Kyrie Irving admitted it has been tough to watch the Brooklyn Nets from the sidelines as he marked his return to the practice court on Wednesday.

Irving returned to Nets' practice for the first time since preseason after the franchise decided in October to make him unavailable due to New York City's vaccine mandate and his unvaccinated status.

The Nets reversed that decision a fortnight ago when they announced the 29-year-old would return on a part-time basis for away games, despite remaining unvaccinated, with the side short on numbers following a surge of players in the NBA's health and safety protocols.

Irving's return to the practice court was delayed by him entering protocols a day after the Nets' announcement earlier this month, but he has now been cleared.

"I'm incredibly grateful just to be back in the building," Irving told reporters speaking for the first time publicly since mid-October. "Welcomed back with open arms [from] my teammates, the whole organisation.

"I'm not going to lie, it has been relatively tough to watch from the sidelines with everything going on in the world. I know everybody is feeling it. Just praying for everybody to be healthy during these times."

Irving will only be permitted to play away games and head coach Steve Nash said he would need a couple of weeks to get into NBA-ready condition.

"If I get the opportunity to get on the court and play with my teammates, even if it is just on the road for away games, I am grateful for the opportunity," Irving said.

"I've missed so much time. It's my first day back around the block with the guys and it felt like it's been a long time.

"It's only been, what, three months or so, but it has felt like the days have been slowly crossed off the calendar while I am sitting at home. When I thought about [returning to practice] last night, I could barely sleep.

"I understood their [the Nets'] decision and respected it. I really had to sit back and think and try not to become too emotionally attached to what they were deciding to do. I had to really evaluate things and see it from their perspective, meaning the organisation, my teammates.

"I really empathised, and I understood their choice to say if you are not going to be fully vaccinated, then you can't be a full [participant]."

The Nets are currently top of the Eastern Conference with a 23-9 record and play the Philadelphia 76ers at the Barclays Center on Thursday, which Irving will be unavailable for.

Five of the Nets' next six games are at home.

Ja Morant's 41 points overshadowed LeBron James as the Memphis Grizzlies won 104-99 to inflict a sixth defeat in seven games for the Los Angeles Lakers on Wednesday.

Morant was excellent for the Grizzlies, draining six of seven three-pointers in his 41-point haul along with 10 rebounds and two assists.

James, who turns 38 on Friday, tried his best for the slumping Lakers with 37 points, 13 rebounds and seven assists, while Russell Westbrook had another triple-double with 16 points, 10 rebounds and 12 assists.

But the four-time MVP came up short in the final 30 seconds, missing a three-point attempt to tie the game before an aimless pass turned the ball over.

Morant skilfully tipped in two to make it 102-97 with 1:15 to go and scored 25 of his 41 points in the second half.

Booker stars as Suns silence Thunder

Devin Booker landed six triples in his 38-point haul as the Phoenix Suns defeated the Oklahoma City Thunder 115-97 to improve to a 27-7, putting them joint-top with the Golden State Warriors. Along with his 38 points, Booker also had seven rebounds and five assists.

The Chicago Bulls had a full team performance in their 131-117 victory over the Atlanta Hawks, with contributions from Zach LaVine (25 points), Coby White (17 points, 12 assists), Nikola Vucevic (16 points, 20 rebounds) and DeMar DeRozan (20 points, eight assists).

Rudy Gobert starred with 22 points and 14 rebounds as the Utah Jazz recorded their eighth straight road win, beating the depleted Portland Trail Blazers 120-105 despite Damian Lillard's 32 points.

Brown struggles from beyond the arc

Jaylen Brown has been in top form lately but hit one of 13 from beyond the arc as the Boston Celtics went down 91-82 to the Los Angeles Clippers.

The Cleveland Cavaliers have been dealt a major blow after it was confirmed Ricky Rubio will miss the rest of the 2021-22 season.

Rubio buckled as he planted in the lane during the fourth quarter of Tuesday's road game at the New Orleans Pelicans.

The 31-year-old, who has played a big role in the Cavaliers' strong start to the season in his first year with the team, clutched his left knee and was in clear distress. He had to be helped to his feet and to the locker room for further assessment.

Rubio was unable to put any weight on his left leg and further tests on Wednesday revealed the guard had torn his anterior cruciate ligament, ending his campaign early. 

With Darius Garland having entered the NBA's Health and Safety Protocols, Rubio started at point against the Pelicans and had 27 points while adding 13 rebounds and nine assists in what was a 104-108 defeat for Cleveland.

