Rafael Nadal believes he can win a 14th French Open title despite other players arriving at Roland Garros in better condition, as he labelled the venue the "most important" place in his tennis career.

Nadal won a record 21st grand slam title when he recovered from two-sets down to beat Daniil Medvedev in a thrilling Australian Open final in January, and has won 13 of the last 17 editions of the year's second slam.

However, Nadal admitted he was "living with an injury" after falling to a third-round defeat to Denis Shapovalov at the Internazionali d'Italia earlier this month, and will need to overcome a tough draw to build on his fine record in Paris, with Novak Djokovic and Carlos Alcaraz both on his side of the bracket.

Ahead of his first-round clash with Australia's Jordan Thompson, Nadal insisted that while he was not the favourite to triumph at Roland Garros, he hoped to replicate his performance at the year's opening grand slam in order to give himself a chance.

"I just enjoyed all my tennis career to be where I am, and I always feel very privileged and lucky to have the chance to enjoy all the experiences that I am enjoying and I am living because of this sport," Nadal said.

"And here I am in Roland Garros, another year. It is a place I know well. It is a place that I consider the most important one in my tennis career, without a doubt, and with a lot of positive memories.

"Today, it looks difficult and there are players that are in better shape than me, without a doubt, that is true today. But you never know what can happen in the next couple of days.

"The same happened in Australia, and I put myself in a position to have a chance, and here is no different. Things can change quick, and the only thing that I can do is try to be ready if that change happens."

Pressed on the effects of the foot injury which troubled him in Rome, Nadal said he is feeling better, but maintained it was a case of managing, rather than curing, the pain.

"What happened in Rome is something that happened very often in my practices," he added. "I was suffering after that for a couple of days, but I feel better.

"The pain is there always. It's not going to disappear now. It's about if the pain is high and strong enough to allow me to play with real chances [of winning] or not.

"But in my case, is something that I live every day, so it's nothing new for me and is not a big surprise. 

"I am here just to play tennis and to try to make the best result possible here in Roland Garros. And if I didn't believe that this thing can happen, probably I would not be here."

Meanwhile, the stars appear to have aligned for Nadal, with his beloved Real Madrid facing Liverpool in the Champions League final on May 28 just a short journey across Paris at the Stade de France.

Nadal, a known supporter of Los Blancos who requested not to play at the same time as their semi-final win over Manchester City while competing at the Madrid Open earlier this month, revealed he has already made plans to attend the conveniently located contest. 

"Well, I am here to play Roland Garros more than anything else. But of course, I have my tickets already," he smiled.

No ranking points will be awarded at Wimbledon this year due to the ban on Russian and Belarusian players, the ATP confirmed on Friday. 

The All England Club announced the blanket ban last April following Russia's invasion of Ukraine. In its statement, it said the championships had a responsibility to help "limit Russia's global influence through the strongest means possible". 

Russian and Belarusian players have been allowed to continue playing under a neutral flag, with the Tour saying Wimbledon's decision not to accept their entries was "unfair" and had "the potential to set a damaging precedent for the game". 

The governing body for men's tennis has now decided that no ranking points will be on offer at SW19 unless the All England Club lifts the ban. There was no concurrent announcement from the WTA.

A statement from the Tour read: "The ability for players of any nationality to enter tournaments based on merit, and without discrimination, is fundamental to our Tour. 

"The decision by Wimbledon to ban Russian and Belarusian players from competing in the UK this summer undermines this principle and the integrity of the ATP ranking system. It is also inconsistent with our rankings agreement. 

"Absent a change in circumstances, it is with great regret and reluctance that we see no option but to remove ATP ranking points from Wimbledon for 2022. 

"Our rules and agreements exist in order to protect the rights of players as a whole. Unilateral decisions of this nature, if unaddressed, set a damaging precedent for the rest of the Tour. Discrimination by individual tournaments is simply not viable on a Tour that operates in more than 30 countries. 

"We greatly value our long-standing relationships with Wimbledon and the LTA [Lawn Tennis Association] and do not underestimate the difficult decisions faced in responding to recent UK government guidance. 

"However, we note that this was informal guidance, not a mandate, which offered an alternative option that would have left the decision in the hands of individual players competing as neutral athletes through a signed declaration. Our internal discussions with affected players in fact led us to conclude this would have been a more agreeable option for the Tour. 

