Japanese superstar Naomi Osaka was on Sunday threatened with disqualification from the French Open if she persists with her controversial media boycott, officials said.

“We have advised Naomi Osaka that should she continue to ignore her media obligations, she would be exposing herself to possible further code of conduct infringement consequences,” said a statement from the four Grand Slam tournaments after issuing the world number two with a $15,000 fine.

“As might be expected, repeat violations attract tougher sanctions including default from the tournament and the trigger of a major offence investigation that could lead to more substantial fines and future Grand Slam suspensions.”

Osaka, a four-time Grand Slam title winner and sport’s highest-earning female athlete, was sanctioned for refusing to hold a press conference after her opening 6-4, 7-6 (7/4) victory over Romanian world number 63 Patricia Maria Tig.

The 23-year-old had said on the eve of the tournament that she would refuse to carry out any media obligations, claiming news conferences are detrimental to her mental health.

She likened traditional post-match inquests to “kicking people when they’re down”.

French Tennis Federation president Gilles Moretton described Osaka’s vow of silence as “a phenomenal error”.

The four Grand Slam events — Wimbledon, the French, Australian and US Opens — said they had written to Osaka “to check on her well-being and offer support”.

“She was also reminded of her obligations, the consequences of not meeting them and that rules should equally apply to all players.

“Naomi Osaka today chose not to honour her contractual media obligations. The Roland Garros referee has therefore issued her a $15,000 fine.”

After her match on Sunday, Osaka agreed only to a cursory on-court TV interview.

“For me, playing on clay is a work in progress,” said the reigning US and Australian Open champion on a sun-kissed Court Philippe Chatrier.

“Hopefully the more I play, the better I will become.”

And that was that from a player who has now strung together 15 successive Grand Slam match wins.

• Lukaku left the Blues for Everton in 2014 and has gone from strength to strength 
• The 28-year-old scored 33 goals to help Inter Milan win Serie A this campaign 
• Nerazzurri are willing to sell the clinical striker to ease their financial troubles
• Callum Hudson-Odoi, Tammy Abraham, Oli Giroud and Fikayo Tomori may leave 

Chelsea are ready to re-sign Romelu Lukaku this summer as Thomas Tuchel plots a Premier League title challenge.

The Blues want a new centre forward ahead of next season — with the Inter Milan hitman viewed as the most realistic target by club recruitment staff.

The newly-crowned European champions have built a formidable defensive record under Tuchel but have scored more than two goals in a game just once in 30 matches under the German. 

Improvement in front of goal will be key if Tuchel is going to go challenge Manchester City for domestic supremacy next season.

Despite scoring 33 goals in helping Inter win Serie A last season, the Italian club will listen to offers for Lukaku as they seek to ease financial concerns.

Tuchel has already admitted he would be interested in signing Harry Kane from Tottenham but a deal for the England captain to join Chelsea appears virtually impossible due to the intense rivalry between the London clubs. 

Borussia Dortmund striker Erling Haaland is also of interest to the Blues but a move for Lukaku is understood to be the club’s main focus, with his advisors believed to be aware of Chelsea’s interest.

The Belgian striker spent three years at Chelsea but the club let him move to Everton in 2014

Having signed for Chelsea as an 18-year-old in 2011, Lukaku made just one Premier League start for the club before successful loan spells at West Bromwich Albion and Everton, who he joined for £28 million in 2014.

Lukaku is now viewed as one of Europe’s premier centre forwards and, at 28, is entering his prime. Inter are understood to value Lukaku at £100m but Chelsea will be keen to negotiate a lower price given Inter’s need to sell.

Chelsea are also targeting a central midfielder and defender ahead of next season, with West Ham’s Declan Rice a long-term midfield target.

On the prospect of adding to his squad, Tuchel said: ‘Two or three could be very, very good. It’s a constant thing to never deny change. 

Erling Haaland (left) and Harry Kane (right) are also options but Lukaku is the most likely move

‘Then you always bring new energy, new guys who question the old beliefs, who challenge everybody in the training and in matches. I think it’s a good thing.

‘We don’t need a complete turnover because it’s also our job to keep on improving. We have still a young squad that is capable of growing and evolving. But we have some ideas, of course, to make the group stronger.’

There are also set to be a number of outgoings with Callum Hudson-Odoi among the players whose future is uncertain as Borussia Dortmund plot to sign the England international.

The Blues academy graduate, who was previously a target for Bayern Munich, has fallen out of favour following a promising start to life under Tuchel

Tammy Abraham (left) and Olivier Giroud (right) are among several players who could depart

It remains to be seen whether Chelsea are willing to entertain letting the 20-year-old leave this summer.

However, Sportsmail has learned they would be open to discussing a deal that included Dortmund’s Jadon Sancho — who is a target for Manchester United — moving to Stamford Bridge.

Tammy Abraham, who was left out of the squad for the Champions League final win over City, is also resigned to leaving the club this summer. Fellow striker Olivier Giroud is expected to follow him out the door when his contract expires next month.

Central defender Fikayo Tomori is set to join AC Milan on a permanent deal following a successful loan spell in Italy, while midfielder Billy Gilmour will be a loan target for a number of Premier League teams.  

Chelsea Football Club On Saturday won the UEFA champions league final with a one zero win against Manchester City. See how they celebrated.

Chelsea Football Club On Saturday won the UEFA champions league final with a one zero win against Manchester United. See how they celebrated.

Ese Brume has broken Chioma Ajunwa’s 25 years African women’s long jump record in the US.

At the Chula Vista Field festival in California, she leaped 7.17 meters to break Ajunwa’s record of 7.13m set at the 1996 Atlanta Olympic Games.

Her new jump record is also the world leader in the long jump women’s event ahead of the postponed 2020 Tokyo Olympics.

She achieved the feat after her sixth attempt, having jumped 6.75m, 6.83m, 6.83m, 6.88m, and 6.83m respectively.

At the Turkish championships in Bursa on August 5, 2019, she broke the 7-meter barrier for the first time in her career and surpassed the mark twice in the competition.

She leaped 7.05m and achieved the second-best African performance in history.

Two months later, she won the bronze medal in the World Championships in Doha with a jump of 6.91m.