Twenty-time grand slam winner Rafael Nadal has refused to put a timeline on his comeback to competitive tennis and will only return when he is in "good condition".

Nadal has not played since early August when he lost to Lloyd Harris in the third round at the Citi Open, before withdrawing from the US Open due to a recurring foot injury.

The 35-year-old Spaniard had in June pulled out of Wimbledon and the Tokyo Olympics shortly after losing to Novak Djokovic in the French Open semi-finals, saying he was "listening to my body".

Nadal, who will not return this season, has been seen training in Mallorca after last month receiving treatment in Barcelona, offering hope of a return.

"I want to recover from this injury in good condition," Nadal told a news conference.

"I don't know when I will play again, I work a lot every day, I follow a specific plan with a marked roadmap and with very clear objectives."

The next major on the calendar is the 2022 Australian Open to be played in Melbourne in January although Nadal would not commit to participating.

"I will not say what those objectives are, because there are always things that I can't control 100 per cent, but inside my head I'm clear on what my objectives are and I trust that things will follow a positive course," he said.

"Not everything depends on me, but I am confident that my daily efforts will pay off and allow me to return soon."

Daniil Medvedev was ousted from the Indian Wells Masters, the US Open champion and top seed stunned by former world number three Grigor Dimitrov in a thrilling comeback.

Dimitrov had been a set and a double break down against the Russian star on Wednesday, before launching a remarkable rally for his first win over a top-two opponent since 2016.

Meanwhile, second seed Stefanos Tsitsipas and third seed Alexander Zverev both won to secure their spots in the last eight.

MEDVEDEV SHOCKED IN THE DESERT

Dimitrov roared back to triumph 4-6 6-4 6-3 over Medvedev, who had won 18 of his past 19 matches on North American soil.

Bulgarian star Dimitrov trailed 4-1 in the second set after dropping the opener before stunning the first-time grand slam champion midweek.

"I just felt something at 1-4 and I calmed myself down and started to take better decisions and started to control the pace of the game, which I really believed helped me," Dimitrov – the 23rd seed – said. "In the end it was just very solid and smart play."

Dimitrov finished the match with 25 winners, while he was also excellent at the net, helping him claim his first quarter-final appearance at an ATP Masters 1000 event this season.

Medvedev sent down 5-1 aces but only managed a 54 per cent first-serve percentage, while he also faced 10 break points across the match. Dimitrov won five games in a row to claim the second set.

"I don't remember myself losing three service games, even four service games ever, I guess, on hard courts," Medvedev said.

"That shows how slow this court is and the conditions, more like clay, I would say, which I don't like, because to lose serve four times is just unacceptable."

Dimitrov will face eighth seed Hubert Hurkacz in the quarter-finals after he got past Australian Open semi-finalist Aslan Karatsev 6-1 6-3.

Medvedev added: "Grigor played [the] second part of the match better than anybody did against me [at the] US Open that I won. Playing this level, I don't see him losing to anybody, but let's see the result."

ZVEREV MAKES STATEMENT WITH MONFILS WIN

Olympic Games gold medallist Zverev bulldozed his way past 14th seed Gael Monfils 6-1-6-3 en route to the last eight.

German star Zverev claimed his 20th win from his last 21 matches, needing just over an hour to dispatch Monfils.

Zverev claimed 19 of 25 points at the net, hitting 19 winners including 11 with his forehand, while converting four of eight break points.

"I felt well on the court today. Gael is someone I haven't beaten before, so I knew had to play my best tennis and I definitely was not far away," Zverev said during his on-court interview.

Zverev will take on American 31st seed Taylor Fritz, who defeated 10th seed Jannik Sinner 6-4 6-3.

TSITSIPAS OUTLASTS DE MINAUR

French Open runner-up Tsitsipas saw off a tough challenge from Australian Alex de Minaur to secure his spot in the quarter-finals 6-7 (3-7) 7-6 (7-3) 6-2.

Tsitsipas fought back from a set down to win against the 22nd seed, triumphing in two hours, 43 minutes.

Greek star Tsitsipas showed grit to outlast the tiring De Minaur and will face 29th seed Nikoloz Basilashvili after he knocked off fellow seed Karen Khachanov 6-4 7-6 (8-6).

"That was incredible the way I just stayed in the match," Tsitsipas said. "I had to go through so many difficulties in order to find a solution and I executed towards the end of the match."

There were further top-10 casualties, with sixth seed Casper Ruud also bowing out 6-3 6-3 to 11th seed Diego Schwartzman, who will meet Cameron Norrie in the quarters.

