Billie Jean King insists Martina Navratilova is "as brave as she is strong" after the latter was diagnosed with throat and breast cancer.

Navratilova is one of the most decorated players of all time, having won 18 grand slam titles during a glittering career.

The 66-year-old underwent successful treatment for breast cancer in 2010, but it has now been confirmed she is battling the illness again.

Navratilova said the diagnosis is "serious but still fixable," while a representative confirmed she will start treatment later this month and subsequently not attend the Australian Open.

King, a 12-time major winner, offered her support.

"Martina is as brave as she is strong," the 79-year-old tweeted.

"She has fought this battle before, and she is in our thoughts and prayers."

Tennis great Billie Jean King believes it is "important" for people to go to the World Cup in Qatar and "be an influencer" amid ongoing concerns over the country's human rights record.   FIFA's decision to allow Qatar to host the World Cup has faced persistent criticism, with concerns cited over the human rights standards in a country where same-sex relationships are prohibited.   England captain Harry Kane will be among eight skippers to wear a distinctive heart-adorned armband at the tournament, raising awareness for the OneLove campaign against discrimination   King has been a regular promoter of equality, helping to secure equal prize money at tennis' four majors, and outlined her support for Qatar, where she would not be against hosting the WTA's Billie Jean Cup.   "I probably would be because, first of all, the WTA went there years ago," the 78-year-old responded when asked if she would allow her tournament's finals to be held by the World Cup hosts.   "I get a lot of different people coming to me saying 'why would you play there the way they treat women?' But personally, I think it's important to show up and be an influencer.   "I think it's delicate, no question. But I think it's important to go if you get the opportunity and everything else fits too, not just go there for money or whatever."

Qatar faced more scrutiny after an Amnesty International report in 2021 alleged thousands of migrant workers were exploited, with the country's government denying those claims but acknowledging problems.

King is no stranger to the Middle East either, having supported the WTA Finals being played in Doha, where she said the tournament created opportunities for female tennis players.

"We were there four or five years and I think it helped," the American added. "When I went there I did a clinic for the kids but only for the girls.

"Somebody was left-handed, which is sinister to them, and this mother was saying she hoped her left-handed daughter could one day become a champion and get rid of that stigma.

"These are the kind of discussions you can have when you're physically there. So I'm big on going actually, even if I know it's a fine line of how you do it."

The World Cup starts in 18 days when Qatar face Ecuador at Al Bayt Stadium, Al Khor.

Billie Jean King has described Roger Federer as a "champion's champion" after the Swiss maestro announced his retirement from tennis.

Having not played competitively since Wimbledon 2021, Federer revealed on Thursday he had taken the "bittersweet decision" to retire.

After being beset by injuries in recent years, Federer declared: "I've worked hard to return to full competitive form. But I also know my body's capacities and limits, and its message to me lately has been clear."

Federer will make a farewell appearance at the Laver Cup in London next week, partnering with fellow greats Rafael Nadal and Novak Djokovic for Team Europe.

The 41-year-old will end his career with 20 grand slam singles titles, a tally only bettered by Nadal (22) and Djokovic (21) in the men's game, but King believes he was the most complete player of the modern era.

"Roger Federer is a champion's champion," King, herself the winner of eight Open-era major singles titles, wrote on Twitter.

"He has the most complete game of his generation and captured the hearts of sports fans around the world with an amazing quickness on the court and a powerful tennis mind. 

"He has had a historic career with memories that will live on and on.

"Congratulations @rogerfederer, we wish you the very best as your journey continues."

Serena Williams will go out with "full force" when she begins her final US Open campaign before retiring, according to Chris Evert.

Williams will have one last chance to match Margaret Court's all-time record of 24 grand slam singles titles at Flushing Meadows, as well as an opportunity to wave goodbye to her adoring fans on home soil.

While a challenge for the trophy looks highly improbable for Williams this time around, fellow six-time US Open winner Evert suspects the 40-year-old will take some shifting from the draw.

According to Evert, "the edge is off" when it comes to Williams and her remaining tennis goals, meaning she has reconciled herself to the likelihood of finishing her career with 23 singles majors.

Williams has revealed family matters and business interests were key to her decision to "evolve away" from the sport, and with her on-court returns diminishing, now seems the time to head in that direction.

