Rafael Nadal was stepping up preparation for Wimbledon by training on Mallorca's best grass courts on Thursday, an apparently positive sign that he intends to play in London.

The Australian Open and French Open champion said after his Roland Garros triumph at the start of June that he would only appear at Wimbledon if he could compete without needing anaesthetic injections in a troublesome foot.

The 36-year-old said he was given a couple of injections before every match and announced he would undergo radio frequency injections in a bid to feature at the third grand slam of the year.

Nadal is halfway towards a potential sweep of the four majors, defying the foot trouble by producing results that few saw coming. Rod Laver in 1969 was the last man to win all four singles majors in a calendar year.

Spaniard Nadal was pictured by organisers of the Mallorca Championships on Thursday, during a practice session on one of the tournament's plush courts.

Nadal, who hails from the island, is reluctant to undergo major surgery to prolong his career.

Wimbledon starts on June 27, and it is a tournament that Nadal has won twice, in 2008 and 2010.

He leads the all-time list of men's grand slam singles title winners, with 22 to his name now, two more than Roger Federer and Novak Djokovic have managed.

That is still one fewer than Serena Williams has managed during her stellar career, and the 40-year-old American rolled in to London on Thursday for another tilt at Wimbledon.

Due to injury, Williams has not competed on the WTA Tour since last year's championships at the All England Club.

She has received a wildcard into Wimbledon, where she has been a champion seven times, most recently in 2016.

Williams posted a video on Instagram of her arriving in London with daughter Olympia.

She intends to compete in doubles at Eastbourne, partnering Ons Jabeur, in the week leading up to Wimbledon.

Serena Williams' return to Wimbledon represents a "great example" to other players, according to Nick Kyrgios, who said tennis fans should not take her or other fellow greats Roger Federer, Rafael Nadal and Novak Djokovic, for granted.

Comparing the quartet to four-time NBA MVP LeBron James, Kyrgios says sports fans should enjoy the legends' "amazing" exploits while they still can.

It was confirmed on Tuesday that Williams – who has not played competitively since losing to Aliaksandra Sasnovich at Wimbledon last year – has been handed a singles wildcard to compete at the year's tournament, which begins later this month. 

Williams, now aged 40 and ranked 1,208th in the world, has won seven singles titles at Wimbledon, the last of which came in 2016, and 23 grand slams in total.

A spirited fightback from Nick Kyrgios saw the Australian beat second seed Stefanos Tsitsipas in the Halle Open on Wednesday.

Kyrgios suffered a disappointing semi-final defeat to Andy Murray in Stuttgart last week, but looked greatly improved against Tsitsipas as he recovered from a set down to win 5-7 6-2 6-4.

It was the second serve of both men where Kyrgios shone, winning 76 per cent (28 of 37) of points on his second serve, and 58 per cent (23 of 40) on his opponent's.

"Stef is one of the best players in the world at the moment and he's going to have some amazing results and I'm sure many, many grand slams," Kyrgios said following his win.

"I don't know if I can say the same for me, but I'm happy to still be able to produce this level with the tournaments I play. It is a testament to how hard I do work when I'm not playing."

He will face Pablo Carreno Busta in the quarter-finals after the Spanish sixth seed beat Sebastian Korda 6-4 0-6 6-3.

Elsewhere, Hubert Hurkacz will face Felix Auger-Aliassime in the last eight after defeating Ugo Humbert 7-6 (7-5) 6-3, while the Canadian also won in straight sets against Mackenzie McDonald 7-6 (9-7) 6-1.

The one remaining first round match saw number one seed Daniil Medvedev beat David Goffin 6-3 6-2 to set up a second round clash with Ilya Ivashka.

At the Queen's Club Championships, sixth seed Denis Shapovalov was eliminated by Tommy Paul 6-4 2-6 6-4, with the American now scheduled to face Stanislas Wawrinka in the second round.

It means that six of the eight seeds in west London were knocked out in the first round, with Matteo Berrettini and Marin Cilic the only remaining seeds. The latter sealed his place in the quarter-finals on Wednesday with a 7-6 (8-6) 7-5 win over Alexander Bublik.

