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.

England coach Chris Silverwood will miss the fourth Ashes Test after a family member of the touring party tested positive for coronavirus.

Silverwood's position has come under question after England's dismal form in Australia, with the hosts having already retained the urn by racing into a 3-0 series lead.

Defeats in Brisbane and Adelaide were followed by a capitulation in Melbourne this week, with the third Test not even lasting three days.

Silverwood will be unable to be in attendance for the fourth match of the Tour in Sydney, as England desperately search for a result in order to avoid a whitewash.

A family member who travelled to Australia has tested positive for COVID-19 in the latest round of PCR tests administered to the touring party, the England and Wales Cricket Board (ECB) confirmed.

Silverwood will therefore have to isolate for 10 days, along with his family, in Melbourne. Another round of PCR tests will take place on Thursday.

The fourth Test is due to start at Sydney Cricket Ground on January 5, with the series finishing in Hobart after coronavirus regulations in Western Australia meant Perth was unable to host the final match.

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.

Borussia Monchengladbach have confirmed Denis Zakaria will leave the club at the end of the season.

The announcement comes less than 24 hours after Germany international Matthias Ginter revealed on Instagram that he will be letting his contract expire in 2022.

Switzerland international Zakaria has been with the club since joining from Young Boys in 2017 and has largely been a regular throughout his time with Die Fohlen.

The 25-year-old defensive midfielder, who can also play at centre-back, has been linked with several of the world's biggest clubs, such as fellow Bundesliga side Bayern Munich, Liverpool, Barcelona and Juventus.

While no club has yet emerged as the favourite to land Zakaria, he has at least provided clarity to Gladbach as he prepares to enter the final six months of his contract.

A statement on Gladbach's website read: "Denis Zakaria… has informed Borussia that he would like to leave the club after five years in the summer."

Sporting director Max Eberl expressed his satisfaction with having matters resolved ahead of the second half of the season, with Gladbach languishing just two points above the bottom three at the halfway stage.

"I told the boys in no uncertain terms that I would like everything that has nothing to do with Borussia and the second half of the season to be clarified by the end of this year," Eberl said.

"I want everyone to focus on the club, the second half of the season and this situation. The players should use the next few days to clarify their concerns left and right, and we will also make a few decisions so that we can start preparing for the second half of the season cleanly and clearly."

Like Ginter, Zakaria will be able to begin negotiating with other clubs once he enters the final six months of his contract – which expires on June 30 – later this week.

Whoever lands Zakaria will be adding a potentially formidable option to their midfield.

Nominally a defensive midfielder, Zakaria sees plenty of the ball and is good with his distribution: he averages 52.3 passes every 90 minutes and 47.1 successful ones, the latter being the ninth-most this season among Bundesliga midfielders with at least 500 minutes played.

He is just as comfortable carrying the ball, however.

Among the same group of players, only seven average more than his two successful dribbles every 90 minutes – all of those are more attack-minded players, such as Jamal Musiala, Christopher Nkunku, Jude Bellingham and Florian Wirtz.

When compared only with players who generally occupy central or defensive midfield roles, Zakaria comes out on top for total carries (208), and is well clear in terms of carry distance, his 2,407.3 metres being 400 metres more than anyone else.

He has also progressed the ball further up the pitch (1,227m) than any other comparable player, with Suat Serdar the only other similar midfielder to surpass 1,000m, highlighting his importance to getting Gladbach on the front foot.

While Zakaria is helped in these metrics by the fact he has played at centre-back this season, that does only account for a short amount of time in the grand scheme.

Gladbach are having a poor season, but Zakaria is managing to show his strengths.

Thibaut Courtois has confirmed he is asymptomatic after returning a positive test result for COVID-19.

The Real Madrid goalkeeper, along with team-mates Eduardo Camavinga, Federico Valverde and Vinicius Junior, was confirmed by Los Blancos to have tested positive in the latest round of testing.

LaLiga leaders Madrid have had to deal with several positive cases within their squad over recent weeks, and are likely to be without the four players for at least their opening matches of 2022, against Getafe and Alcoyano respectively.

While Valverde and Camavinga have made 15 LaLiga starts between them this season, goalkeeper Courtois has started every top-flight match and winger Vinicius has played in all 19 league fixtures, scoring 10 goals and providing four assists.

His 14 goal contributions in LaLiga is topped only by Karim Benzema (22) in Madrid's squad, and the Brazil international could be a big miss for Carlo Ancelotti, while Courtois' steady presence will also be absent.

"Unfortunately, and despite complying with all the measures, I have tested positive for COVID," wrote the Belgium goalkeeper on Twitter.

"Although I do not have any symptoms, I am at home following the corresponding protocol and training to return as soon as possible. Thank you all!"

SAFE HANDS

Courtois has played every minute for Madrid in all competitions so far in 2021-22, with back-up Andriy Lunin yet to make a single LaLiga appearance for Los Blancos across the last two seasons.

