The short-handed Brooklyn Nets slumped to their 13th defeat from their past 15 games as Jayson Tatum led the Boston Celtics to a 129-106 victory on Thursday.

Tatum scored 30 points including four three-pointers along with seven rebounds and four assists for the Celtics who have won 10 of their past 11 games.

The Celtics' hot form is in contrast to the Nets, who have slumped to a 31-29 record in the absence of the injured Kevin Durant, unavailable Kyrie Irving and unfit Ben Simmons.

Boston led from start to finish, opening up a 35-22 quarter-time lead, with good support from big men Robert Williams III (12 points and 11 rebounds) and Al Horford (11 points and 13 rebounds).

Seth Curry top scored for the Nets with 22 points but only made two-of-seven from beyond the arc, while Patty Mills struggled with one point from 28 minutes, shooting none-of-nine from the field.

Morant hurt in tight loss

Ja Morant airballed a game-tying three-point attempt in the dying seconds and had a third-quarter injury scare as the Memphis Grizzlies lost 119-114 to the Minnesota Timberwolves. Morant finished with 20 points and eight rebounds but seemed to pick up a leg injury on a drive which impacted his final quarter. D'Angelo Russell scored 23 of his 37 points in the fourth quarter for the Timberwolves.

The ladder-leading Phoenix Suns had no issues without Chris Paul as they extended their winning streak to eight games with a 124-104 victory over the Oklahoma City Thunder. Devin Booker scored 25 points with five rebounds, 12 assists and a career-high six steals.

Stephen Curry was benched late after 18 points and 14 assists as the Golden State Warriors won 132-95 over the Portland Trail Blazers, while Nikola Jokic had 25 points, 12 rebounds and nine assists in the Denver Nuggets' 128-110 triumph over the Sacramento Kings.

Trae wayward in Hawks loss

Trae Young struggled as the Atlanta Hawks went down 112-108 to the Chicago Bulls. The Hawks guard made three-of-17 from the field in his 14 points for the game. For the Bulls, who have won six in a row, in-form DeMar DeRozan scored 37 points while Zach LaVine returned from injury with 20 points.

Former US Open champion Sloane Stephens progressed into the quarter-finals at the WTA Abierto Zapopan in Guadalajara after a hard-fought win over Chloe Paquet on Thursday.

Stephens won in straight sets but it took almost two hours, triumphing 7-5 6-4 over the Frenchwoman ranked just outside the top 100.

The 28-year-old American was dominant on her first serve, while she broke her opponent five times throughout the match.

Stephens, who is the sixth seed, will play Daria Saville in the last eight after the Australian eased past qualifier Caroline Dolehide 6-1 6-3 in one hour and seven minutes.

Third seed and defending champion Sara Sorribes Tormo made light work of Poland's Magdalena Frech 6-0 6-2 to set up a quarter-final meeting with Marie Bouzkova.

Colombian fourth seed Camila Osorio needed just over two hours to get past Hailey Baptiste 1-6 6-3 6-3, fighting back after a lopsided first set.

Brooklyn Nets head coach Steve Nash concedes his side must have urgency to arrest their slide after Thursday's 129-106 loss to the Boston Celtics left them with a 31-29 record.

The Nets were billed as title contenders earlier this season but have endured a tough midseason period, winning only two of their past 15 games with Kevin Durant out injured, Kyrie Irving unavailable for home games and James Harden traded out.

Harden swapped places with Ben Simmons from the Philadelphia 76ers, with the new acquisition still yet to debut as he re-conditions having not played this season.

Nash admitted having a healthy roster would go a long way to fixing his side's issues but conceded they needed urgency as their season slips away.

"We understand the situation we're in. We know there's urgency," Nash said at the post-game news conference.

"We're not going to have half a season to figure this thing out. We're up against the clock.

"Our guys have been great. There's a lot of pressure and circumstances that make it difficult as you're dropping in the standings but their spirit has been outstanding.

"That's the spirit of taking it day-by-day game-by-game trying to improve. At the same time, we recognise the situation we're in."

Jayson Tatum starred for the in-form Celtics with 30 points and seven rebounds, while the Nets' best were Seth Curry (22 points and seven rebounds), Bruce Brown Jr (15 points, seven rebounds and five assists) and Kessler Edwards (13 points and five rebounds) off the bench.