Cilic will play Finland's Emil Ruusuvuori in the last eight after he beat home favourite Jack Draper 6-2 7-6 (7-2).

The best contest of the day came between Alejandro Davidovich Fokina and Alex de Minaur, with the former coming from behind to win 4-6 6-4 7-5 to set up a quarter-final with Botic van de Zandschulp, who beat Grigor Dimitrov 7-6 (7-5) 6-3.

Top seed Casper Ruud suffered a shock first-round exit at the Queen's Club Championships, going down in straight sets to British ATP Tour debutant Ryan Peniston in west London.

The French Open runner-up struggled to get going as he fell to a 7-6 (7-4) 7-6 (7-2) defeat to the world number 180, who was backed by a boisterous home crowd throughout.

Ruud struggled from the off as Peniston forced four break points in the Norwegian's first service game, and his miserable outing was rounded off when his opponent raced into a 5-1 lead before serving out a second-set tie-break.

After claiming the scalp of the world number five, Peniston told the BBC: "I can't really believe it. It feels like a dream. It doesn't feel real.

"I think I've been playing well. Casper is an unreal player and he did so well at the French Open, so I knew it was a tough ask. Four or five years ago I was sitting in the crowd just watching so to be here now is just unreal."

Ruud was not the only big name to fall at the first hurdle, with fifth seed Diego Schwartzman going down 6-1 6-4 against big-serving Sam Querrey to become the fourth of the top five seeds to fail to reach the round of 16.

Second seed and defending champion Matteo Berrettini is the exception after faring much better against another home favourite, cruising past Dan Evans 6-3 6-3, while Stan Wawrinka downed Francis Tiafoe 7-6 (7-2) 6-7 (6-8) 7-6 (7-5), and Denis Shapovalov's clash with Tommy Paul was suspended by darkness at one set apiece. 

Elsewhere, world number six Stefanos Tsitsipas progressed through his opening match at the Halle Open, beating Benjamin Bonzi 7-6 (7-1) 1-6 6-3 to set up an enticing last-16 clash with Nick Kyrgios, who bested Daniel Altmaier 6-3 7-5.

Fourth seed Felix Auger-Aliassime also progressed after being taken to three sets, beating Marcos Giron 6-3 5-7 6-3.

Meanwhile, defending champion Ugo Humbert will face a tough round-of-16 match against fifth seed Hubert Hurkacz after the Pole overcame Maxime Cressy 6-4 4-6 6-4. 

The US Open has announced players from Russia and Belarus will be allowed to compete in this year’s tournament despite the ongoing war in Ukraine.

The decision means world number one Daniil Medvedev can defend his title.

While the United States Tennis Association is allowing Russian and Belarusians to enter the tournament, the athletes must play under a neutral flag. The French Open, which concluded on June 5, allowed Russian and Belarusians to compete under the same conditions.

"Alongside the other grand slams, the ITF, the ATP and the WTA, the USTA, which owns and operates the US Open, has previously condemned, and continues to condemn, the unprovoked and unjust invasion of Ukraine by Russia," the USTA said in a statement.

"The USTA, standing with these other tennis entities, supported the banning of the Russian and Belarusian Tennis Federations from the ITF, and therefore all international team competitions, and the directive for players from those countries to play under a neutral flag when competing outside of international team competitions."

Since Russia launched its invasion of Ukraine in February, several organisations have banned Russian athletes from participating. Wimbledon, which starts on June 27, announced back in April that Russian and Belarusians would be barred from competing.

"We recognise that each organisation has had to deal with unique circumstances that affect their decisions," the USTA's statement read. "Based on our own circumstances, the USTA will allow all eligible players, regardless of nationality, to compete at the 2022 US Open."

The US Open begins on August 29 in New York.

Andrey Rublev was a surprise first-round loser at the Halle Open, while numerous seeds fell on the first day of the Queen's Club Championships.

Rublev came unstuck against Georgian Nikoloz Basilashvili, succumbing to a 7-6 (7-1) 6-4 loss as the world number eight crashed out in Germany.