Yet Evert can see Williams, who faces Danka Kovinic in round one in New York, giving a good account of herself during her US Open swansong.

"Serena isn't coming out to play her last match; she's coming out with full force," Evert said on ESPN. 

"The way she's been practising this week, she's here to compete, she's here to win, and I don't even think she's thinking about retirement at this stage."

Williams holds a 106-14 win-loss record in singles at the US Open. Her match wins tally at Flushing Meadows is the highest by any woman at the competition in the Open Era, and only Martina Navratilova has more at a single slam, achieving an astonishing 120 victories at Wimbledon.

Williams and Evert lead the way in women's US Open titles in the professional era (since 1968), and regardless of final grand slam tallies, there will always be debate over who ranks as the greatest player of all time.

Williams certainly has a strong case, yet Navratilova (1,442), Evert (1,309) and Steffi Graf (900) all won more WTA-level matches than Williams (856), who often played a limited schedule.

Court has the most grand slam titles on the women's all-time list, with a remarkable haul of 64 when women's doubles and mixed doubles are included. Navratilova is next with 59, before Williams and Billie Jean King sit joint third with 39 majors apiece.

Scheduling self-preservation has allowed Williams to play on for so long, and John McEnroe has raised the question of what might happen if his fellow American surprises herself by clinching a seventh Flushing Meadows triumph. 

"If she did happen to win this, don't you think it'd be tempting to go and break the record?" McEnroe asked.

Four-time US Open singles champion McEnroe added: "I think she's accepting, as much as Serena Williams can, that she's not going to win this.

"Maybe deep down she's found some sort of belief that maybe somehow, if she gets the right set of situations going, she can make a real run."

More realistic, in McEnroe's mind, is the prospect of Williams and sister Venus having a deep run in the doubles after they were handed a wildcard.

As a partnership, the siblings have won 14 grand slam doubles titles, never losing in a final at the majors.

"The two of them in doubles, where they're covering half the court and they're still able to do their thing, that would be a hell of a way to go out," McEnroe said.

Martina Navratilova said she was "gutted" to miss Wimbledon's Centre Court centenary celebration after testing positive for COVID-19 on Sunday.

The nine-time champion was absent from a parade of champions, and in a series of posts on social media she explained why she had to sit it out.

Past winners were introduced to the main show court's middle Sunday crowd, with the one-time champions going first, all the way through to eight-time Wimbledon king Roger Federer.

Navratilova would have come out last of all, as the most successful singles player in Wimbledon history, but she was unable to take part. Including doubles, Navratilova won 20 slam titles at Wimbledon.

"Unfortunately I will miss it as I just tested positive this morning," she wrote on Twitter shortly before the ceremony. "Am so bummed!!!! I am gutted I can't be there."

Confirming she had the coronavirus, Navratilova wrote: "Yup, got it here for sure… oh well. So wanted to be on that court with so many champions of our sport."

Asked how she was feeling, the 65-year-old Czech-born American added: "Not too bad so far- wouldn't want to play tennis but ok… fingers crossed."

A host of greats of the game delighted the crowd, with stars of the women's tour including Navratilova's former great rivals Chris Evert and Billie Jean King, along with Margaret Court and Venus Williams, while Federer was joined by a field of fellow men's superstars that included Rod Laver, Novak Djokovic, Stefan Edberg, Rafael Nadal and Andy Murray.

Three-time former champion Boris Becker was another notable absentee, after the German was jailed in April for offences relating to his 2017 bankruptcy. Seven-time winner Serena Williams also missed the event, after her first-round defeat.

Navratilova has been working at Wimbledon during the championships, notably appearing as a member of the BBC broadcast team.

Roger Federer's coach called for Court Philippe-Chatrier to be named after Rafael Nadal and Real Madrid paid tribute to the legendary Spaniard after he won a staggering 14th French Open title.

Nadal produced yet another masterclass at Roland Garros, beating Casper Ruud 6-3 6-3 6-0 to secure a record-extending 22nd grand slam title on Sunday.

There have been concerns the 36-year-old may be forced to retire due to a foot injury, but one of the all-time greats vowed to fight on after completing the Australian Open and Roland Garros double in the same year for the first time.