"We remain hopeful of further discussions with Wimbledon leading to an acceptable outcome for all concerned. More broadly, we believe this matter again highlights the need for a united governance structure across professional tennis so that decisions of this nature can be made in a joint manner." 

The statement added: "Our condemnation of Russia's devastating invasion of Ukraine remains unequivocal. Immediate action was taken to suspend the ATP Tour event in Moscow and have Russian and Belarusian athletes compete under neutral flags on Tour. 

"In parallel, we have continued our humanitarian support for Ukraine, together with the other governing bodies of tennis, as well as providing direct financial assistance to many affected players." 

Naomi Osaka is preparing for a difficult return to the French Open, a year on from citing mental health issues when she withdrew from the tournament.

Former world number one Osaka has won four grand slam titles but never been past the third round at Roland Garros.

She entered the 2021 French Open having taken the Australian Open title at the start of the year, only for her campaign in Paris to blow up in a way she was desperate to avoid after she announced she would not be fulfilling her media duties.

Having been fined, Osaka ultimately quit the tournament after winning in the first round, describing her "huge waves of anxiety" when speaking to reporters.

She had been warned by grand slam chiefs that she could be thrown out of the event if she continued to refuse to take part in media duties.

The Japanese superstar took a significant step on Friday then when she appeared in a pre-tournament news conference.

Yet that has not been Osaka's only concern, as she is also conscious of the possibility of a repeat of events at Indian Wells earlier this year, where a heckler reduced her to tears.

"I'm not gonna lie," Osaka said, "when I first came here, I was very worried.

"Of course, I also didn't like how I handled the situation, but I was worried that there were people that I offended some way and I would bump into them.

"But I think everyone has been really positive, for the most part. I'm not really so sure.

"I was also very worried about this press conference, because I knew I'd get a lot of questions about this. But I think, for me, where I am right now, I wouldn't want to say it hasn't left my mind.

"Of course, I'm still thinking about it, and I'm kind of also prepping just in case I go on the court and a fan says something like in Indian Wells. For the most part, I think I'm okay."

Osaka was then asked how she had found the news conference and explained she was still figuring out how to talk to reporters again.

"I feel like I was funnier back then," she replied with a smile. "Like I used to be able to say jokes and not really care if anyone got it. I could re-explain the joke, and whatever.

"I feel like the thing that's changed, me trying to figure out the crowd. I feel like I'm a stand-up comedian, and I'm trying to figure out what's okay and what's not okay.

"I think maybe that's changed for me. I'm kind of analysing what I can say and what I can't say. But for the most part, I try to be myself and whatever."

Attention turned to tennis, and Osaka's first-round match is against Amanda Anisimova, who beat her in her previous grand slam match in Melbourne.

"So, my reaction was I thought that Wim [Fissette, her coach] was joking," Osaka said.

But she added: "I wouldn't say I don't want to play her, because I feel like, for me, I'm the type of person that if you beat me, it motivates me more to win, and I also learned a lot from the match."

Indeed, Anisimova was not the opponent the unseeded Osaka feared most, with 2020 champion and current number one Iga Swiatek having won her past five tournaments.

"I had a dream a couple of days ago that the draw came out, and I had to play Iga," Osaka said.

"For me, I was scared, because I was thinking: what's the worst possible player to play when I'm unseeded? She came in my mind, so thank God that didn't happen."

Daniil Medvedev remains dismayed by the prospect of missing Wimbledon but has ruled out taking the All England Club to court in a bid to overturn the ban on Russian players.

The US Open champion is in Paris for the French Open, which is allowing players from Russia and Belarus to compete.

Stars from those countries have been denied entry to Wimbledon next month, however, due to the Russian-led invasion of Ukraine.

They will not be allowed to play any events in England, the Lawn Tennis Association said, but Medvedev is determined to play a grass-court season and has signed up for tournaments in Netherlands and Germany already, while considering another in Spain.

The 26-year-old from Moscow has expressed hope that there could yet be a way for him into the Wimbledon draw, and stuck by that position on Friday.

