe, but you get fatigued a lot quicker than normal. Just running up and down the court a few times, it's easier to get out of breath or tired a lot faster; I've noticed that since I've had COVID.

"It's just something I'm working on. It's gotten better since the first game I played, but I still deal with it from time to time."

The Celtics have a 7-10 record since then, slipping to third in the Atlantic Division of the Eastern Conference, behind the Philadelphia 76ers and Brooklyn Nets.

After a period of quarantine, Tatum returned to the court with 24 points against the Chicago Bulls on January 25.

Tatum has not missed any of Boston's 12 matches since returning, top scoring for the Celtics on seven occasions, insisting the issues have not affected his performances or output.

"It's gotten better obviously from the first game I came back and played, but I guess it's just a long process," he said.

"I've talked to other guys that have had it and they say they experienced the same thing and it kind of just gets better over time. But as much as we play, I guess it takes a little bit longer.

"You've got to take it on the chin when things aren't going great and you're not playing how you should be."

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."