Casper Ruud fought back from a set down to claim his maiden ATP Finals victory after late replacement Cameron Norrie made a blistering start in Turin.

Norrie stepped in as a second alternate at the season-ending event at the Pala Alpitour following Stefanos Tsitsipas' withdrawal due to an elbow injury on Wednesday.

The Briton got off to a flyer in his first ATP Finals match, but eighth seed Ruud hit back to win 1-6 6-3 6-4 in the night session after losing his opening Green Group contest to world number one Novak Djokovic.

Ruud lost only two games when the two met in the San Diego Open final last month and Norrie looked hungry for revenge as he bossed the first set, grasping both break-point opportunities.

Ruud won the only break point of the second set to force a decider and just one further break was enough to get him up and running in the competition.

After becoming the first Norwegian to win an ATP Finals match, Ruud will do battle with Andrey Rublev to join Djokovic in qualifying from the group.

WINNERS/UNFORCED ERRORS 

Ruud  – 32/22
Norrie– 30/20

ACES/DOUBLE FAULTS 

Ruud  – 10/0
Norrie – 6/3

BREAK POINTS WON 

Ruud – 2/5
Norrie – 2/2

WTA chairman and CEO Steve Simon says he is even more concerned about Peng Shuai after receiving an email purportedly written by the two-time major doubles champion saying she is safe.

Peng has reportedly been missing since making sexual assault allegations against a former top Chinese government official.

She posted on Chinese social media site Weibo allegations against Zhang Gaoli – the ex-vice premier and member of the Chinese Communist Party's Politburo Standing Committee – claiming he had forced her to have sexual relations with him.

Chinese state media sent a statement to Simon with an email supposedly written by Peng stating the allegations of sexual assault were not true and that she is "resting at home."

The WTA boss on Wednesday reacted by saying he has "a hard time believing" Peng wrote the email and he is even more worried about the 35-year-old.

"The statement released today by Chinese state media concerning Peng Shuai only raises my concerns as to her safety and whereabouts," he said in a statement.

"I have a hard time believing that Peng Shuai actually wrote the email we received or believes what is being attributed to her. Peng Shuai displayed incredible courage in describing an allegation of sexual assault against a former top official in the Chinese government.

"The WTA and the rest of the world need independent and verifiable proof that she is safe. I have repeatedly tried to reach her via numerous forms of communication, to no avail.

"Peng Shuai must be allowed to speak freely, without coercion or intimidation from any source. Her allegation of sexual assault must be respected, investigated with full transparency and without censorship.

"The voices of women need to be heard and respected, not censored nor dictated to."

The WTA called for a full investigation into the matter last week.

Peng's social media post, along with all of her other content, has been removed from Weibo.

A spokesperson for the ministry of foreign affairs informed reporters he was not aware of the situation.

"I have not heard of the issue you raised," the spokesperson said via a widely released statement. "This is not a diplomatic question."

South Africa director of rugby Rassie Erasmus has been banned from all rugby activities for two months for his conduct towards match officials during a series win over the British and Irish Lions.

Erasmus, head coach of the Springboks for their 2019 World Cup triumph, has also been suspended from all matchday activities with immediate effect until September 30 next year.

World Rugby on Wednesday revealed that an independent misconduct committee found the 49-year-old was guilty of all six charges that were brought against him.

Erasmus accused the Lions of "reckless and dangerous" play in their 22-17 win in the first Test in July and hit out at the standard of refereeing from Nic Berry.

He also made the claims in a 62-minute clip posted on social media as he highlighted what he felt were a number of calls that went against the world champions.

Erasmus also retweeted clips from an anonymous Twitter user, alleged to be one of his own accounts, highlighting "questionable calls".

In summary, World Rugby revealed he had been guilty of threatening a match official that unless a requested meeting took place, he would publish footage containing clips criticising the match official's performance and then making good on that threat; published or permitted to be published the video containing numerous comments that were either abusive, insulting and/or offensive to match officials.

He was also found to have attacked, disparaged and/or denigrated the game and the match officials; did not accept or observe the authority and decisions of match officials; published or caused to be published criticism of the manner in which a match official handled a match.