Nash was pressed on ways to fix their struggles without their key players, with no timeframes on Durant and Simmons' availability but he reverted to a healthy roster.

"That's number one, two, three and four really," Nash said. "We could've played better tonight, but we can play better on nights when we have everybody too.

"In this league, you flip it, take four of the Celtics starters out, it's a different look."

Kurt Kitayama managed four straight birdies on his back nine to claim the lead ahead of Daniel Berger in a group of three after the opening day of the Honda Classic in Florida on Thursday.

The little-known American carded a six-under-round of 64, starting the day with three straight birdies, before his hot run on his back nine at Palm Beach Gardens.

Kitayama has enjoyed a good recent period, making the cut at his past five starts before Thursday's impressive feat as solo leader.

"I think when you're struggling, I think just that self-motivation to find keep getting better and finding a way to figure it out, it's kind of how you've got to keep going," Kitayama told reporters.

The 29-year-old leads by one stroke from Rory Sabbatini, Chris Kirk and hometown hero Berger who are five-under.

World number 20 Berger started his round brilliantly, with three birdies on his first four holes, while he also sunk a 28-foot birdie putt on the ninth hole with no ill-effects from a back problem that has been plaguing him lately.

Slovakian veteran Sabbatini made birdie on the 18th to jump into a share of second, with Kirk having eight birdies and three bogeys in an entertaining round.

Danny Willett, Matthias Schwab, Andrew Kozan, Aaron Rai and Peter Uihlein are all next tied for fifth at three under.

Four-time major winner and current world number 15 Brooks Koepka managed three birdies in his round of two-under-68 to be four shots off the pace.

Last week's Genesis Invitational winner Joaquin Niemann had an even round of 70, despite leading early after four birdies on his front nine, with a double bogey holding him up on the fourth hole.

Pre-tournament favourite Louis Oosthuizen will battle to make the cut after five bogeys on the front nine before a double bogey on the 17th hole left him with a five-over-75.

England will be without Manu Tuilagi for their Six Nations clash with Wales after the centre suffered a hamstring injury.

Tuilagi had been set to return from an injury lay off to feature at Twickenham on Saturday, having been named in the team that Eddie Jones confirmed on Thursday.

However, England have been dealt a blow as scans after training revealed a hamstring problem for the 30-year-old.

England have recalled Joe Marchant, who will train with the squad on Friday. However, an updated team will not be confirmed until the day of the game.

Tuilagi had been set to play alongside Henry Slade in midfield for Jones' team, who bounced back from their defeat to Scotland in the opening match by beating Italy last time out.

He has represented England in 46 Tests so far since making his debut in 2011.

Novak Djokovic has not lost any motivation for tennis, but believes he needs time to find some rhythm after a long break, as he conceded the world number one spot.

Djokovic's 86-week reign at the top of the ATP rankings will end on Monday, after the Serbian lost to qualifier Jiri Vesely 6-4 7-6 (7-4) in the Dubai Tennis Championships.

That means that Daniil Medvedev will leapfrog Djokovic regardless of whether or not he wins in Acapulco.

Using his official Twitter account, Djokovic congratulated both Vesely – who won his only previous meeting with the 20-time grand slam champion back in 2016 – and Medvedev.

"Well played @jiri_vesely, that was a great game. Wish you the best of luck for the rest of the tournament," Djokovic wrote, accompanying his post with a thumbs up emoji.

"Congratulations also to a very deserving @DaniilMedwed, who will now become world number one."

His appearance in Dubai was Djokovic's first competitive action of 2022, after he was unable to feature at the Australian Open due to his refusal to be vaccinated against COVID-19.

While suggesting he is still working his way back to full sharpness after not playing since December, Djokovic insisted he is fully motivated to carry on playing.

"My goal is to keep on playing tennis," Djokovic said in his post-match news conference.

"That's the ultimate goal. For as long as I really feel like it and as long as I can play. As long as my body allows me, as long as the circumstances in my life as well, the people that surround me [and] support me.

"I'm still motivated and I'm still p***** off when I lose a match. I care about it. I care about winning every match, as anybody else on the Tour, regardless of the age. I'm actually glad that I'm feeling a lot of emotions every single day because it means that I really want to be part of this sport, part of the Tour.

"Unfortunately, [it] wasn't my day. I congratulate Jiri. He played better. 

"The more matches I play, the more comfortable I get on the court. I need the match play. I didn't have many matches at all last few months.