Kyrie Irving reiterated he will stand by his decision to remain unvaccinated after the Brooklyn Nets confirmed the NBA All-Star will not play until he receives the COVID-19 vaccine.

Irving has not been vaccinated and is therefore ineligible to play in home games with the championship-chasing Nets due to New York City mandates.

Nets general manager Sean Marks confirmed on Tuesday that the franchise will not accept Irving playing on a part-time basis and thus overlook him for selection until he is vaccinated.

Irving, who is part of the Nets 'big three' alongside Kevin Durant and James Harden, broke his silence via social media on Wednesday, stating he will not change his stance leaving him in limbo.

"I'm standing with all those that believe in what is right and are doing what is right for themselves," Irving said in an Instagram Live. "Everybody has a personal choice with their lives. Everybody is entitled to do what they feel is what's best for themselves.

"Seeing the way this is dividing our world up, being vaccinated or unvaccinated. It's sad to see. It's creating a lot of division.

"Don't believe that I'm retiring or I'm going to give up this game for a vaccine mandate, don't believe any of that."

Irving stressed that he had no ill feeling towards the Nets nor his team-mates, explaining that his decision was in the interests of him and his family.

"I'm not going to sit here to give you information or wisdom beyond my years, I'm here just to stay real and true to me," he said. "It's my life, I get to do whatever I want with this, I get one body.

"You're telling me what to do with my body. It has nothing to do with the organisation. I'm going to put that out there, it has nothing to do with the Nets or my team-mates. This has everything to do with what's going in our world, I'm being grouped in with something's that's bigger than a game of basketball."

He added: "It's not being anti-vax. It's not about being one side or the other. It's about what feels good to me. I'm feeling uncertain about a lot of things and that's OK. If I'm going to be demonised for having more questions and taking my time to make a decision with my life, that's just what it is.

"I know the consequences of the decision I make with my life. I'm not here to sugarcoat any of that. It's crazy times that we're in… I haven't hurt anybody. I haven't committed a crime. I'm not out here acting dumb or stupid. I'm out here looking after my family and kids.

"If you choose to get the vaccine, I support you. Do what's best for you. I continue to pray for all those out there who have lost people to the pandemic to COVID."

Irving said he had not anticipated that he would be mandated to be vaccinated ahead of the new NBA season which starts for the Nets against defending champions the Milwaukee Bucks on Tuesday.

"What would you do, if you felt uncomfortable going into the season when you were promised that you'd have exemptions or you wouldn't be forced to have to get the vaccine," he said.

"This wasn't an issue before the season started. This wasn't something that I foresaw coming and I could prepare for it and I could strategise on what would be best for me and my family. I came into this season thinking I was going to be able to play ball."

In 2020-21, Irving averaged 26.9 points, 4.8 rebounds and 6.0 assists per game as the Nets lost in the Eastern Conference semi-finals to the Bucks. 

Irving enjoyed a career-high 50.6 field-goal percentage and joint-career best 92.2 free-throw percentage last season.

It has been reported Irving, who will not be paid for missed home games, will not be offered a contract extension by the Nets.

Irving added: "You think I really want to give up on my dream to go after a championship? You think I really just want to just give up my job? You think I want to sit at home and not go after the things with my team-mates that I've been able to grow with and learn with?"

Victoria Azarenka booked her spot in the Indian Wells Open semi-finals after a straight-sets victory over Jessica Pegula.

Azarenka – a two-time Indian Wells champion in 2012 and 2016 – accounted for Pegula at the WTA Premier 1000 event in the desert on Wednesday.

The former world number one will play 2017 French Open winner Jelena Ostapenko in the semi-finals after she got past American Shelby Rogers.

AZARENKA FLEXES TO BOOK SEMI-FINAL SPOT

Two-time Australian Open champion Azarenka won 6-4 6-2 over Pegula, who had beaten fourth seed Elina Svitolina in the fourth round.

Pegula hit 27 winners compared to Azarenka's 21 but the American had 30 unforced errors, with her 27th-seeded opponent also winning 81 per cent of first-service points to claim the edge.

"I started going for my shots from the beginning. I knew I have to apply pressure on her," Azarenka told her post-match news conference.

"I will have the moment where I will have opportunity. I think in the beginning of the match we had a lot of great rallies, a lot of points where I was like, 'Oh, maybe I got this one,' and she got me. I felt that I really just stuck to being aggressive and being consistent. I got my opportunities."

She added: "I felt that I really played well in the crucial moments. I felt like I stepped up a lot to the occasion. That's what I'm really happy with today."

OSTAPENKO FINISHES STRONG OVER ROGERS

Ostapenko earned her final-four spot with a see-sawing 6-4 4-6 6-3 win in two hours, 15 minutes over Rogers.