The committee also deemed Erasmus to have engaged in conduct or activity that may impair public confidence in the integrity and good character of match official(s); and brought the game into disrepute when he published or caused to be published the 'Erasmus Video'.

Erasmus was warned about his future conduct and told to issue an apology to the relevant match officials.

SA Rugby were also charged with not ensuring Erasmus complied with the World Rugby Code of Conduct and/or permitted him to commit acts of misconduct; and/or did not publicly correct any comments or publications by or on behalf of the director of rugby that amounted to misconduct.

A fine of £20,000 was issued to SA Rugby along with a warning as to future conduct. The organisation was told there must be an apology to the relevant match officials.

SA Rugby issued a joint statement along with Erasmus confirming both parties will exercise their rights to appeal the verdicts.

Novak Djokovic felt he had produced "a great performance" to cruise past Andrey Rublev and reach the last four at the ATP Finals in Turin.

A 6-3 6-2 triumph for Djokovic in just 68 minutes on Wednesday moved him into the semi-finals with a match to spare.

Djokovic will face alternate Cameron Norrie on Friday already knowing he will finish top of the Green Group after straight-sets wins over Casper Ruud and Rublev this week.

The Serbian dropped serve in the first game of the match against world number five Rublev but had few problems from then on.

Victory took Djokovic to 50 wins on the ATP Tour this season. He has been beaten just six times in 2021 and is now two victories away from a record-equalling sixth ATP Finals success. 

The 34-year-old has won 12 of his 13 matches since the start of the US Open, losing only to Daniil Medvedev – his main rival for glory again here – in the final of that competition.

"It was a great performance overall," said Djokovic, who won 27 of 31 points on his first serve and had 14 aces to zero double faults. 

"I served well and that helped tremendously. I wanted to put him out of his comfort zone, taking away the time and mix up the pace.

"I knew that I had to be on my toes and start well.

"I dropped my serve again like in the first match against Ruud. It was quite a nervous start from both of us until 4-3, then with new balls I somehow managed to find the right shots at the right time. 

"I made him play. Winning the first set I put additional pressure on him, and I started to maybe play more consistently from the back of the court."

Rather than 2019 winner Stefanos Tsitsipas, who has withdrawn with an elbow injury, Briton Norrie is up next for the world number one at the ATP Finals.

"I always like playing new players, particularly in one of the greatest tournaments in the world here in Turin," added Djokovic.

"Cameron deserves to be here, it is not lucky. He worked his way to Turin with great wins in Indian Wells and some other tournaments.

"So it will be fun to watch him play against Ruud and I will get ready for my next match."

Djokovic has now made the last four of the ATP Finals on 10 occasions, with this being his 40th career win in the tournament (16 defeats).

Novak Djokovic secured his spot in Saturday's semi-finals with a straight-sets victory over Andrey Rublev at the ATP Finals in Turin.

The world number one claimed a 6-3 6-2 win over world number five Rublev in the first-ever meeting between the two on Wednesday.

Djokovic confirmed his place as winner of the Green Group with his second consecutive victory, having also beaten Casper Ruud in straight sets in his opening match on Monday.

Despite Rublev's ranking, Djokovic dispatched his opponent in one hour and eight minutes as he raced to a 40th career ATP Finals victory and his 50th on tour this year.

The start of the match was close as the Russian broke Djokovic in the opening game, but the world number one responded in kind in the next game and eventually eased away to win the first set 6-3 as Rublev made some costly unforced errors. 

The second set was decided in similar fashion, with Rublev fading as Djokovic, who faces Cameron Norrie in his last round-robin match on Friday, broke twice to comfortably claim the victory.

WINNERS/UNFORCED ERRORS 

Djokovic – 19/8
Rublev – 18/26

ACES/DOUBLE FAULTS 

Djokovic – 14/0
Rublev – 6/1

BREAK POINTS WON 

Djokovic – 4/6
Rublev – 1/1

Formula One technical director Ross Brawn believes the sprint qualifying race at the Sao Paulo Grand Prix was the best yet ahead of an expansion of the format in 2022.