Laslo Djere progressed after Henri Squire retired when 4-3 down, while sixth seed Pablo Carreno Busta secured a 6-3 7-6 (7-5) over French Open quarter-finalist Holger Rune.

Ugo Humber got the better of a topsy-turvy affair against qualifier Radu Albot, eventually triumphing 6-7 (4-7) 7-6 (7-4) 7-5 and Mackenzie McDonald defeated Marc-Andrea Huesler in straight sets.

Fourth favourite Taylor Fritz went down 6-3 6-3 against British wildcard Jack Draper, his first career win against a top-20 ranked player.

Reilly Opelka, the eighth seed, crashed out in the first round to New Zealand's Alex de Minaur, who claimed a straightforward 6-4 6-4 win.

Grigor Dimitrov, who won the event in 2014, battled past third seed Cameron Norrie 6-7 (2-7) 6-1 6-4, while Spaniard Alejandro Davidovich Fokina eased past compatriot Albert Ramos-Vinolas 7-5 6-4.

Alexander Bublik was 6-3 up before Italian Lorenzo Musetti retired, while seventh seed Marin Cilic capped the day's play in London by beating home hope Liam Broady 6-1 4-6 7-5.

Andy Murray has withdrawn from the Queen's Club Championships due to an abdominal injury, leaving his Wimbledon participation in doubt.

The former world number one made a great start to the grass-court season, reaching the Stuttgart Open final before falling to Matteo Berrettini.

Murray experienced discomfort during that showpiece in Germany, twice requiring medical timeouts as he battled the pain against the Italian.

The three-time grand slam winner Murray is a five-time Queen's champion but has had to pull out of the tournament, just two weeks before Wimbledon starts.

"After having a scan this afternoon, an abdominal injury means I won't be fit to compete at Queen's this year," Murray said in a statement.

"The tournament means a lot to me, and it's disappointing not to compete, especially after playing some good matches on the grass already."

The Scot was scheduled to play Italy's Lorenzo Sonego in the first round, but has been replaced by lucky loser Denis Kudla.

Daniil Medvedev has replaced Novak Djokovic as world number one ahead of the start of Wimbledon, where the Russian is banned from featuring.

The ATP and WTA boards decided to remove ranking points from the third grand slam of the year, with Russian and Belarusian players not allowed to compete due to the invasion of Ukraine.

The 26-year-old Medvedev will miss out from the grass-court major, which starts on June 27, alongside Andrey Rublev, Aryna Sabalenka, Anastasia Pavlyuchenkova and Victoria Azarenka.

But that could aid Medvedev's cause at the end of the tournament as Djokovic is the defending champion and therefore would have more ranking points to lose.

Djokovic has dropped to third in the world rankings, with the injured Alexander Zverev – who made the French Open semi-finals before retiring against Rafael Nadal – in second.

That means it is the first time since November 2003 that none of Djokovic, Rafael Nadal, Roger Federer or Andy Murray have appeared in the top two rankings spots.

Medvedev, who lost in the final of the Rosmalen Grass Court Championship on Sunday, became the first player other than Djokovic, Nadal, Federer or Murray to top the men's rankings in 18 years when he replaced the Serb as number one in February.

Andy Murray is unsure of the severity of his abdominal injury, but is hopeful it will not affect his preparations for Wimbledon.

The three-time grand slam winner struggled with the issue during Sunday's 6-4 5-7 6-3 defeat to Matteo Berrettini in the Stuttgart Open final.

Murray, who was competing in his first tour-level final on grass since 2016, twice received medical treatment but was able to finish the match.

He played five matches in Germany last week and four matches in Surbiton the week before en route to reaching the semi-finals.

Murray is due to play at Queen's this week before Wimbledon in a fortnight.

While frustrated with the manner in which his bid for a first grass-court singles title in six years ended, Murray says it is understandable that he is struggling physically.

"I felt like I was playing well enough to win and I got myself in a really good position going into the third set so a frustrating end to what was a good week," he said.