In a match that included 15 breaks of serve, Ostapenko won the final five games as she rallied to secure victory and her third semi-final of the year.

"I'm really happy to be in the semi-final. It's been a tough year for me, I've been up and down," Ostapenko – the 24th seed – said during her on-court interview. "I feel like my tennis is getting better and more consistent. Today I was trailing 3-1 in the third set and I was fighting to the last point."

Former world number five Ostapenko trailed 3-1 in the final set before finishing strong to set up a showdown with Azarenka. 

"She's a great player, great champion, such a fighter," Ostapenko said about Azarenka. "Hopefully I can just enjoy it."

Philadelphia 76ers head coach Doc Rivers is not sure if wantaway All-Star Ben Simmons will play for the NBA franchise after his surprise return.

Simmons has sought a trade from the 76ers and had been willing to sit out the entire 2021-22 season before showing up at Wells Fargo Center shortly before tip-off ahead of Monday's preseason game against rivals the Brooklyn Nets.

Reports claim Simmons had not spoken directly to team officials since late August, having missed all of training camp and preseason following a disappointing Eastern Conference semi-final loss to the Atlanta Hawks last season.

Doubts remain over the disgruntled Australian and Rivers was ambiguous regarding Simmons' playing status for the championship hopefuls.

"I don't know. He's voiced that, but we'll see how that works out," Rivers told reporters when asked about Simmons' trade status on Wednesday.

Simmons has reportedly generated interest from the likes of the Minnesota Timberwolves, Indiana Pacers, Golden State Warriors, Houston Rockets, Portland Trail Blazers and Cleveland Cavaliers but the 76ers are believed to have set a high price.

It comes after Simmons was heavily scrutinised following Philadelphia's shock playoff elimination at the hands of the Hawks in 2020-21.

A three-time All-Star and elite defender, Simmons and his shooting problems were laid bare during the 2021 postseason with the top-seeded 76ers.

Former number one draft pick Simmons had no fourth-quarter field-goal attempts in his last four games of the playoffs last season. He is the only NBA player in the last 20 seasons to have four consecutive postseason games with no field-goal attempts in the fourth quarter during a season in which he was an All-Star, according to Stats Perform.

"I'm assuming he's going to play, but who knows? I can't get in anyone's head," Rivers said with the 76ers due to meet the Detroit Pistons on Friday before opening their regular-season campaign against the New Orleans Pelicans on October 20.

Rivers added: "Whether we play him or not, that's going to depend on what we see this week.

"He's coming from behind, because he hasn't been in camp, obviously. Having said that, do you rush him and put him on the floor? That's a whole other subject.

"What we see this week is how we determine everything going forward."

Simmons averaged just 10.1 field-goal attempts in 2020-21 – a career low, which dropped to 7.9 in the playoffs. It was the same story with his scoring as it dropped to a career-worst 14.3 points per game and 11.9 in the postseason – both career lows.

Then there is Simmons and free throws. He was exposed by rival teams as they regularly sent him to the line, with the Melbourne-born guard making just 25 of 73 shots in the 2020-21 playoffs. His 34.2 free-throw percentage is the lowest ever in a single postseason.

Sixers team-mate Danny Green said: "We want him back. We want him with us. When he's in the building, we'll acclimate him appropriately. We just want everybody to come here, show up and do their part, do their jobs."

"I'll be able to see when he steps on the floor where his head's at. I don't feel like he needs to explain anything to me," added Seth Curry.

Brooklyn Nets head coach Steve Nash said the decision to keep Kyrie Irving away from the NBA championship hopefuls until he is cleared to play was a "difficult" but "sound" choice.

The Nets are set to be without seven-time All-Star Irving – who remains unvaccinated – for the start of their regular season unless his coronavirus vaccine status is resolved.

Irving is ineligible to play in home games or practice in Brooklyn due to New York City mandates, with people in New York requiring at least one coronavirus vaccine to enter indoor arenas such as the Nets' Barclays Center.

While Nash and former MVP James Harden are ready to move on without Irving, the duo insisted the title-chasing Nets would welcome back the 2016 NBA champion.

"Everyone had their say," Nash told reporters after Wednesday's practice. "It takes time to make decisions like that. This is a difficult decision. But I think it was a sound one and one that makes complete sense to everyone.

"We are just going to move on, and if things change, it would be incredible to have him back in the fold. It was a tenuous situation to have a player in and out like that. There's more clarity, and we can focus on the future and get going."

"For guys to be able to not have the uncertainty I think is important," Nash said. "It's not kind of hanging over us. A decision was made, and I think that can be beneficial to us starting to really build and have that understanding that this is what's happening instead of we were living in a world that was very uncertain.