A dramatic race weekend in Brazil saw Max Verstappen top qualifying on Friday, Valtteri Bottas win the sprint event to claim pole position on Saturday, before Lewis Hamilton triumphed in a thrilling main event on Sunday.

Hamilton had started the sprint at the back of the grid and charged all the way up to fifth to improve his grid position for the main race, which he ultimately battled to win from 10th after a grid penalty.

His move up the field was the highlight of an entertaining sprint that had more fireworks than the previous two held in 2021 at Monza and Silverstone.

The sprint schedule also leads to more meaningful action on the Friday, when qualifying takes place rather than the normal practice sessions.

"Saturday's F1 Sprint was, in my view, the best one of the three," Brawn wrote in his column for the F1 website. "It had plenty of action, with loads of battles – including Lewis carving his way through the field. 

"It was a great Saturday afternoon of entertainment, an appetiser for the main course on Sunday.

"We had a fabulous Friday, too, with a dramatic qualifying session. It can never be underestimated how much of an impact the Sprint has on a Friday.

"With only one hour of practice, it creates some jeopardy heading into the rest of the weekend, as the teams are not as prepared as they can be."

Brawn has previously revealed F1 plans to double the number of sprint race weekends to six in 2022 and are pondering some small but significant changes.

Presently points are only awarded to the top three drivers in the sprint but that could be increased to the top 10 to align with the main race and encourage more daring overtakes further down the field.

New cars that promote overtaking are already coming in for next year, while Brawn has accepted that the formal award of pole position should come after Friday qualifying rather than for the Saturday sprint.

He added on Wednesday: "We think the foundations are very strong for the Sprint and will be presenting more details of our plans for six events in 2022 in the coming weeks in discussions with the FIA and the teams.

"There are things we need to tweak but Brazil showed the Sprint is a great addition to the weekend. 

"It has made Friday, Saturday and Sunday big moments that are exciting for all of us."

There are three races to go in the F1 season, with Verstappen leading Hamilton by 14 points going into the inaugural Qatar Grand Prix this week, with the constructors' championship also finely poised.

"We're seeing a titanic battle for this year's two championships," added Brawn.

"The race in Brazil was just another twist in an engrossing tale. It’s been fantastic. No one knows what will happen next.

"We have got two new venues to visit in Qatar and Saudi Arabia, before heading to the finale in Abu Dhabi where the circuit has had a series of modifications. The stage is set."

Lewis Hamilton will continue his late push to keep his crown as Formula One world champion at the inaugural Qatar Grand Prix this week.

Seven-time world champion Hamilton has three races left in his quest to deny Red Bull rival Max Verstappen glory.

Verstappen leads the championship by 14 points, a lead that was reduced by Hamilton's memorable win at the Sao Paulo Grand Prix on Sunday.

Hamilton started the sprint qualifying race at the back of the grid and then the main event on Sunday in 10th on the grid, sitting 21 points adrift.

Damage limitation would have been a reasonable aim, but instead Hamilton turned the tables with a famous win that hauled him back into contention.

A tense and thrilling title race has also proven controversial, with Mercedes this week requesting a review of the decision not to take any action against Verstappen for an incident involving the pair in Brazil.

Mercedes team principal Toto Wolff branded Verstappen's defence while Hamilton attempted to pass him as "over the line", but Red Bull boss Christian Horner saw nothing untoward.

Verstappen still has the precious lead that means he has the title race in his hands. The Dutchman knows he will be world champion if he wins the next two races while also setting the fastest lap.

In a remarkable year, he has finished in the top two for 15 of his 16 finished grands prix this year.

But a surging Hamilton - looking for a record eighth championship that will see him surpass Michael Schumacher - will not relinquish his title without an almighty scrap, and a night race at Losail Circuit will provide the latest twist.

LAST TIME OUT

Hamilton claimed a crucial win with a magnificent performance in Brazil.

Verstappen had extended his lead in the title race on Saturday to 21 when he finished second behind Hamilton's Mercedes team-mate Valtteri Bottas in the sprint qualifying race.

Hamilton had his Friday qualifying session result ruled out due to a DRS infringement, meaning he started the Saturday sprint in last, but impressively charged up from 20th to fifth.