"I don't look at the age really as a restricting factor for my career. I still feel great in terms of my body and the way it's holding on, the way it's recovering. It's been serving me well, so to say. That's something that obviously encourages me to keep going."

Seth Curry does not want an apology from Ben Simmons as the pair start a new chapter with the Brooklyn Nets.

Curry and Simmons were team-mates on the Philadelphia 76ers, although the former first overall pick had not played this season.

Simmons has now cited a difficult period with his mental health as his reason for staying away from the 76ers until a trade was agreed with the Nets.

The Australian was the subject of intense criticism following the team's playoff defeat to the Atlanta Hawks last season, in which he was deemed to have shirked responsibility and passed up shooting opportunities.

With James Harden leaving the Nets for the 76ers, Curry and Andre Drummond joined Simmons in the deal going the other way.

It means Simmons must now play with team-mates he abandoned earlier in the season, but Curry does not see that as a problem.

"Business is business," Curry told ESPN on Thursday ahead of the NBA's resumption after the All-Star break.

"I said from day [one], even when he was out early in the season, people were asking me if I feel like, if Ben comes back, should he apologise to us or whatever?

"I understand the business; he doesn't need to apologise to anybody. When he's on the court, I know he's going to do his job and he's going to do what he does. So I understand the business.

"He was doing what he felt was best for himself business-wise and personal-wise. And the team's going to do the same thing as far as making trades or whatever, so I understand it, I've been around it; I don't take anything personal.

"When we're on the court, we're team-mates. Everything's fine, and we depend on each other to do good things. There's been nothing negative he's done to me personally, so I'm fine."

Anett Kontaveit remained on course for a sixth title in seven months, progressing to the Qatar Open semi-finals after defeating Ons Jabeur in straight sets.

Champion in St Petersburg two weeks ago, Kontaveit extended her winning run to eight matches following a 6-4 6-1 success.

The opening set was neck and neck until Kontaveit won 15 out of 16 points from 30-30 at 4-4 to draw first blood and establish a 2-0 lead in the second.

The Estonian, who registered just 12 unforced errors throughout the contest, then took 12 of the last 15 points to advance to the last four. 

"At times, it was just kind of fun because I felt like the level was really good, and I was playing really well," said Kontaveit, who has won nine of her last 13 matches against top-10 opposition.

"I think I have this confidence that I can go deep every week that I'm playing, and I'm not setting these mental barriers to myself that I used to do. 

"I'm very happy with being in the semi-finals, but I also feel like I can still go deeper, I can still do more. So, I'm not too satisfied yet with this result. I feel like if I play well or if I'm consistent, I have a chance with anyone.

"I'm really happy that I'm bringing a good level of tennis consistently every tournament. I think that's something that I'm just most pleased with."

In the semi-finals, Kontaveit will face another in-form player in Jelena Ostapenko, who saw off Garbine Muguruza in straight sets.

Having triumphed in Dubai last week, the 15th seed has now recorded nine successive victories for the first time in her career after prevailing 6-2 6-2.

Ostapenko struck 39 winners and claimed 15 of 18 points on her opponent's second serve as she moved a step closer to a maiden title in Doha, having reached the final six years ago.

Meanwhile, Iga Swiatek is through to her first WTA 1000 semi-final on a hard court after a 6-2 6-3 win over Aryna Sabalenka.

The former French Open champion won seven out of eight breakpoints, while reeling off six successive games in the second set to secure a comfortable victory.

Next up for her is Maria Sakkari, who recorded her third win against Coco Gauff in four meetings after prevailing 6-3 6-3.

The sixth seed is through to her sixth semi-final at WTA 1000 level or above – and targeting her first such title.

Daniil Medvedev will become the new world number one after Novak Djokovic was beaten by Jiri Vesely at the Dubai Tennis Championships.

Medvedev entered this week knowing victory at the Mexican Open would see him move to the top of the ATP rankings for the first time.

But the Russian was still waiting to play his quarter-final on Thursday when his ascension was confirmed courtesy of Djokovic's last-eight defeat in Dubai.

Djokovic, a seven-time year-end number one, had led the rankings for 86 consecutive weeks, boosting his record total to 361 weeks.

In his first tournament since missing the Australian Open, however, the five-time Dubai champion struggled to match 123rd-ranked Vesely and went down 6-4 7-6 (7-4).