The Ukrainian was one of six Madrid players to test positive for COVID-19 last week, though should be in line to return from isolation in time to face Getafe on January 2.

Only Leicester City's Kasper Schmeichel (26) has made more appearances of goalkeepers in Europe's top five leagues than Courtois (25) this campaign.

Of shot-stoppers to play at least 20 times, only Yassine Bounou (Sevilla) and Edouard Mendy (Chelsea) – both 15 – have conceded fewer goals than Courtois' tally of 19.

In LaLiga, Courtois concedes 0.84 goals per 90 minutes played, ranking him third out of goalkeepers to have featured at least 10 times in Spain's top flight this season.

Courtois' save percentage of 78.41, meanwhile, leads the way in Europe's top five leagues, out of goalkeepers to have played 20 games or more across all competitions, ahead of Mendy (77.61), and the former Chelsea man has made only one error leading to a shot, with that mistake not resulting in a goal.

Thibaut Courtois, Eduardo Camavinga, Federico Valverde and Vinicius Junior have all tested positive for COVID-19, Real Madrid have confirmed.

LaLiga leaders Madrid have had to deal with several positive cases within their squad over recent weeks, and are likely to be without another four players for at least their two opening matches of 2022.

Madrid issued a short statement on Wednesday confirming Courtois, Camavinga, Valverde and Vinicius were the latest players to test positive.

Los Blancos face Getafe in LaLiga on January 2, before travelling to Alcoyano in the Copa del Rey three days later.

David Alaba and Isco were confirmed to have tested positive for coronavirus on December 21, taking the total of Madrid players to have contracted the illness to eight in the space of a week.

Luka Modric and Marcelo had gone into quarantine after routine testing on December 15, and Gareth Bale, Marco Asensio, Rodrygo and Andriy Lunin then tested positive the following day, along with Carlo Ancelotti's son and technical assistant Davide.

While Valverde and Camavinga have made 15 LaLiga starts between them this season, goalkeeper Courtois has started every top-flight match and winger Vinicius has played in all 19 league fixtures, scoring 10 goals and providing four assists.

His 14 goal contributions in LaLiga is topped only by Karim Benzema (22) in Madrid's squad, and the Brazil international could be a big miss for Ancelotti.

Madrid will be hoping to welcome back the players in time for their home match against Valencia on January 8.

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.

Chris Woakes has given his support to Joe Root amid growing calls for England's star batsman to step down as captain following a chastening Ashes defeat in Australia.

The hosts took an unassailable 3-0 lead in the series after winning by an innings and 14 runs in the third Test at the MCG on Tuesday, skittling England for just 68 in their second innings, after which Root said it was "too soon to look at things."

The 30-year-old has been England's Test captain since 2017 after taking over from Sir Alastair Cook, and will lead his side out for a record 60th time in the fourth Test in Sydney, overtaking Cook's previous record of 59.

Speaking to BBC Sport, Woakes expressed his backing for Root, saying: "Joe is a great cricketer with a great cricket brain. Hopefully he can continue [as captain].

"We haven't been able to bat well around him. You'd expect us to probably put in a lot stronger performances than we have.

"I'm sure Joe will have many more years like he's already had and hopefully we can bat better around him."

England have averaged just 187.5 with the bat in six innings, failing to score more than 300 in any of the first three Tests down under.

Root has scored 1,708 runs in 2021, which equates to 26 per cent of his team's overall total, the highest proportion of any player for their respective team in Test cricket.

When asked if Root still has the backing of the team, Woakes said: "Absolutely."

The Warwickshire all-rounder was left out of the team for the third Test having taken a combined 3-228 with the ball in the first two Tests, although his batting average of 26.25 is England's third highest of the series behind only Root (42.16) and Dawid Malan (33.66).

The future of Chris Silverwood has also been called into question with the former England bowler winning just one of his last 12 Tests as coach.

"It's hard for us to focus on people," Woakes added when asked about Silverwood's position. "Who am I to talk about people's futures other than my own?"

Barcelona have confirmed Ousmane Dembele, Samuel Umtiti and Gavi have tested positive for COVID-19.

The Blaugrana were previously hit with positives for Clement Lenglet, Dani Alves, Jordi Alba and Alejandro Balde in the past week.

A statement on the club's website on Wednesday read: "The footballers Dembele, Umtiti and Gavi are positive for COVID-19 after PCR tests on the squad. 

"The players are in good health and self-isolating at home. The club has reported the cases to the relevant authorities."

Umtiti has largely been out of favour at Camp Nou this season, playing just once across all competitions, while Dembele has only managed eight appearances (four starts) having spent a significant period out through injury.

Gavi is the club's third-highest appearance maker in this campaign, though, with the 17-year-old midfielder playing 22 times, 17 of which have been starts. Only Sergio Busquets has featured more often.

The Blaugrana sit in seventh place in LaLiga, two points off fourth and 18 behind leaders Real Madrid, and travel to face Real Mallorca next on January 2.

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."