A five-place grid penalty meant he still had to start back in 10th for the main event on Sunday, yet the reigning world champion delivered, gaining eight places within the early exchanges before, at the third attempt and after the controversial moment, he overtook Verstappen with 12 laps remaining.

Poleman Bottas had been unable to keep control of the race after Verstappen and Sergio Perez nipped ahead to make it a Red Bull one-two early on, but Hamilton ensured it was Mercedes' weekend as he cut the Dutchman's lead in the championship.

Bottas ultimately took third, with Perez settling for fourth as well as a point for the fastest lap which stopped Hamilton from making further gains on Verstappen. Charles Leclerc was the best of the rest in fifth for Ferrari.

WHAT TO EXPECT IN QATAR

A new circuit means there is no past form for teams or drivers to look back on, but Hamilton goes into the week as favourite for victory on the back of his Brazil brilliance.

The Briton has won five of the last seven GPs raced in Arabian Peninsula, most recently this year in Bahrain when he won despite Verstappen starting from pole.

This will be Hamilton's 35th different circuit – he has won at 29 of the previous 34 he has appeared at during his F1 career and taken pole at 30 of them.

As well as the thrilling battle in the drivers' standings, Mercedes are now 11 points clear of Red Bull in a race for constructors' glory that looks poised to go down to the wire.

McLaren, meanwhile, have fallen to 31.5 behind Ferrari in the battle to finish third as they continue to lose momentum, with Lando Norris and Daniel Ricciardo in need of a morale-boosting result in Qatar.

After this race, the Qatar Grand Prix will move to a new purpose-built circuit from 2023 as part of a 10-year contract for the event.

TOP FIVE OPTA FACTS

F1 history - Losail in Qatar will be the 75th circuit to host an F1 race, the 11th in the Asia and the third in the Arabian Peninsula after Sakhir in Bahrain and Yas Marina in Abu Dhabi.

Hamilton thrives - In Brazil, Hamilton become the F1 driver to win the most races in the Americas (18) and the Briton will now be looking to be the driver to win the most races in the continent of Asia, surpassing Sebastian Vettel (28).

Masterful Max - Verstappen comes to this contest after equalling the tally of podiums (57) earned by Nico Rosberg, the last person other than Hamilton to win the title. The Dutchman is six points away from being the eighth F1 driver to surpass the 1,500 mark.

Three in a row? - Mercedes have taken the pole position in the last two qualifying sessions (both by Bottas in Mexico and Brazil) and are now looking to equal their best run this season, the three taken between Emilia Romagna and Spain (Hamilton x2 and Bottas).

900 up - McLaren will become the second team to reach 900 GPs in F1 after Ferrari (1,027). The British team appeared for the first time in Monaco 1966 with only one driver, Bruce McLaren, who failed to finish that race. This year they are the only team to have recorded a one-two finish (in Monza).

CHAMPIONSHIP STANDINGS

Drivers 

1. Max Verstappen (Red Bull) 332.5 
2. Lewis Hamilton (Mercedes) 318.5 
3. Valtteri Bottas (Mercedes) 203
4. Sergio Perez (Red Bull) 178
5. Lando Norris (McLaren) 151

Constructors 

1. Mercedes 521.5 
2. Red Bull 510.5 
3. Ferrari 287.5 
4. McLaren 256
5. Alpine 112

Stefanos Tsitsipas has been forced to withdraw from the ATP Finals in Turin because of an injury to his right elbow, with Cameron Norrie taking his place.

Tsitsipas was beaten in straight sets by Andrey Rublev - who faces Novak Djokovic next - in his opening Green Group match on Monday and was scheduled to take on Casper Ruud on Wednesday.

However, the 23-year-old's elbow issue means that ATP Finals debutant and Indian Wells winner Norrie will play Ruud instead, in his first match of the group stage.

Ruud's first outing ended in a straight-sets defeat at the hands of Djokovic, although the Norwegian may be more confident of his chances in this match, having beaten Norrie 6-0 6-2 in their only other encounter last month at the San Diego Open final.

Tsitsipas - who won the ATP Finals in 2019 - was forced to retire from his Paris Masters clash against Alexei Popyrin last month, also due to an ongoing elbow problem, and the Greek is no longer able to play through the pain.