Rubio had enjoyed a fine start to life with the Cavs, having averaged a joint career-high 13.1 points per game through 34 appearances since his arrival from the Minnesota Timberwolves.

The Cavs sit fifth in the Eastern Conference, with a 20-14 record.

NHL players who test positive for coronavirus and are fully vaccinated may only have to isolate for five days as part of changes to the league's health protocols.

Previously, any player or staff member to record a positive test would have to isolate for 10 days.

Outbreaks among teams this month caused the league to begin its Christmas break early and pause all games that involved cross-border travel between the United States and Canada.

However, following updated guidance from the USA's Centers for Disease Control and Prevention, the NHL and the National Hockey League Players' Association (NHLPA) agreed to modify regulations.

Players and team operations staff who test positive will now only have to isolate for five days, or, if they develop a fever, "until their fever resolves".

Asymptomatic individuals or those with improving symptoms will be cleared to return to practice and games if they provide a test that is either negative or falls within certain parameters.

They will also require medical clearance from team doctors and the permission of their local health authority. They must also wear a mask around others for another five days, except for during practice and games.

NHL medical experts will review the changes to the measures on or before January 12.

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

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

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

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

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

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

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

Stephen Curry has not quite got to grips with the fact every three he hits will be a new record, having reached 3,000 triples on a night where the Golden State Warriors failed to handle the Denver Nuggets.

Curry broke Ray Allen's all-time record this month and on Tuesday became the first man to 3,000, though he could not inspire the Warriors to victory.

Minus Draymond Green, the Warriors' best defender and Curry's chief facilitator, Golden State slumped to a 60-36 half-time deficit.

They clawed that back to trail by just three points in the closing stages of the fourth quarter, Curry getting to the 3,000 mark with a three-pointer in the third quarter.

But they could not avoid an 89-86 loss, falling to only their seventh defeat of the season.

Asked about his latest slice of NBA history, Curry told a post-game media conference: "It was cool to reach that milestone, it's a pretty awesome accomplishment in terms of it hadn't been done in NBA history.

"It's kind of a weird thought to think that in the rest of my career I'm pretty sure every three I make will be a new record. I'm just going to enjoy it."

Curry is not setting a target number he would like to reach at the end of his remarkable career.

"You don't really put limits on what can happen," he added. "You just hoop and enjoy yourself and see what happens when it's all said and done."

The Warriors still lead the Western Conference despite the defeat, with Curry encouraged by their second-half resilience.

"It all kind of went wrong during the first half, but I love the way we fought," he said.

"Pretty sure we're not a moral victory team but 29 other teams probably would have laid down and died with that type of first-half performance, but we gave ourselves a chance to tie the game with a minute and a half left. Pretty impressive."

Four-time NBA MVP LeBron James has brushed off retirement talk after recording a triple-double to help end the Los Angeles Lakers' five-game skid on Wednesday.

The Lakers overcame the Houston Rockets 132-123 with James finishing with 32 points, 11 rebounds and 11 assists with one steal and two blocks while Russell Westbrook added 24 points, 12 rebounds and 10 assists.

The Lakers have struggled without center Anthony Davis who succumbed to an MCL sprain in the first of their five straight defeats, when they went down 110-92 to the Minnesota Timberwolves.

James, who turns 37 on Thursday, had been unable to arrest the Lakers' slide in Davis' absence but would not be draw on retirement plans.

"I know I'm on the other side of the hill compared to the hill I was on before," James said at the post-game news conference.

"I've thought about it, where I'm at and whether I'm still playing at such a high level. I've done 19 [seasons] and I'm not gonna do another 19.

"We'll see where my body takes me and my mind takes me. As long as my mind is fresh and my body stays with that, I can play the game.

"I've put in enough hours and punched enough clocks to know when that time comes I'll be OK with it."

The Lakers had endured a frustrating stretch falling below .500, having not won since December 15 when they got past the Dallas Mavericks 107-104 in over-time until breaking that against the Rockets.

"This is the pros," James told reporters after the win over the Rockets. "The hardest thing in this league is to win.

"At any level, any pro, NBA, NFL, NHL, MLB, WNBA, the hardest thing to do is to win. It doesn’t matter who you're playing against or who's on the floor, everyone was drafted or signed to this level for a reason.

"Any time you can get a win in this league you don’t take it for granted."