"I'm not in the ATP taking the decisions, I'm not in Wimbledon taking the decisions. Maybe it's government pushing them, maybe it's their decision. There a lot of mistakes behind this," Medvedev told a news conference at Roland Garros.

"So if I can play I'm going to be happy to play. I love Wimbledon as a tournament. I honestly tend to think I like playing on grass, though I didn't have amazing results so far, but I managed to win one tournament. But if I cannot play, I'm going to try to play next year's and try to play good there."

Asked whether he would consider recourse to the Court of Arbitration for Sport, Medvedev said: "Personally, I didn't think about this."

He suspects there might be a case to be made, but added: "I'm not going to go to court for this one."

Court action might not be considered a good look, given the circumstances, so Medvedev looks like having to settle for playing the satellite ATP Tour events around the grass-court showpiece.

"Usually I like playing grass. I want to make some good results," he said. "Halle is a really strong tournament and if you manage to win it, it's a great result and gives you a lot of confidence no matter for the next tournaments if it's grand slams or not, or if it's Masters 1000.

"So I'm planning to play three grass-court events, which is 's-Hertogenbosch, Halle, and I'm thinking to go to Mallorca."

Medvedev, who has spent time sidelined by hernia trouble recently, will face Facundo Bagnis in the first round in Paris.

Novak Djokovic is banking on experience being a telling factor after the defending champion was handed a daunting draw at the French Open.

To reach another final, Djokovic may have to get past 13-time champion Rafael Nadal in the last eight and in-form teenager Carlos Alcaraz in the semi-finals.

Djokovic described Alcaraz's rise to prominence as "a quantum leap", with the 19-year-old from Murcia having hurtled from 32nd in the world rankings at the start of the year to number six now.

Ahead of 35th birthday celebrations on Sunday, Djokovic is relieved to be back at a grand slam after being deported from Australia in January due to his stance on COVID-19 vaccinations.

He was also prevented from playing the Masters 1000 tournaments in Indian Wells and Miami, meaning his season has been heavily disrupted.

Ahead of a first-round clash with Yoshihito Nishioka in Paris, Djokovic can be seen to be in good physical shape and strong form, having won the Internazionali d'Italia title in Rome last week for a sixth time.

The bunching of Nadal, Djokovic and Alcaraz, widely considered the three most likely winners, in one side of the draw, caused a stir on Thursday.

Speaking 24 hours later, Djokovic described it as "a very tough top half", before assessing the qualities of Nadal, who has been battling injuries recently, and the fast-rising Alcaraz.

"Nadal always has to be right at the top, because of his records particularly in this tournament," Djokovic told a news conference.

"Then you have Alcaraz that obviously is the story of men's tennis in the last four or five months with a big reason. He's had some tremendous leaps forward on rankings and the results that he's been achieving are phenomenal for someone of his age."

Alcaraz has won a tour-leading four titles in 2022, including Masters 1000 events in Miami and Madrid, and Djokovic said: "He has made a quantum jump really forward in the last five, six months."

Djokovic and Alcaraz practised together on Friday on Court Philippe Chatrier, where they could be battling it out for real in two weeks' time.

The Serbian, one behind Nadal's record of 21 grand slam titles, added: "I feel I am always in that contention to fight for any grand slam trophy. I believe in my own abilities to get far and to fight for one of the most prestigious trophies in the world of tennis.

"As a defending champion of course more so, to believe I can do it again. Reliving the memories from last year is something that obviously gives me goose bumps and motivation to try to replicate that.

"I think that experience of being on the tour for such a long time helps [me] to know how to spend energy on the court match after match, bring out the right intensity, manage everything that happens off the court, as well, and peak at the right time."

Alcaraz has achieved all his title success in best-of-three tennis so far, so winning over the longer distance in a slam is the next challenge. This is where Djokovic has arguably been at his strongest.

"In best-of-five, obviously things are different," Djokovic said. "A grand slam I think awakens so much motivation and emotions in a tennis player.

"It's the dream of many tennis players to win a grand slam. That's why you cannot underestimate anyone and probably not compare the performances of those players on any other tournament with the potential performance here in a slam."

Roger Federer hopes to replicate fellow tennis great Rafael Nadal's "incredibly inspiring" recovery from injury when he makes his own comeback from knee surgery.