"We weren't sure from one day to the next what was going to change or what was going to happen. That can be difficult, and that can put an extra strain on everybody."

In 2020-21, Irving averaged 26.9 points, 4.8 rebounds and 6.0 assists per game as the Nets lost in the Eastern Conference semi-finals.

Irving enjoyed a career-high 50.6 field-goal percentage and joint-career best 92.2 free-throw percentage last season.

Harden added: "Sean [Marks], Steve [Nash], me, KD [Kevin Durant], Kyrie, we all had conversations. Kyrie believes in his beliefs, and he stands firm and strong on that. And for us, we respect it. We all love Ky. But as far as us, we have a job to do.

"Individually, myself, I am still wanting to set myself up for a championship. And I feel like the entire organisation is on the same path and we are all in this as a collective unit."

"I have no say so in that," Harden said of the Irving decision. "I can only state my opinion, and we got to continue to move forward. Obviously, we would love to have Kyrie here."

"We still have two pretty good leaders on the team," Harden continued. "Know what I mean? And obviously Ky is our leader as well. We still have myself and Kevin [Durant]. [We] have to lead, which we are pretty good at that, and go out there and be great every single night."

Andy Murray has called for more players to get vaccinated against COVID-19 ahead of the Australian Open next year.

Unvaccinated players are expected to be allowed to compete, but are likely to have restrictions imposed on them in Melbourne.

The 34-year-old voiced his support for such restrictions, explaining that he understands why they would be put in place.

"My understanding is if you're unvaccinated you're still allowed to play, it's just the rules are going to be different," Murray said.

"You might just have to leave [for Australia] a few weeks earlier than everyone else. That's the player's choice. If the local government puts that in place then I would support that.

"It would be great if more players got vaccinated. Australia, in particular, has been very, very strict over there. The public there have had to endure a painful 18 months or whatever.

"If people are going to come into the country and potentially risk an outbreak in their community, yeah, that's understandable."

Murray was beaten in the Indian Wells third round by Alexander Zverev, who admitted he had not been vaccinated in April, on October 12 and the German declined to take a side in the debate.

"I fully respect the decisions of players that are not vaccinated," Zverev said. "I also do respect the decision that the Australian government is giving.

"I don't want to be in the middle of something which I kind of am not involved in because I don't have that issue of the two-week quarantine, all that. I don't want to go against anybody here."

Mercedes boss Toto Wolff has explained why Lewis Hamilton was forced to replace his engine and take a grid penalty on Sunday, refusing to rule out a repeat before the end of the season.

The Briton's 10-place penalty after topping qualifying contributed to a fifth-place finish at the Turkish Grand Prix, with team-mate Valtteri Bottas winning and title rival Max Verstappen finishing second to move six points clear of Hamilton in the championship standings.

However, Wolff revealed that the team felt they had no choice but to take a new Internal Combustion Engine (ICE) due to issues with Hamilton's previous power unit.

He insisted there had been no tactical timing to the decision, which was needed for technical reasons.

"We had to do it," Wolff told Sky Sports. "We saw some data on the Internal Combustion unit that didn't look very promising and a DNF is a total killer for the championship.

"We've seen over the course of the season that we've had some little gremlins that we weren't completely sure where they came from and how much performance they could potentially cost.

"So we'd rather have a new engine in the pool and that we understand that can possibly go longer.

"I think we understand much better now where the root cause lies and it's something that can happen from time to time if you just have a material issue, a batch problem and these are the things you need to consider."

The replacement power unit was Hamilton's fourth of the season, but Wolff suggested that it was not beyond the realms of possibility that he would be forced to take a fifth before the end of the campaign.

"The fourth one can last until the end of the season but there could be a moment where we say is it worth taking a fresh one because the other one is still at risk," Wolff continued.

"So this is something that is going to be really a work in progress."

There are six races to go in the 2021 Formula One season, a run that starts with the United States Grand Prix - an event Hamilton has won a record six times - on October 24.

Andy Murray is looking to give his body time to recover before the end of 2021 after going down to a narrow defeat against Alexander Zverev at the Indian Wells Masters.

Third seed Zverev triumphed 6-4 7-6 (7-4) in a hard-fought third-round battle with Murray on Tuesday.

Three-time grand slam winner Murray had previously defeated Adrian Mannarino and rising star Carlos Alcaraz in California.

He then ran Zverev close, with the German saying afterwards he felt Murray had produced his best performance since returning from hip surgery.