Norrie is the second alternate to join the competition after an injury to one of the original eight. Jannik Sinner replaced fellow Italian Matteo Berrettini and went on to defeat Hubert Hurkacz in the Red Group on Tuesday.

Naomi Osaka has expressed her concern over the situation of Peng Shuai, who has not been heard from publicly since accusing China's ex-vice premier of sexual assault.

Peng, a Wimbledon doubles champion in 2013, posted allegations against Zhang Gaoli on Chinese social media site Weibo last week.

The post, along with all of Peng's other content, has since been removed from the site.

Multiple reports suggested the 35-year-old had subsequently not been seen or heard from, and the Women's Tennis Association (WTA) called for a full investigation into the matter.

There has so far been no response from the Chinese government to the allegations.

However, a spokesperson for the ministry of foreign affairs informed reporters he was not aware of the situation.

"I have not heard of the issue you raised," the spokesperson said via a widely released statement. "This is not a diplomatic question."

Now Osaka, a four-time major champion and one of the biggest names in the sport, has used her platform to question the situation.

"Hey everyone, not sure if you’ve been following the news but I was recently informed of a fellow tennis player that has gone missing shortly after revealing that she has been sexually abused," Osaka wrote in a statement published to her official Twitter account.

"Censorship is never ok at any cost, I hope Peng Shuai and her family are safe and ok. I'm in shock of the current situation and I'm sending love and light her way."

Osaka concluded her post with the hashtag: "#whereispengshuai".

On Sunday, WTA chairman Steve Simon addressed the matter in a statement that said: "The recent events in China concerning a WTA player, Peng Shuai, are of deep concern.

"As an organisation dedicated to women, we remain committed to the principles we were founded on – equality, opportunity and respect.

"Peng Shuai, and all women, deserve to be heard, not censored. Her accusation about the conduct of a former Chinese leader involving a sexual assault must be treated with the utmost seriousness.

"In all societies, the behaviour she alleges that took place needs to be investigated, not condoned or ignored. We commend Peng Shuai for her remarkable courage and strength in coming forward.

"Women around the world are finding their voices so injustices can be corrected.

"We expect this issue to be handled properly, meaning the allegations must be investigated fully, fairly, transparently and without censorship.

"Our absolute and unwavering priority is the health and safety of our players. We are speaking out so justice can be done."

Osaka's comments follow on from men's world number one Novak Djokovic expressing his concern over the situation when speaking to the media earlier this week.

Djokovic said: "I don't have much information about it. I did hear about it a week ago.

"Honestly, it's shocking that she's missing, more so that it's someone that I have seen on the tour in the previous years quite a few times.

"It's not much more to say than hope that she will be found, that she's OK. It's just terrible. I can imagine just how her family feels that she's missing."

Doc Rivers is optimistic his injury-hit Philadelphia 76ers will improve despite seeing them lose a fifth game in a row as they fell 120-85 to the Utah Jazz on Tuesday.

Last season's Eastern Conference top seeds were missing MVP runner-up Joel Embiid, fellow All-Star Ben Simmons and Matisse Thybulle as they slipped to 8-7 after being overwhelmed by the Jazz.

Having won eight of their first 10 games this season, Philadelphia have now lost five straight - the first time they have done so since December 2017 - but Rivers is confident his team will get back to winning ways soon.

"We're in a little rut with guys out but you work through it. We'll get through it," Rivers told reporters after the defeat.

"There's no cavalry coming right now. We've got to play with what we have, we understand that. We've just got to do better.

"We don't have a margin of error in games. We almost have to play perfect to have a chance to win a game, and for a while we were doing that. Right now, we're not."

When asked about the absence of Embiid, Rivers added: “I don't talk about guys that aren't here. It's obvious you miss Joel Embiid and Matisse, but I'm not going to waste time talking about that.

"I've got to get our guys that are here to just keep hoping and keep getting better and see where we can get a win."

The Sixers head coach did have one positive to reflect on from the night, with rookie Charles Bassey posting five points, four rebounds and one block in 10 minutes off the bench.