Nadal suffered from a recurring foot problem last season but returned to secure a record 21st grand slam title at the Australian Open in January, moving ahead of Federer and Novak Djokovic in the men's all-time list.

Federer has been out of action since losing in the Wimbledon quarter-finals last year, where he sustained another problem with his knee and subsequently underwent a third surgery in the space of 18 months.

The Swiss is yet to put a timeframe on his full ATP Tour return, although he is scheduled to play at the Laver Cup in September before playing the Swiss Indoors Basel event in his home city in October.

Federer, who turns 41 in August, referenced Nadal as he expressed his hopes to emulate the Spaniard's 20-match winning streak that he embarked on when returning from injury this season.

"It's incredibly inspiring when someone comes back from massive health problems," Federer told Caminada Magazin.

"Rafa and I talk on the phone from time to time, we talk a lot. I knew he wasn't doing great, but when he made it I was really happy for him. The effort is immense."

As for Federer's recovery, the world number 46 detailed the struggles he has to go through just to make it onto the court.

"As with a car, you have to turn a thousand screws until the engine runs smoothly," he added. "Today, mobilisation, stretching, and a warm-up in the morning take about 45 minutes. Then we drive to the plant. There follows a warm-up on the pitch, half an hour. 

"After that I eat, stretch, strengthen my ankles with tapes, then warm up again, do gymnastics and explosive speed exercises. Before I finally play, I took care of my body for two and a half hours.

"I don't post many pictures of the strenuous training because I was always convinced that it was a matter of course. Everyone trains hard. 

"I swore to myself that by the end of my career I wouldn't be completely broken. Later I would like to go skiing with the children and play football with my colleagues. That's why I'm doing rehab now – not just for tennis. Also for life after your career."

Asked when he will make his comeback, Federer added: "I can't even think that far. I'm waiting for the doctors' okay. I'm ready to give it my all again. 

"I feel like a racehorse scratching its stall and wanting to race. In the summer I hope to be able to hit the ground running. 

"I'm looking forward to coming home in the evening after the tough day of training and being completely exhausted."

World number one Iga Swiatek is heading to Roland Garros in a laid-back mood as she looks to win her second major title.

Swiatek won her first and only grand slam when she triumphed in Paris in 2020 as a teenager.

The 20-year-old – who rose to number one in the WTA rankings when Ash Barty retired in March – has been in sparkling form in 2020.

Having reached the Australian Open semi-finals, Swiatek has gone on to win five successive titles, becoming the fourth player since the turn of the century to manage that feat.

She became the third-youngest player to win her second title in Rome when she triumphed at the Internazionali d'Italia earlier this month, while she has won five of the last nine WTA 1000 titles.

Swiatek was defeated by Maria Sakkari in last year's quarter-finals at Roland Garros, but feels she has little to prove going into the second major of the season.

"I'm more relaxed. I don't know about being nervous, because usually it comes closer to the match, so we will see," Swiatek, who has won her last 28 matches, told a media conference.

"But I'm more relaxed, because I have so many [ranking] points and I feel like my position in the WTA is already like, you know, I have worked for it.

"Already I've kind of proved to myself and to other people that I can be in the top of the game. Before I wasn't feeling that much confidence, so this year I feel much more peace.

"I'm taking the experience of the whole process, and playing seven matches in two weeks, having the routines. Also like getting to know how it is to go higher and higher in a grand slam.

"These kind of experiences help me not only for other grand slams but for many tournaments."

Emma Raducanu declared she "could be a great clay-court player" ahead of her French Open debut at Roland Garros.

US Open winner Raducanu only made her professional clay-court debut in April, managing a straight-sets victory over Storm Sanders in Stuttgart, before quarter-final elimination to world number one Iga Swiatek.

The 19-year-old Briton followed that up with a last-16 appearance in Madrid, where she was defeated by Anhelina Kalinina as she struggled with a back injury.

Raducanu, speaking at a media conference on Friday ahead of the second major of the year, suggested she has the credentials to succeed on clay courts.

"I could be a great clay-court player, like looking forward, long, medium-term, in a few years where I have definitely developed more robustness and I'm able to repeat the same shots over and over," she said.

"I think I have definitely come a long way and probably progressed faster than expected in the last few weeks and I really am enjoying the clay. I really believe that I can be good and faster than I thought it would be."