Nadal was imperious as he moved two clear of Federer and Novak Djokovic's haul of major crowns.

The 'King of Clay' has won an astonishing 112 French Open matches and suffered only three defeats in one of the most astonishing sporting dominances.

Ivan Ljubicic, Federer's coach, called for the main show court at Roland Garros to be named after Nadal.

He tweeted: "Not many PLAYED 14 @rolandgarros tournaments. He won it 14 times. There is no word to describe this feat. Don't think good old Philippe would mind if his court changes the name to Rafael Nadal - statue is not enough."

Billie Jean King says it is time for female tennis players to stop being treated like "second-class citizens" and backed Amelie Mauresmo to redress the balance at the French Open.

Mauresmo apologised after this week stating that there had only been one women's match at Roland Garros played in the night session as the men's game is more appealing.

Iga Swiatek, who won her second grand slam title in Paris on Saturday, described the French Open tournament director's comments as "disappointing and surprising".

The legendary King has called for female players to be in the spotlight more and expects that to be the case on Court Philippe-Chatrier next year, when Mauresmo will oversee the clay-court major for a second time after a difficult start to her tenure.

"You've got to put them when it's prime time, and you have got to figure it out and you want to give equal opportunity to both genders," King said during a press conference at Roland Garros.

"Always. You always want to make sure you do the right thing by each person. They should have the same amount of women's matches as they do men's. Real easy.

"Right now we are playing two out of three sets, we will get out of there faster.

"I think the men should change that. If we keep treating us like second-class citizens we will stay second-class citizens. You want to make everyone feel important

"We should have more matches, but I think Amelie will take care of that next year. Knowing her, she's a winner."

World number one Swiatek swept 18-year-old Coco Gauff aside to lift the Coupe Suzanne Lenglen for a second time on Saturday, winning 6-1 6-3 to extend her astonishing run of victories to 35.

Coco Gauff cited LeBron James, Serena Williams, Colin Kaepernick and Naomi Osaka as her inspirations after the tennis star wrote "Peace, end gun violence" on a camera at the French Open.

The 18-year-old overcame Martina Trevisan in the semi-final at Roland Garros with ease, recording a 6-3 6-1 victory to book her maiden single's grand slam final appearance.

That made the world number 23 the youngest American female finalist in Paris since Monica Seles in 1991 and the youngest overall since Kim Clijsters in 2001.

Gauff has not dropped a set en route to the final, where she faces the in-form Iga Swiatek on Saturday, but much of her post-match focus was on the ongoings back in the United States.

The USA is still reeling from a school shooting in Uvalde, Texas just over a week ago in which 19 children and two teachers were killed.

In the wake of the tragedy, multiple high-profile sportspeople, including Golden State Warriors coach Steve Kerr, have called for changes to gun laws in the USA, and Gauff joined that list on Thursday.

"It's important, just as a person in the world, regardless of tennis player or not," the teenage tennis star said. "I think for me it was just especially important just being in Europe and being where I know people globally around the world are for sure watching.

"I think that this is a problem in other parts of the world, but especially in America it's a problem that's, frankly, been happening over some years but obviously now it's getting more attention.

"But it's been an issue for years. For me, it's kind of close to home. I had some friends that were a part of the Parkland shooting [in 2018].

"I remember watching that whole experience like pretty much firsthand, seeing and having friends go through that whole experience. Luckily they were able to make it out of it. I just think it's crazy, I think I was maybe 14 or 13 when that happened, and still nothing has changed.

"I think that was just a message for the people back at home to watch and for people who are all around the world to watch. I know that it's probably not [going to] – hopefully it gets into the heads of people in office to change things."

Gauff suggested her post-match scribble on the television camera was not pre-meditated and instead came after seeing reports of four people being shot by a gunman in an Oklahoma hospital on Wednesday.

"I really didn't know what I was going to write even moments walking to the camera, and it just felt right in that moment and to write that," she added. "I woke up this morning and I saw there was another shooting, and I think it's just crazy.

"I know that it's getting more attention now. I definitely think there needs to be some reform put into place. I think now especially being 18 I've really been trying to educate myself around certain situations, because now I have the right to vote and I want to use that wisely."

Gauff joins a long list of athletes that are proactively using their platform and audiences to speak on matters they feel passionately about.