Djokovic might have known what to expect, having lost his only prior meeting with Vesely in Monte Carlo in 2016.

The Serbian looked like getting to grips with his opponent at the start of the second set, applying pressure, but was then broken again and had to respond strongly to reach a tie-break.

Again, Vesely led, and Djokovic's match was summed up by a double-fault immediately after winning back the mini-break, allowing the Czech to prevail.

The victor hailed the end of Djokovic's reign, saying in his on-court interview: "It's great for tennis to have somebody new as world number one again.

"We all know Novak missed the Australian Open, but he's been such a champion, as world number one for 361 weeks.

"Tennis needs new number ones, new generations coming up, so I think it's just great."

As Vesely advances, second seed Andrey Rublev will fancy his chances of a second straight ATP Tour title after his win at the Open 13 Provence.

Rublev stretched his winning streak to seven matches in coming from behind to beat Mackenzie McDonald and make the semi-finals, where he will play Hubert Hurkacz, who defeated Jannik Sinner.

Rafael Nadal hopes Alexander Zverev's withdrawal from the Mexico Open will "serve as a lesson" for him and other players when it comes to controlling their emotions on the court.

The world number three was pulled out of this month's tournament in Acapulco following an outburst where he hit the umpire's chair with his racquet in a tirade following a doubles defeat.

The ATP subsequently barred him from competition for a second-round singles clash, with several leading players, including Novak Djokovic, condemning the German's actions.

Speaking ahead of his own quarter-final this week, Nadal - who won a record-breaking 21st Grand Slam in at the Australian Open last month - stated he hoped the 24-year-old and other young players would learn that such behaviour is not acceptable.

"It's unfortunate, without a doubt," the Spaniard said. "I feel sorry for him as I have a good relationship with Alexander.

"In the end, he deserves the sanction because you can't act in this way.

"I think Sascha is aware of that and I hope this will serve as a lesson for him and for other young players who sometimes lose control on the court.

"I am not going to enter into what is or is not fair in terms of sanction," Nadal said. "But in the end you have to stop that type of attitude from becoming fashionable."

Zverev had been due to face Peter Gojowczyk in a singles encounter before he exploded at the end of his match with partner Marcelo Melo against Lloyd Glasspool and Harri Heliovaara.

Following an over-ruled decision from the umpire that handed the latter pair match point in a super tie-break, the duo decided the game with an ace the very next serve.

That led to Zverev smashing his racquet against the umpire's chair on multiple occasions in quick succession, punctured by a foul-mouthed tirade.

The Tokyo 2020 champion subsequently apologised for his behaviour. The Mexico Open continues until February 26.

Sebastian Vettel claims he has already decided not to participate in September's Russian Grand Prix after Russia launched an attack on neighbouring Ukraine.

Russian President Vladimir Putin's decision to attack Ukraine comes just days after Moscow elected to recognise the independence of two breakaway regions in the east of the country, and has led to Ukrainian counterpart Volodymyr Zelenskyy severing diplomatic ties with Russia and declaring martial law in the country.

The attack has drawn widespread international condemnation, and has already impacted the sporting world, with UEFA likely to strip St Petersburg of May's Champions League final and the Ukrainian Premier League being suspended.

Now Vettel claims he has already made up his mind on whether he would participate in the Russian Grand Prix, currently scheduled for late September in Sochi.

"I woke up after this morning's news, [and was] shocked," the four-time Drivers' champion said.

"For myself, my opinion is I should not go, I will not go.

"I think it's wrong to race in the country. 

"I'm sorry for the innocent people that are losing their lives, that are getting killed for stupid reasons and [because of] a very, very strange and mad [Russian] leadership.

"I'm sure it's something we will talk about, but as the GPDA [Grand Prix Driver's Association, the trade union representing Formula One drivers], we haven't come together yet."

Aston Martin driver Vettel, who won four consecutive world championships between 2010 and 2013, has been a director of the GPDA since 2010, and has previously spoken out on several other issues, being reprimanded for donning a pride flag at last year's Hungarian Grand Prix, before hosting an all-women's karting race prior to the Saudi Arabian Grand Prix later that year.

Two-time champion Fernando Alonso also called on Formula One to "do the best thing", while reigning world champion Max Verstappen echoed Vettel's sentiments. 

"When a country is at war it is not right to race there," Verstappen said on day two of pre-season testing in Barcelona.