"I thought he was fantastic," Rivers said. "He knows the coverages and stuff already. That's really impressive for a young guy. He actually got on a guy late in the game because the guy didn't do the right coverage. Just watching him, he knows how to play. He's raw, but I like how he plays."

Roger Federer has confirmed he will not participate at the Australian Open and said he would be "extremely surprised" if he is fit enough to play at Wimbledon.

The 20-time grand slam winner has played just 13 matches in 2021 as he recovers from a third knee surgery in the space of 18 months, with Federer's last appearance a disappointing straight-sets loss to Hubert Hurkacz in the quarter-finals at SW19 in July.

The Swiss great has now officially confirmed he will not be at Melbourne Park for the first grand slam of 2022, while it remains touch-and-go whether Federer will be back at Wimbledon this year.

"At the moment, I expect to be able to return in the summer of 2022," he told Tribune de Geneve having confirmed playing in Australia is out of the question. 

"The next four or five months are crucial. In the spring, I will already see things much more clearly. The truth is that I would be incredibly surprised if I were to play again at Wimbledon [in 2022]."

"When you get right down to it, it doesn't make much difference whether I return in 2022 or not until 2023, at 40 or 41. It doesn't matter. The question is rather will I manage to torture myself again day after day for my comeback?

"My heart says 'yes' today. So, I'm taking things step by step. I have experienced similar challenges many times in my career sometimes without the public being aware of it. Even though I know that the end is near, I want to try to play some big matches again. It won't be easy but I will try."

Now aged 40, Federer's latest injury setback led to suggestions he could call time on his glittering career, though his coach Ivan Ljubicic this week said he was not contemplating such a decision.

Federer accepts he may never play in a grand slam final again and is at peace with that fact, but still "believes in these miracles" as he aims to once again compete among the elite level.

"If I do my rehabilitation intensively, there is a chance that I will get back to a high level," he added. 

"If I do strength training, go on the bike, swim, do balance exercises, work on my upper body, then I believe in it.

"Will I return to the Tour for a smaller round or for something bigger? Nobody knows, neither the doctors nor me. But I'm fighting for it. To be clear, my world will not collapse if I never play another grand slam final.

"But it is my ultimate dream to return once again. And in fact, I still believe in it. I believe in these kinds of miracles. I have already experienced them. 

"Sports history sometimes writes such miracles. I am realistic – it would be a great miracle but there are miracles in sport."

Brooklyn Nets head coach Steve Nash says his side are not in the category of this season's NBA elite after a blowout 117-99 loss to the 12-2 Golden State Warriors on Tuesday.

The star-studded Nets, who were billed as title favourites this season, were humbled on their home court, with their record moving to 10-5.

The Nets added James Harden in January alongside Kyrie Irving and Kevin Durant last season, but crashed out in the conference semi-finals to eventual champions the Milwaukee Bucks.

Brooklyn are 0-4 against this season's early contenders, the Warriors, Miami Heat, Chicago Bulls and Bucks.

"Well, I just don't think we're in that [elite] category yet," Nash said at the post-game news conference. "We've got a lot of work to do.

"We're trying to improve as a group, get better and hopefully we can find a way to overcome some of our deficiencies by the end of the year.

"The guys have been great buying into the things we want to do defensively. I think offensively we have all these different line-ups, different backgrounds, styles of play, 10 new players in our team, it takes time.

"We started the year with a continuity plan from last year that got thrown out when Ky [Kyrie Irving] didn't come back. Tonight was a great lesson for us that we've got to double down on some of our principles when the going gets tough."

Durant had his lowest points return for the season with 19, as the Warriors piled on a 35-18 third quarter, before benching star guard Stephen Curry, who was in foul trouble, for the majority of the final period.

Harden has had a slow start to the season by his standards after rehabbing a hamstring injury over the offseason, averaging 19.8 points per game.

The 32-year-old scored 24 points in Tuesday's defeat but remained bullish about the Nets, reiterating it is still early in the season.

"The goal is to be the best team at the end of the season, in the postseason," Harden said at the post-game news conference.

"That's the goal. But probably not [there yet]. We're probably nowhere near. But it's a long season for us to get better, and we will continue to get better."