As for her inspirations, Gauff listed the likes of NBA star James, fellow tennis players Williams and Osaka, and NFL's Kaepernick, who popularised taking the knee to stand against police brutality and racism.

"I would say LeBron James, Serena, Billie Jean, Colin, the list goes on, Naomi, it goes on really about those issues," Gauff continued. "I think now athletes are more fine with speaking out about stuff like this.

"I feel like a lot of times we're put in a box that people always say, 'Oh, sports and politics should stay separate' and all this. And I say yes, but also at the same time I'm a human first before I'm a tennis player.

"If I'm interested in this, I wouldn't even consider gun violence politics; I think that's just life in general. I don't think that's political at all.

"So of course I'm going to care about these issues and speak out about these issues. When people make those comments, I'm not going to be an athlete forever.

"There is going to be a time when I retire and all this, and I'm still going to be a human. So of course I care about these topics. Sport gives you the platform to maybe make that message reach more people."

Billie Jean King has spoken out against the ban on Russian and Belarusian players imposed at Wimbledon this year as a result of the war in Ukraine. 

The All England Lawn Tennis Club (AELTC) announced on Wednesday that players from the two nations would not be eligible for the grand slam, with the Lawn Tennis Association (LTA) stating it would implement the same rule across all its upcoming tournaments. 

Upon announcing its decision, the AELTC cited a responsibility "to limit Russia's global influence through the strongest means possible". 

The blanket ban rules the likes of Daniil Medvedev, Andrey Rublev, Aryna Sabalenka and Victoria Azarenka out of contention, and that is something King is against. 

She posted on Twitter: "The decision of the LTA and AELTC regarding Russian and Belarusian players at this year's tournament was a difficult and complex undertaking, and I appreciate the challenges and pressures they are facing. 

"One of the guiding principles of the founding of the WTA was that any girl in the world, if she was good enough, would have a place to compete. 

"I stood by that in 1973 and I stand by that today. I cannot support the banning of individual athletes from any tournament, simply because of their nationality. 

"Tennis is stronger when we stand together, and our continue support of the Tennis Plays for Peace initiative, which provides meaningful financial support and resources to Ukraine, needs to be our focus." 

The ATP and WTA criticised the AELTC's decision, while Martina Navratilova and Novak Djokovic have also voiced their opposition. 

In a statement published on Thursday, the Belarusian Tennis Federation (BTF) said it was seeking legal advice. 

"The Belarusian Tennis Federation categorically condemns the decision taken by the organisers of Wimbledon to suspend Belarusian and Russian tennis players. Such destructive actions in no way contribute to the resolution of conflicts, but only incite hatred and intolerance on a national basis," read the release. 

"Throughout the history of tennis, armed conflicts have occurred in the world – in Iran, Afghanistan, Syria, Yugoslavia and other countries – but not until now have tournament organisers suspended athletes from the United States, Great Britain and other countries. 

"Illegal decisions of international tennis organizations in relation to our athletes undermines the reputation of these organisations. 

"Consultations of the BTF leadership with international law firms on sports law are ongoing and a strategy is being developed that is aimed at protecting Belarusian tennis players around the world." 

Naomi Osaka's shock withdrawal from the French Open generated an outpouring of support across the tennis world and beyond. 

The four-time grand slam winner pulled out of Roland Garros on Monday, a day after tournament organisers said her continued refusal to attend mandatory press conferences could result in her being thrown out of the event.

Osaka said in a statement posted to social media that she has had bouts of depression since winning the US Open in 2018 and never intended for her stance to become a distraction. 

Monday's action in Paris had mostly been completed when the news broke, but Serena Williams shared her thoughts following an evening match. 

Williams acknowledged feeling anxious dealing with the press at times early in her career, but said she believed the experience made her stronger. 

Top of mind, however, was concern for Osaka. 

"The only thing I feel is that I feel for Naomi. I feel like I wish I could give her a hug because I know what it's like," Williams said.

"We have different personalities, and people are different. Not everyone is the same. Everyone is different and everyone handles things differently.

"You just have to let her handle it the way she wants to, in the best way she thinks she can, and that's the only thing I can say. I think she's doing the best that she can."

Osaka's fellow players and others took to social media with encouraging messages for the 23-year-old. 