Murray agreed there were positives to take from his run, but was again frustrated not to get a statement win, having also fallen in five sets to Stefanos Tsitsipas at the US Open.

The Briton may play ATP Tour events in Antwerp and Vienna over the next fortnight but is soon eyeing a break that means he will not be putting himself forward for the Davis Cup Finals, which take place over 10 days from the end of November.

Recovering some freshness and spending time with his family are on Murray's agenda ahead of the Australian Open early in 2022.

"I've given a lot to the Davis Cup, and sometimes to my own detriment physically," Murray told BBC Sport after the loss to Zverev.

"The same thing happened last time I played Davis Cup at the end of 2019. I know there was coronavirus, but I was struggling with that really up until September time the following year.

"I also don't feel right now I would be playing, either. Obviously that would be up to [Team GB captain] Leon [Smith], but I'm not sure I deserve to play in that team.

"Right now, I'm not planning on playing the Davis Cup and with the late finish to it, and early departure to Australia, with my schedule between now and the end of the year, I am going to have to rest and take a break and give my body a chance to breathe.

"And I want to make sure in the offseason I get to spend as much time with my family as I can because I have been away from that recently and that will be case when I go to Australia as well."

On the defeat to Zverev, Murray said: "The positive for me to take from it is I had opportunities again.

"I didn't feel like I played a great match and still had chances, so that's positive. But I'm disappointed because I want to be winning these matches. I haven't in the past few months."

Both players forced six break points each and fired down eight aces apiece in an even contest.

Murray broke Zverev three times across the two sets and led in each of them, but ultimately it was the world number four who progressed to book a tie with Gael Monfils in the last 16.

It was the first time Zverev had beaten Murray in three attempts and he has now triumphed against each of the Big Four, with previous wins over Novak Djokovic, Rafael Nadal and Roger Federer to his name.

The Seattle Kraken fell just short in a thrilling comeback attempt as they made their NHL debut at the Vegas Golden Knights on Tuesday.

Trailing 3-0 in the second period, Seattle got their historic first goal through Ryan Donato before Jared McCann made it 3-2 just 72 seconds later.

Morgan Geekie levelled matters in the third, but the Golden Knights got the decisive seventh goal in controversial fashion through Chandler Stephenson.

Donato, a second-round pick for the Boston Bruins in the 2014 Entry Draft, said there was enough experience across the team to know they could recover from that early deficit even though the franchise is only in its first season.

"We just came together," said Donato. "We obviously hadn't been in that situation before, but we've all played on different teams and been in that situation on other teams. We knew as soon as we got one, the others would come."

Geekie, who managed two goals and an assist on a sparkling NHL debut for the Carolina Hurricanes last March, was delighted to have been part of a moment of history in Nevada.

"It's a spectacular city and they put on quite a show," the center said. "It was more exciting than anything, and to be a part of the new franchise is something special to be a part of."

Stephenson's goal came after the puck deflected in off his skate from a pass by Mark Stone, who had forced a turnover.

It was allowed to stand after a video review determined there was no intentional kicking motion on Stephenson's part – although he admitted he did not know if the goal would count at the time.

"I wasn't really too sure," Stephenson said. "I was kind of asking around what the ruling was, and I guess it being on the outside of my skate helped."

A frustrated Kraken coach Dave Hakstol said: "I know what I saw and believed. I thought it was a kicking motion. There's a grey area on those calls."

Next up for the Kraken is a visit to the Bridgestone Arena on Thursday to face the Nashville Predators.

Walker Buehler was hailed by his team-mate Mookie Betts and manager Dave Roberts after playing a crucial role in the Los Angeles Dodgers' win over the San Francisco Giants.

The Giants had the chance to book their spot in the NL Championship Series (NLCS) on Tuesday, but they were instead blown away by the Dodgers.

Buehler, coming in off three days' rest for the first time, was at his best, giving up just one run on three hits while striking out four batters in 4.1 innings.

Betts and Will Smith both homered in a convincing 7-2 win that sets up a winner-takes-all finale at Oracle Park in San Francisco on Thursday.

"I just know when our backs are against the wall that we have a guy named Walker Buehler that ends up getting us out of it," Betts told reporters. 

"He did it again today, but we got one more game. Julio [Urias] has to bring us home."

Roberts added: "I told [Buehler] after he came out, I was like, this is something now, you've checked a box.

"You've pitched in big games, elimination games, Game 163, and all this other kind of stuff, but never pitched on short rest. And a box was checked, and you came out ahead."

Buehler himself lauded the spirit and grit the Dodgers showed to level the series at 2-2 and keep their hopes alive.

"Tonight's a great example of 26 guys coming together and figuring out a way to survive," he said.