Formula One had earlier refused to comment on the potential for the race to be relocated, issuing a statement which claimed it "was closely watching the very fluid developments, and at this time has no further comment on the race," and added that it will "continue to monitor the situation very closely."

Rory Darge will make his first start for Scotland in their Six Nations clash with France on Saturday after Gregor Townsend was forced to reshuffle his pack.

The Glasgow Warriors flanker is named alongside Hamish Watson and Magnus Bradbury in an all-new back row, with the latter making his first Scotland start since 2020.

A slew of injuries have forced a clutch of players – including Cam Redpath, Rory Sutherland, Javan Sebastian, Jonny Gray and Scott Cummings – to drop out of contention.

Six more faces have been called up to the wider squad, though only prop Oli Kebble makes the matchday party from those added following Scotland's 20-17 defeat to Wales last time out.

Sam Skinner moves up to partner Grant Gilchrist at lock while WP Nel drops to the replacement bench in what is ultimately two direct changes to the starting line-up.

France meanwhile make just the one change to their starting XV, after Gabin Villiere was ruled out with a sinus fracture sustained against Ireland.

Jonathan Danty comes back into the side after dropping out for the 30-24 win over Andy Farrell's side, while Yoram Moefana moves over to the wing to cover the Toulon star Villiere's absence.

Les Bleus remain the only side unbeaten in this year's Championship, but now face consecutive matches on the road after enjoying home advantage in their first two games.

Both teams will be out to make metres, with Scotland duo Stuart Hogg (843) and Finn Russell (747) having accrued more kicking metres than any other players in the 2022 Six Nations so far.

However, it is France (2,261) who have made the most as a team, with three different players having made 500+ metres with the boot for them in Antoine Dupont (682), Melvyn Jaminet (564) and Romain Ntamack (501).

This will be the 99th clash between the two nations in all competitions, with France claiming victory on 56 occasions and Scotland winning 39 times.

However, the honours are evenly split across their last 10 meetings with both sides picking up five wins apiece during that period.

Scotland team:  Stuart Hogg, Darcy Graham, Chris Harris, Sione Tuipulotu, Duhan van der Merwe, Finn Russell, Ali Price; Pierre Schoeman, Stuart McInally, Zander Fagerson, Sam Skinner, Grant Gilchrist, Rory Darge, Hamish Watson, Magnus Bradbury.

Replacements:  George Turner, Oli Kebble, WP Nel, Jamie Hodgson, Nick Haining, Ben White, Blair Kinghorn, Mark Bennett.

France team:  Melvyn Jaminet, Damian Penaud, Gael Fickou, Jonathan Danty, Yoram Moefana, Romain Ntamack, Antoine Dupont; Cyril Baille, Julien Marchand, Uini Atonio, Cameron Woki, Paul Willemse, Francois Cros, Anthony Jelonch, Gregory Alldritt.

Replacements:  Peato Mauvaka, Jean-Baptiste Gros, Demba Bamba, Romain Taofifenua, Thibaud Flament, Dylan Cretin, Maxime Lucu, Thomas Ramos.

Manu Tuilagi and captain Courtney Lawes will make their returns from injury in England's Six Nations showdown with Wales at Twickenham, while forward Taulupe Faletau will make his first appearance since last year's competition for the visitors on Saturday.

Both sides have posted a win and a loss in their two games so far to trail early leaders France in the table.

England bounced back from a 20-17 loss to Scotland by thrashing Italy 33-0 last time out, while Wales beat Scotland 20-17 after opening their title defence with a 29-7 defeat in Ireland.

Lawes returns from a concussion-enforced layoff which has kept him out of action since January, and regains the captaincy he held against South Africa last Autumn, replacing stand-in Tom Curry in the role.

Tuilagi also makes a welcome return from injury, but Ben Youngs will have to wait to win a record 115th cap after being named on the bench, as Eddie Jones makes four changes to the team which impressed in Rome, with Luke Cowan-Dickie and Kyle Sinckler also coming in.

Looking ahead to the match, Jones told England Rugby that he was content with his side's preparation, and was excited ahead of the showdown.

"We've prepared very well for this game, the squad have really come together on and off the pitch," said Jones. 

"Wales are a good, tough side and Six Nations champions, and it will make for an exciting Test match in front of a full Twickenham crowd.

"We've got a talented, young, hungry squad who have trained with real intensity this week. We're ready to go at them and can't wait to play in front of our supporters again."