"I got some pain in my abdomen when I was serving. It's not something I've had before. I'll need to get it checked when I get home.

"This is the most matches I've played in two weeks since probably 2016. That's a really long time. 

"It's probably normal that I would feel some stuff in my body but I don't really know the severity of it. Hopefully it's all right."

Matteo Berrettini secured his sixth ATP Tour title with a 6-4 5-7 6-3 victory over Andy Murray at the Stuttgart Open.

Berrettini, playing in his first tournament since injury, raced out the blocks to break Murray in just his second service game, before the Scot failed to capitalise on four break points in the following game.

A similar pattern continued for the remainder of the first set, with neither player able to capitalise on break-point opportunities before Berrettini claimed the 1-0 lead with a booming forehand down the line.

That was the first set that Murray had lost in the tournament and he responded by producing a gritty performance in the second.

Berrettini squandered three chances to break at 4-4 before a double fault in the tie-break handed Murray three set points, and the three-time grand slam champion duly obliged to level.

The Italian opened the decider with a break, with Murray requiring a medical timeout for a leg injury, and the world number 10 claimed victory after his opponent had required more treatment.

Berrettini added a second Stuttgart crown to his name, having lifted the title in 2019, while it was his third grass-court success.

The 26-year-old will look to carry that form into Wimbledon, which starts on June 27, while the injury will be of concern to Murray, who was denied his first title since 2019.

Tim van Rijthoven completed an astonishing week at the Rosmalen Grass Court Championships by stunning Daniil Medvedev to claim the title on home soil.

World ranked 205 Van Rijthoven had never won an ATP main draw match before receiving a wild card into this event, in which he has enjoyed a dream week.

The Dutchman beat Felix Auger-Aliassime to progress to a final with Medvedev, who is set to return to world number one on Monday.

But he made light of the gulf in tour experience and ranking by powering to a 6-4 6-1 win.

He dominated the contest on serve, landing 74 per cent of his first serves and winning 84 per cent of his first-serve points. Van Rijthoven also lost just four points on second serve.

By contrast, Medvedev won just 56 per cent of points on his first serve and a paltry 38 per cent on his second, the US Open champion facing 10 break points in the contest.

Van Rijthoven raced into a 5-0 lead in the second set and, though Medvedev saved one match point to avoid a bagel, a fairytale win was sealed in the next game when the Russian could only return a serve into the net to spark jubilation among the home fans.

Stuttgart Open organisers are investigating claims made by Nick Kyrgios that he was racially abused at the tournament.

Kyrgios was defeated in the semi-finals by Andy Murray in straight sets on Saturday, with the former given a penalty by the umpire for smashing his racket and arguing with the crowd.

The Australian took to Instagram afterwards to say he was subjected to racial abuse by a spectator and called a "little black sheep".

"When is this going to stop? Dealing with racial slurs from the crowd?" he wrote.

"I understand that my behaviour isn't the best all the time – but 'you little black sheep', 'shut up and play' – little comments like this are not acceptable.

"When I retaliate to the crowd, I get penalised. This is messed up."

The tournament organisers responded on Sunday with a statement that read: "We stand for creating an inclusive environment for all players, staff members and visitors where discrimination of any kind is not tolerated.

"This attitude is lived by all people involved and responsible. These fundamental values are as important as values like fairness, tolerance and team spirit to us. Thus no discriminating actions by the spectators are accepted.

"We have expressed our regret towards Nick Kyrgios and his team and assured that any kind of discrimination is unacceptable. The incident is currently under investigation."

Roger Federer has reiterated his desire to make an ATP tour comeback in 2023, having not played since defeat at Wimbledon in 2021.

The 20-time Grand Slam champion has been forced to the sidelines following knee surgery last year.

At 40, questions have been posed whether the Swiss star might hang up his racquet after one of the most successful careers of the Open era.

But now, Federer says he intends to make a return next year, having committed to partnering Rafael Nadal at the Laver Cup in London before competing at the Swiss Indoors tournament in his home town of Basel.