Reigning MVP Nikola Jokic led the Denver Nuggets with a double-double as they withstood the Golden State Warriors' second-half charge to win 89-86 on Tuesday.

MVP contender Stephen Curry only managed two first-half points as the Warriors produced arguably their worst half of the season before storming back in the second half to tie the game in the fourth quarter.

Jokic, who had 22 points, 18 rebounds and five assists, made a key defensive stop on rookie Jonathan Kuminga after his own turnover at 88-86 before Andre Igoudala missed a three-point attempt on the buzzer to force over-time.

Curry's output increased dramatically in the second half to finish with 23 points including five triples, as the Warriors reeled in the Nuggets after trailing by 24 points. The Warriors' two-time MVP had six turnovers for the game.

However, Curry also reached another milestone with his 3,000 career three-point attempt made, marking 157 straight games with a triple.

Andrew Wiggins scored 21 points with eight rebounds with the Warriors without Draymond Green who entered COVID-19 protocols this week. The result means the ladder-leading Warriors fall to 27-7 while the Nuggets improve above .500 to 17-16.

LeBron and Russ end Lakers' skid

LeBron James and Russell Westbrook both recorded triple-doubles as the Los Angeles Lakers ended their five-game skid with a 132-123 victory over the Houston Rockets. James had 32 points, 11 rebounds and 11 assists while Westbrook added 24 points, 12 rebounds and 10 assists.

Giannis Antetokounmpo scored 28 points with six rebounds and six assists in his second game since returning from COVID-19 protocols while Bobby Portis nailed five three-pointers in his 19-point haul as the Milwaukee Bucks defeated the Orlando Magic 127-110.

Joel Embiid had 36 points with 11 rebounds while Tobias Harris (19 points, 12 rebounds, 10 assists) recorded a rare triple-double as the Philadelphia 76ers knocked off the Toronto Raptors 114-109.

Randle loses handle in offense

Last season's Most Improved Player Julius Randle continues to struggle to re-discover his offensive games, shooting five of 20 from the field and having only two assists in the New York Knicks' 96-88 win over the Minnesota Timberwolves.

The Brooklyn Nets can count on Kevin Durant and LaMarcus Aldridge again after they were cleared to return from NBA health and safety protocols.

Durant, who was in a rich vein of form, has sat out the Nets' previous three games, while Aldridge has not featured in the past five.

They could be back on court for Thursday's game against the Philadelphia 76ers at Barclays Center, the first of a run of three at home for the Nets.

Kyrie Irving has also been released from the shackles of the same COVID-19 protocols, the NBA said on its official website.

Because Irving is unvaccinated and cannot play home games due to local restrictions in New York City, his return to action must wait.

Irving has not played all season but could be in the frame to be involved in the trip to the Indiana Pacers on January 5 or at the Chicago Bulls a week later.

The Nets lead the way in the Eastern Conference with a 23-9 record, after following up a Christmas Day win over the Los Angeles Lakers by beating the Clippers on Monday.

James Harden, freshly out of protocols, played lead roles in both those wins with hauls of 36 and 39 points, and now he is set to have elite support.

Durant leads the Nets in scoring this season with an average of 29.7 points per game, alongside 7.9 rebounds and 5.9 assists. 

The Nets have had three recent games postponed due to their roster being hard hit by absentees.

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

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

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

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

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

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

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

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

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

Steve Nash praised a "historically great" James Harden after he joined an exclusive club with his instrumental performance for the Brooklyn Nets against the Los Angeles Clippers.

Harden, having racked up 36 points in his first game since exiting the NBA's health and safety protocols in the Nets' Christmas Day win over the Los Angeles Lakers, backed that effort up with a 39-point display versus the Clippers, which also saw him register 15 assists and eight rebounds.

His showing in the 124-108 triumph saw Harden become the 10th player in NBA history with 20,000 points, 6,000 assists and 5,000 rebounds. 

Also in that club are Kobe Bryant, Clyde Drexler, John Havlicek, LeBron James, Chris Paul, Gary Payton, Oscar Robertson, Jerry West and Russell Westbrook.

And Nash said of the 2018 MVP: "He's historically great. The numbers he's put up are incredible.

"He's one of the best players of his generation and it's mind-boggling to think of all the numbers he's put up and all the success he's had.

"He's one of those very, very special players not only of his generation but historically. The numbers back it up."

On his spectacular return following his time in the protocol, Nash added: "You're expecting guys to feel their way back into it. But from the jump against the Lakers, again [v the Clippers], he's just been clinical.