Venus Williams wrote on Instagram: "So proud of you. Take care of yourself and see you back winning soon!"

Young American star Coco Gauff responded to Osaka's tweet by writing "stay strong ... I admire your vulnerability." 

A pair of tennis legends also weighed in on Twitter. 

"I am so sad about Naomi Osaka. I truly hope she will be ok," Martina Navratilova wrote.

"As athletes we are taught to take care of our body, and perhaps the mental and emotional aspect gets short shrift.

"This is about more than doing or not doing a press conference. Good luck Naomi - we are all pulling for you!"

Billie Jean King added: "It’s incredibly brave that Naomi Osaka has revealed her truth about her struggle with depression. Right now, the important thing is that we give her the space and time she needs. We wish her well."

Mardy Fish, the former ATP player who reached number seven in the world, wrote to Osaka: "Mental health is nothing to criticise. Nothing to joke about. Pls [sic] take your mental health seriously. Without my support system, I truly believe I would not be here today. Here for you."

That public show of support extended beyond tennis, as prominent NFL and NBA players praised Osaka for her courage. 

"We are with you," said Seattle Seahawks quarterback Russell Wilson.

NBA star Stephen Curry wrote: "You shouldn't ever have to make a decison like this - but so damn impressive taking the high road when the powers that be don't protect their own. Major respect."

Naomi Osaka's decision to boycott mandatory media interviews at the French Open has left tennis legend Billie Jean King "torn".

Osaka revealed in the build-up to the second grand slam of the year that she would not partake in media duties, stating that "people have no regard for athletes' mental health" during news conferences.

The WTA – organisers of the women's tour – encouraged the Japanese superstar to reach out for support with her mental well-being but stressed she had a "responsibility" to her sport to honour contractual commitments.

The 23-year-old conducted an on-court interview after beating Patricia Maria Tig on Sunday but did not appear at the allotted time for her post-match media conference and was hit with a $15,000 by tournament organisers, who threatened further sanctions, including a possible suspension.

King, a 12-time grand slam singles champion, took to Twitter to outline her stance on what is proving to be a contentious issue.

"I fully admire and respect what Naomi is doing with her platform, so I am a little torn as I try to learn from both sides of the situation," wrote King, a co-founder of the WTA.

"While it's important that everyone has the right to speak their truth, I have always believed that as professional athletes we have a responsibility to make ourselves available to the media.

"In our day, without the press, nobody would have known who we are or what we thought. There is no question they helped build and grow our sport to what it is today.

"I acknowledge things are very different now with social media and everyone having an immediate ability to speak their truth.

"The media still play an important role in telling our story. There is no question that the media needs to respect certain boundaries.

"But at the end of the day it is important that we respect each other and we are in this together."

Osaka plays Ana Bogdan in round two on Wednesday.

Rafael Nadal and Naomi Osaka have earned the top 2021 prizes at the Laureus World Sports Awards, while Patrick Mahomes, Lewis Hamilton and Mohamed Salah were all also recognised.

Tennis dominated the individual honours as Nadal collected a fourth award, named Laureus World Sportsman of the Year for the second time.

The Spaniard, who has also previously taken the 2006 Breakthrough Award and the 2014 Comeback Award, was selected after winning the French Open to tie Roger Federer's record of 20 grand slam titles.

Nadal, who said he "can't be happier", added: "Winning the French Open and equalling the 20th grand slam of Roger Federer has been an unforgettable moment.

"It means a lot to equal my great rival, but at the same time, my great friend. It's something very special after all the history we have had together on and off court."

Laureus World Sportswoman of the Year Osaka, the 2019 Breakthrough winner, claimed a second US Open triumph while supporting the 'Black Lives Matter' movement.

"I think it is important to use my voice, because, for me, I feel like I often hold back a lot and worry about what people think of me, but you know if you have a platform it is very important you use it," the Japanese superstar said.

Kansas City Chiefs quarterback Mahomes won the Super Bowl last year and played in the big game again earlier in 2021, making him the latest Laureus World Breakthrough of the Year Award winner.

He and Formula One great Hamilton both joined Osaka in demonstrations against racial inequality.