"Yes, definitely," he told Swiss newspaper Tages-Anzeiger on his hopes for a return to the ATP tour next year. "How and where, I don't know yet. But that would be the idea.

"I haven't planned more than the Laver Cup and Basel yet. After Basel, the season is over anyway. It's important for me to get fit again so that I can train fully.

"Once I've done that, I can choose how many tournaments I play and where. The Laver Cup is a good start, I don't have to play five matches in six days.

"I will have to be able to do that in Basel. But I'm hopeful, I've come a long way. I'm not far away."

Rafael Nadal's latest grand slam triumph at the French Open is "unbelievable", says Roger Federer, who believes his rival "keeps raising the bar".

The Spaniard cruised through to both a record 14th success on clay at Roland Garros and a record-extending 22nd men's grand slam title with a straight sets demolition of Casper Ruud.

That made it two from two in 2022 for the 36-year-old, leaving him clear of both Federer and Novak Djokovic, who remain on 20 grand slam crowns each.

The former – who has enjoyed a strong sporting rivalry and friendship with Nadal throughout their intertwined careers – however has nothing but praise for his latest achievement.

"I didn't watch the final," Federer told Swiss newspaper Tages-Anzeiger. "I watched the quarter-final [against Djokovic] a bit before I went to sleep.

"In general, it's just unbelievable what Rafa has achieved. The record of Pete Sampras, which I beat, was 14 grand slam titles.

"Now Rafa won the French Open 14 times. That's unbelievable. I was happy for him that he did it again.

"Hats off to Rafa. After the 10th, 11th time, I already thought: 'This can't be.' He keeps raising the bar. It's gigantic."

Federer has been unable to add to his own haul of grand slams, having missed the tail-end of 2021 and start of 2022 through injury as he continues to recover from knee surgery.

The 40-year-old Swiss star acknowledged he has not yet plotted anything more than competing in the Laver Cup and Basel Open in October, stressing he will focus on achieving full fitness rather than setting a return date.

"After Basel, the season is over anyway," he added. "It's important for me to get fit again so that I can train fully. Once I've done that, I can choose how many tournaments I play and where.

"The Laver Cup is a good start, I don't have to play five matches in six days.

"I will have be able to do that in Basel. That's why I have to prepare for it in practice. I'm curious myself what's still to come.

"But I'm hopeful, I've come a long way. I'm not far away. The next three or four months will be extremely important."

On a return to top-class tennis in 2023, Federer said that such a move remained the aim, adding: "Yes, definitely. How and where, I don't know yet. But that would be the idea. Definitely."

Nick Kyrgios said he was racially abused by a spectator during his semi-final with Andy Murray at the Stuttgart Open on Saturday.

Murray won the match 7-6 (7-5) 6-2 to advance to the final, where he will play Matteo Berrettini on Sunday.

However, Kyrgios had greater concerns as he took to Instagram afterwards to say he was called a "little black sheep" by someone in attendance.

"When is this going to stop? Dealing with racial slurs from the crowd?" he wrote.

"I understand that my behaviour isn't the best all the time – but 'you little black sheep', 'shut up and play' – little comments like this are not acceptable. When I retaliate to the crowd, I get penalised. This is messed up."

Meanwhile, Murray's win saw him reach his first tour-level final on grass since 2016.

The three-time major winner upset Stefanos Tsitsipas in the previous round – his first win over a top-five opponent in six years – and followed that up against Kyrgios with another impressive performance.

"A lot of ups and downs, but I kept going and kept working and finally managed to get to another one. I am proud of the effort I have put in," Murray said after securing the win.

He moves up to 47th in the live ATP rankings – the first time he has been in the top 50 since May 2018 – and his clash with Berrettini will be his 70th career final.

"You're always battling yourself as well as the opponent, it's one of the difficult things about individual sports," he added in relation to Kyrgios' frustrations during the game.

"Nick has the potential to be one of the best players in the world, there's absolutely no question about that. But he obviously got very frustrated in the second set and made it a lot easier for me.

"I'm happy to be in the final. I've played well this week and I've got a great opportunity against Matteo tomorrow."