World number 12 Raducanu retired in Rome last week while trailing against Canadian Bianca Andreescu due to a recurring back issue.

However, she confirmed she will be fit to feature in Paris, where she meets a qualifier in the first round 

"I'm learning about my body, but I'm very happy to be continuing my preparations for the French Open and to be able to play this tournament and fortunately I didn't have to miss this Grand Slam," Raducanu added.

"That is definitely a really positive thing because I really look forward to these big moments and the big tournaments.

"After Rome, I definitely had to slow down, but this week I have been training and luckily being able to practise all of the shots.

"I'm looking forward to continuing that, and it feels good to be able to move freely and just like run around. It's quite fun. I have been preparing as normal the last few days."

If Raducanu can negotiate past her first-round clash, she will then take on Aliaksandra Sasnovich or Wang Xinyu before a potential last-16 meeting with Ons Jabeur, who first has to get past Poland's Magda Linette.

Casper Rudd set up a semi-final clash with Reilly Opelka by claiming a straight-sets win over Thanasi Kokkinakis at the Geneva Open, while Cameron Norrie made his third semi-final of 2022 at the Lyon Open.

World number eight Rudd, who claimed the title in Geneva last year with a straight-sets final win over Denis Shapovalov, overcame Kokkinakis 6-4 7-6 (7-3) on Thursday and will now face Opelka.

The American bounced back from losing the second set against Dutchman Tallon Griekspoor to claim a 6-4 3-6 6-3 win as he bids for his third title of 2022, and second seed Ruud said he was excited to pit himself against Opelka after securing his spot in the semi-finals.

"I expect it to be tough," Ruud said. "But I will do my best and see how I can do. I always enjoy playing against Reilly. He is a similar age to myself, and it will be another battle against him – hopefully it will be a good one."

Elsewhere, three-time grand slam semi-finalist Richard Gasquet followed up his shock win over Daniil Medvedev with a 6-2 6-4 victory over Kamil Majchrzak, and will face Joao Sousa for a place in the final after the Portuguese beat Ilya Ivashka 7-5 7-5.

At the Lyon Open, top seed Norrie battled to a 6-4 4-6 7-5 win over Sebastian Baez, spurning three match points before finally downing the Argentinian after a marathon two hours and 40 minutes clash.

The world number 11 will face Holger Rune in his semi-final contest after the 19-year-old came from a set down to beat Manuel Guinard 3-6 6-3 6-4.

The other semi-final in France will see fourth seed Alex de Minaur take on Alex Molcan after the Australian's quarter-final opponent Yosuke Watanuki withdrew after losing the first set 6-4, citing a back issue.

Molcan, meanwhile, downed Federico Coria 6-3 6-2 to reach the final four.

Angelique Kerber defeated Magda Linette in three sets at the Internationaux de Strasbourg to reach her first clay-court semi-final since 2016.

World number 22 Kerber rolled back the years with a battling 6-2 4-6 6-4 victory in a time of a little over two hours on Thursday.

She converted four of her nine break points and will now face the unseeded Oceane Dodin, who needed just an hour to overcome Viktorija Golubic 6-3 6-0.

Top seed Karolina Pliskova continued her progression with a 6-4 7-6 (8-6) victory over Maryna Zanevska, meanwhile, and will take on Kaja Juvan for a place in the final after she beat fourth seed Elise Mertens 7-6 (7-3) 6-4.

Pliskova, who saved four set points in the tie-break, is aiming to become the fourth Czech champion in Strasbourg.

At the Grand Prix Sar La Princesse Lalla Meryem, Anna Bondar is the last seed standing after opponent Ajla Tomljanovic retired injured when 5-1 down in the opener.

Clair Liu saw off Astra Sharma 6-4 6-1 to reach the semi-finals in Morocco, while Lucia Bronzetti and Martina Trevisan will meet in the other final-four showdown.

Bronzetti outlasted third seed Nuria Parrizas-Diaz 6-1 3-6 7-6 (7-5) while Liu beat Astra Sharma 6-4 6-1.

Novak Djokovic, Rafael Nadal and Carlos Alcaraz are all on the same half of the draw at the French Open, while women's world number one Iga Swiatek will face a qualifier in the first round at Roland Garros.