Two-time Laureus winner Hamilton got his hands on the Athlete Advocate of the Year Award and said: "This past year has been incredibly difficult for so many, but it has also been heartening to see the power of our collective voices spark new conversations and change.

"The impact of each and every one of you who have stood up, is so inspiring, so I want to thank you. Please keep fighting, keep shining your light."

Liverpool's Salah supported a number of causes and led the Reds to Premier League glory, receiving the Laureus Sporting Inspiration Award, but Bayern Munich of the Bundesliga were the World Team of the Year for the second time.

Nadal and Osaka were not the only tennis stars to have their name called, as Billie Jean King took the Laureus Lifetime Achievement Award.

Russell Westbrook, Doc Rivers and Billie Jean King reacted with revulsion to the assault on the US Capitol by supporters of outgoing president Donald Trump, united in the view there would have been a deadlier outcome had the rioters been black people.

On a dark day for the United States, thousands of Trump backers descended on Washington for a protest rally, refusing to accept the result of November's election that saw Joe Biden sweep to power.

Two weeks out from Biden's inauguration, many violent protesters breached security and accessed the Capitol, causing carnage and destruction as they appeared to go largely unchallenged.

There were a number of casualties, with four dead including a woman who was shot, while reports said a number of explosive devices were discovered.

Washington Wizards star Westbrook said: "It's very unfortunate to see. If those roles were reversed, if those were African-Americans, black people, it would be totally different."

He said the chaos was "just crazy, almost like a movie", and team-mate Bradley Beal agreed it was hard to stomach the scenes, given his view that police took a far less lenient approach to protesters during last year's Black Lives Matter demonstrations.

"It's very disheartening in a lot of ways - a lack of sense of urgency to respond to what was going on, versus protesters at Black Lives Matter over the summer," Beal said.

"The people who were invading our Capitol, that's unheard of and it's disheartening this is where we're at as a country."

Veteran Philadelphia 76ers coach Rivers called the insurgency "pretty disturbing" but vowed that "democracy will prevail".

"It shows a lot, though," Rivers said. "When you saw the [Black Lives Matter] protests in the summer, you saw the riots or more the police and the national guard and the army. And then you see this and you saw nothing.

"It basically proves the point about a privileged life in a lot of ways. I'll say it because I don’t think a lot of people want to: could you imagine today if those were all black people storming the Capitol and what would have happened?

"So that to me is a picture that’s worth a thousand words for all of us to see and probably something for us to reckon with again."

Tennis great King, a long-time activist for equality in sport and society, added on Twitter: "If the rioters storming the Capitol building today were Black and Brown people, the police response would be much different."

Footballer Megan Rapinoe became embroiled in a war of words with Trump during USA's triumph at the 2019 Women's World Cup.

Looking at footage of how seemingly easily the protesters were able to break into the Capitol, Rapinoe offered her opinion, writing: "This is crazy, how did they even get through the..... ohhhhh it was opened for them."

Trump had addressed the crowds earlier in the day, forcefully standing by his view that he was fraudulently robbed of an election win.

In the hours after the Capitol was cleared, Congress confirmed Biden's victory.

Richard Sherman, the San Francisco 49ers cornerback, described the rioters as "terrorists".

He wrote on Twitter: "Never thought Americans would let terrorists into the capital without a fight....sad day. There are certain things my brain could never imagine.... and one of them is black ppl storming a government building and taking things without deadly consequences. But that’s just my brain."

It was not just Sherman's brain thinking along those lines, though. Far from it.

Los Angeles Clippers star Kawhi Leonard took the same stance, saying: "You just see the privilege, the privilege in America. "It's sad to see, because if any of us was out there, I think we would've been tear-gassed, Maced, probably gunshots, you know?"

And American track and field legend Michael Johnson said the scenes were only to be expected, given the nature of the Trump presidency.

"The alarms were sounded for four years. Republicans ignored them. Many in the media ignored them and normalized dangerous behavior," Johnson wrote on Twitter.

"Sadly, today it all came to be. Shameful! This president and his supporters. Shame on you! And take responsibility!

"People on Twitter (of course) literally equating BLM protesters fighting for justice and equality to White Supremacist Trump supporters (supposed Patriots) gleefully and violently desecrating America's oldest and greatest institutions of democracy. Sadly, this is typical America."