"Just such a great head of the snake for us. When he plays like that we are very difficult to beat."

Asked if he felt he benefited from his two-week lay-off, Harden replied: "Probably. I was starting to feel good right before then…That break, Covid, or protocol, or rest, whatever you want to call it, it could've went two ways.

"I just locked in on my body, my eating, and when I was able to start working out, my workouts. I felt good. My body felt good.

"I'm trying to make sure my body feels great so I can continue to keep going up in the regular season and preparing for the playoffs. 

"Individually I have to make sure I'm in the best shape and I'm the best James that I can be for my team-mates.

"If I'm in that form, good things will happen for my team."

James Harden scored 39 points in his second game since coming out of the NBA's COVID-19 protocols to inspire the Brooklyn Nets past the Los Angeles Clippers 124-108.

Harden returned with 36 points and a triple-double in the Nets' 122-155 win over the Los Angeles Lakers on Christmas Day and backed that up against the depleted Clippers, who were without star duo Paul George (elbow) and Kawhi Leonard (ACL).

The 2018 NBA MVP was in a dominant mood, with Kevin Durant absent in protocols, shooting 15 of 25 from the field and providing 15 assists, as well as having eight rebounds and two steals.

Patty Mills and Nicolas Claxton both contributed 18 points for the Nets, while the latter had three blocks. Marcus Morris Sr was the Clippers' best with 24 points, five rebounds and six assists.

Bulls duo combine for Hawks defeat

Trae Young returned from COVID protocols with 29 points and nine assists but it was not enough as the Atlanta Hawks lost 130-118 to the Chicago Bulls who had Zach LaVine (30 points, four rebounds, nine assists) and DeMar DeRozan (35 points, five rebounds, 10 assists) impress. LaVine and DeRozan became the first team-mates each with 20 points and five assists in a half over the last 25 seasons.

Ja Morant drained a last-gasp clutch shot to earn the Memphis Grizzlies a thrilling 114-113 win over the Phoenix Suns, who were missing center Deandre Ayton and head coach Monty Williams after entering protocols. Desmond Bane had a career-high 32 points and Morant finished with 33, grabbing the win after Devin Booker (30 points) had put the Suns ahead with five seconds left with a three-pointer.

The Utah Jazz extended their win streak to four games, even without injured Donovan Mitchell, as they defeated the San Antonio Spurs 110-104 with Jordan Clarkson (23 points, eight rebounds, five assists) starring off the bench.

In-form Celtic misses the mark

Jaylen Brown has been in hot point-scoring form lately but his shooting was down at 33.3 percent as the Boston Celtics – without Jayson Tatum who has entered COVID protocols - lost 108-103 to the Minnesota Timberwolves. Brown scored 26 points but made only two of eight from beyond the arc.

Los Angeles Lakers recruit Russell Westbrook says he is sick and tired of the constant commentary on his performances for his new franchise this season.

Westbrook joined the Lakers in a major off-season move from the Washington Wizards, linking up with four-time MVP LeBron James and All-Star Anthony Davis as the 2020 NBA champions bid for another title tilt.

But the Lakers have struggled with a 16-18 record this season, including five straight defeats with Westbrook often copping the blame.

"Everybody wants me to do this but then they don't want me to do this," Westbrook said on a virtual news conference on Monday. "Honestly, I'm over the whole situation with what everyone else wants me to do and what they think I should be doing."

Westbrook has averaged 19.6 points per game this season, which is his lowest return since his second season in the NBA back in 2009-10.

The 33-year-old point guard has also averaged 7.9 rebounds and 8.1 assists per game this season, down on last season's career-best 11.5 rebounds and league-high 11.7 assists with the Wizards.

Westbrook also last season broke Oscar Robertson's record for the most triple-doubles in NBA history but has only managed six this season in 34 games.

"Honestly, I think I've been fine," Westbrook said. "The conversation has been heavily on how I'm playing and what I'm doing, but I think people are expecting me to have f---ing 25, 15 and 15, which, that is not normal.

"Everybody has to understand, like, that's not a normal thing that people do consistently."

He added: "People are saying 'let Russ be Russ,' I think nobody understands what that means. "I think people just say it - 'let Russ be Russ' - but nobody actually knows what that means but myself.

"I'm gonna lean on that and make sure I do what I'm supposed to do. And let everything else outside the locker room, whatever that may be, take care of itself."