Djokovic, who will make his Grand Slam return having missed the Australian Open, opens in Paris against Yoshihito Nishioka, while record 21-time grand slam winner Nadal meets Australia's Jordan Thompson.

The veteran pair of Djokovic and Nadal could challenge each other in the quarter-finals in the top half of the draw, where Alcaraz could come across world number three Alexander Zverev.

Alcaraz faces a qualifier in the first round and has won 16 of his last 17 matches, with the one blemish on his remarkable run coming against Sebastian Korda, who the Spaniard could meet in the third round.

Daniil Medvedev will have to get past Argentine Facundo Bagnis in the first round, while Lorenzo Musetti stands in the way of last year's runner-up Stefanos Tsitsipas.

Medvedev and Tsitsipas are joined in the wide-open bottom half of the draw by Casper Ruud and Andrey Rublev, who meet home favourite Jo-Wilfried Tsonga and South Korea's Soonwoo Kwon respectively.

In the women's draw, 2020 champion Swiatek comes in as favourite and will look to continue her 28-match winning streak when she faces a qualifier in the first round, as does US Open winner Emma Raducanu.

The Brit will then take on Aliaksandra Sasnovich or Wang Xinyu before a potential last-16 meeting with Ons Jabeur, who first has to get past Poland's Magda Linette.

Meanwhile, Karolina Pliskova – who has a first-round clash with France's Tessah Andrianjafitrimo – could set up a quarter-final meeting with Swiatek, but the Pole may have to get past Simona Halep in the fourth round first.

Defending champion Barbora Krejcikova starts against Diane Parry, while Naomi Osaka was drawn against the in-form Amanda Anisimova, who beat the Japanese in the third round of the Australian Open.

Reigning champion Casper Ruud made a winning start to his Geneva Open title defence after defeating Benoit Paire in straight sets on Wednesday.

The world number eight triumphed in Switzerland 12 months ago with victory over Denis Shapovalov in the final, claiming the first of five ATP titles he won during an impressive campaign.

Fresh from reaching the semi-finals in Rome, the Norwegian – also a winner in Buenos Aires and a Miami runner-up this season – made a dominant start.

Although he was broken in game three of the opening set, Ruud responded immediately and a further four breaks wrapped up a commanding 6-3 6-1 victory in just 55 minutes.

Meanwhile, Reilly Opelka registered his first win on European clay this season as he saw off Christopher O'Connell.

Despite triumphing in Dallas and Houston earlier this year, Opelka has suffered first-round exits in Munich, Madrid and Rome since the latter. 

Nevertheless, the fourth seed was in fine form in Geneva, hitting 13 aces on the way to defeating the Australian qualifier.

However, there was no joy for 2021 runner-up Shapovalov as the third seed crashed out 6-4 6-7(2) 6-3 to Ilya Ivashka.

Fifth seed Nikoloz Basilashvili fell 6-4 6-3 at the hands of 2015 finalist Joao Sousa, who progresses beyond round two for the first time since reaching the Championship match seven years ago.

There were more surprise defeats in Lyon, where second seed Pablo Carreno Busta was beaten 7-5 6-3 by Federico Coria.

After taking a close opening set, the world number 59 rallied from 3-1 down in the second to reach his fourth quarter-final of the season on clay.

Karen Khachanov also bowed out to Marrakech runner-up Alex Molcan 6-2 7-6(4), while Munich champion Holger Rune built on his momentum with a 6-4 6-3 victory over Adrian Mannarino.

Karolina Pliskova reached her maiden quarter-final of the season after battling past Bernarda Para in Strasbourg 6-3 1-6 6-1.

Runner-up to Ash Barty at Wimbledon last July, Pliskova has endured a stop-start 2022 campaign.

The Czech missed the first two months with a hand injury, while suffering first-round exits in Indian Wells, Miami and Madrid.

But despite being taken to a decider by her French opponent, the top seed hit 16 aces on the way to reaching the last eight.

Second seed Angelique Kerber also required a deciding set to progress to her first quarter-final of the campaign; the three-time Grand Slam winner overcoming Aliaksandra Sasnovich 6-2 3-6 6-4.

