Regardless of his early exit in Paris, Jannik Sinner will remain world number one after this tournament.

Sinner, who in 2024 became the first Italian to reach number one in the ATP rankings, has held the position for 73 weeks in total.

He and Carlos Alcaraz have been alternating at the top, but with Alcaraz out of action for the grass season, Sinner is set for an extended stay at the top.

At the top of this page, you can have your say on who you think will win the men's title, following Jannik Sinner's surprise exit earlier.

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Jannik Sinner arrived in Paris off the back of a trio of Masters titles in Monte-Carlo, Madrid and Rome, and headed into his second-round tie unbeaten in 18 matches on clay in 2026.

But has he suffered because of his busy schedule?

"He's probably played too much," said 1988 finalist Henri Leconte on TNT Sports. "I thought after Madrid, you stop and not play Rome."

Former British number one Tim Henman agreed: "You play one of Madrid or Rome."

It's the earliest Jannik Sinner has lost at a Grand Slam since he was beaten by world number 74 Daniel Altmaier at the 2023 French Open - and even then, he had two match points in an epic that lasted five hours and 26 minutes.

In the 11 Grand Slams since then (until today), he had only failed to reach the semi-finals twice, winning four of those tournaments.

Tim Henman
Former British number one on TNT Sports

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Everyone was saying Sinner’s going to win. He’s been unbeatable in the past few months. It’s amazing how it’s unravelled in the heat.

Sinner is still very young. He’s going to win Roland Garros one day.

I’m sure him and his team will analyse this. It was against the American – Eliot Spizzirri - in Melbourne when he struggled [in the heat].

Juan Manuel Cerundolo caused a massive shock on Court Philippe-Chatrier by beating the world number one and French Open favourite Jannik Sinner.

His older brother, Francisco Cerundolo, is also into round three with a four-set win against Frenchman Hugo Gaston.

If their respective winning runs continue, they could meet in the semi-finals...

Tim Henman
Former British number one on TNT Sports

[I've said] it's only going to be an injury or an illness [to stop Sinner]. And that is the physical side of it [today].

It's not like he had a bad day at the office because of his tennis - he was two sets and 5-1 [up].

But his five-set record, he struggles. In the heat, he struggles. And that's exactly what's happened.

BBC Radio 5 Sports Extra

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Jannik Sinner's defeat also means he will have to wait another year for his chance to complete his set of Grand Slam titles, something rival Carlos Alcaraz did at the Australian Open.

Sinner had already won the Australian and US Opens, and collected the Wimbledon title last year.

But he won't be adding his name to the list of six men - Rod Laver, Andre Agassi, Roger Federer, Rafael Nadal, Novak Djokovic and Alcaraz - who have achieved the full set in the Open era.

No surprises about what the big story of the day is!

But elsewhere...

• 17-year-old Frenchman Moise Kouame has continued his dream run at Roland Garros - he beat Adolfo Daniel Vallejo in five sets to reach the third round.
• Naomi Osaka and Iva Jovic have booked third-round spots in the women's draw.
• Still to come... Aryna Sabalenka, Amanda Anisimova, Coco Gauff and Great Britain's Katie Boulter.

Russell Fuller
BBC tennis correspondent on BBC Radio 5 Sports Extra

It is not easy to be able to play like that against an injured opponent, so a huge credit to Cerundolo for doing just that. This was so impressive, the way he handled it and he never let Sinner back into the match.

I do feel sorry for Sinner, because physically it is more difficult for him to deal with these conditions as a redhead and his complexion makes it difficult.

I don't think we can say that he didn't prepare properly but I would say he has played and won too many matches to get to this point. He was relentless and it was probably a combination of many factors.

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With no Carlos Alcaraz because of injury, and now Jannik Sinner eliminated in the second round, that opens the men's singles draw right up at Roland Garros.

Is this the time for Novak Djokovic to clinch that record-breaking 25th Grand Slam singles title? Will Alexander Zverev finally land his first? Or will someone else emerge from the pack?

We've got a fascinating week and a bit ahead of us in Paris.

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That was Jannik Sinner's first defeat since mid-February, and ends his 30-match winning streak.

It also means that for the first time since the 2023 US Open, someone other than Carlos Alcaraz or Jannik Sinner will win a men's Grand Slam singles title.

Annabel Croft
Former British number one on BBC Radio 5 Sports Extra

I thought Cerundolo gave a very humble speech there and it was like he didn't deserve the win but he absolutely does.

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Juan Manuel Cerundolo, speaking on court after his five-set victory over world number one Jannik Sinner:

"It's tough for him, he was leading the match and I couldn't win more than three games in a set.

"I was a little bit lucky and I feel sorry for him, he was serving to win the match. Then I don't know what happened, I think he was cramping. Of course I feel sorry for him and I hope he recovers."

On reaching the third round at a Grand Slam for the first time in his career: "I'm super happy, I will try to keep playing my best. I like to play this tournament because clay is my best surface and I hope to be ready for the next match."

Annabel Croft
Former British number one on BBC Radio 5 Sports Extra

This is a seismic shock. So many of us were standing there at the start of this tournament saying who on earth can challenge Sinner for this title?

Everyone was on their feet, I think they were a bit stunned at the way the drama played out. It certainly opens this tournament and send shockwaves through the draw.

Annabel Croft
Former British number one on BBC Radio 5 Sports Extra

Carry on and see what happens is good advice from the Sinner camp. It isn't about the tactics any more, it is about the physicality.

The Jannik Sinner of the first two sets is long gone now, but the Italian can still show flashes of brilliance, as evidenced by the ferocious forehand return with which he punishes a nervy second serve from Juan Manual Cerundolo.

Sinner earns a couple of break points but Cerundolo stays strong to hold.

He is now just one game from a famous victory.

Annabel Croft
Former British number one on BBC Radio 5 Sports Extra

That was the most pace that Sinner has put in his serve. I don't think he has it in him to do long physical rallies at the back of the court but he has it in him to energise some of the ground strokes. I think we will see him still fight.