Fourth and ninth seeds Elise Mertens and Viktorija Golubic also advanced to the last eight following straight-set wins over Anna-Lena Friedsam and Fiona Ferro respectively.

However, there was no joy for top seed Garbine Muguruza over in Rabat; the two-time Grand Slam champion was beaten 2-6 6-4 6-1 by world number 85 Martina Trevisan.

The Italian's reward is a quarter-final showdown with seventh seed Arantxa Rus, who saw off Dalma Galfi 6-4 6-2.

Mayar Sherif was another seed to tumble; the Karlsruhe champion lost 4-6 7-6(5) 6-1 to Claire Liu, who triumphed in the Trophee Lagardere last week.

Third seed Nuria Parrizas Diaz recovered from losing the opening set to defeat Kristina Mladenovic 4-6 6-3 6-0, while Anna Bondar hit seven aces as she overcame Kristina Kucova 6-3 6-3. 

Golf's world number two, Jon Rahm, believes teenage compatriot Carlos Alcaraz can benefit from having Rafael Nadal around as his burgeoning tennis career progresses.

Nineteen-year-old Spaniard Alcaraz became the first tennis player to beat both Nadal and Novak Djokovic in the same tournament on clay, on his way to becoming the youngest ever winner at the Madrid Open earlier in May.

Alcaraz has won three of the past four tournaments he has entered, including the Miami Open, moving to number six in the ATP world rankings and emerging as a serious challenger for the French Open, which starts on Sunday.

When asked about Alcaraz's rapid ascent, Rahm said Alcaraz can still learn a lot from 21-time grand slam winner Nadal.

"I thought you were talking about a golfer. I was just confused," Rahm joked, speaking ahead of this week's US PGA Championship. "I've heard about what he's done, and I've seen the results. Pretty impressive, especially in the world of tennis.

"He's got some big shoes to fill, because historically Spain has had great tennis players, and obviously with Rafa out there it can be probably daunting yet really exciting too for somebody like him.

"You have a great reference who's done it right in front of you, so I'm sure he can pick his brain and learn. He's got a great start. Hopefully he can keep it going and be a great champion like many others have been."

Following a tie for 27th at the Masters, Rahm returned to action earlier in May, winning the Mexico Open.

The lingering dynamic this weekend at Southern Hills will be the fact Phil Mickelson will not be there to defend his title, following his controversial remarks about the Saudi-backed breakaway golf tour.

Rahm and Mickelson share the same alma mater and agency, and the former continued to defend the six-time major winner.

"Phil has got to do what Phil has got to do," Rahm said. "He's a good friend of mine. I can't remember the last time a major champion didn't defend a title.

"But he's got to do what's best for him. That's all I can say. I can't say it makes me unhappy. As long as he's doing what is best for him, I can't truly say I'm unhappy.

"I would have liked to see him defend. I know he's played good here in the past. But again, he's got to do what he's got to do."

Ajla Tomljanovic reached the quarter-finals of the Grand Prix Sar La Princesse Lalla Meryem in Rabat, while Sorana Cirstea crashed out in Strasbourg.

Second seed Tomljanovic was a 7-5 6-2 victor against Anna Karolina Schmiedlova, reeling off the last four games in succession to advance in Morocco.

Fellow Australian Astra Sharma joined her in the last eight by overcoming wildcard Petra Marcinko 5-7 6-3 6-3.

Kristina Mladenovic had to save a match point after passing up two herself to finally get over the line with a 6-3 3-6 7-6 (9-7) success - her first singles win of the year - over lucky loser Tessah Andrianjafitrimo in a first-round clash.

At the Internationaux de Strasbourg, third seed Cirstea stormed to a one-set advantage against Ekaterina Makarova but soon fell away and succumbed to a 1-6 6-3 6-2 loss. 

Magda Linette breezed past Heather Watson 6-1 6-1 to reach the quarter-finals, where she was joined by Maryna Zanevska after the Belgian's 4-6 7-5 6-1 comeback win against Harmony Tan. 

Top seed Karolina Pliskova awaits American Bernarda Pera who defeated Elena-Gabriela Ruse in straight sets, while Anna-Lena Friedsam will take on Elise Mertens after rallying to beat Daria Saville 4-6 6-3 7-6 (7-5).