Sinner is doubled over between points and is struggling to move. It’s hard to imagine him playing another set like this, let alone winning one. Cerundolo, for his part, is keeping his focus. He holds to start the fourth set.

That’s another 10 minutes between points for Jannik Sinner after leaving the court for a toilet break following the third set. This could be the most stunning collapse, but Sinner just needs to buy himself some time to recover: the thing is, the day is just getting hotter.

The fourth set is underway.

WOW! Juan Manuel Cerundolo breaks Jannik Sinner to win the third set, dragging the world No 1 into more punishment! Sinner leaves the court for more treatment.

Sinner has lost six games in a row to Cerundolo, having led 6-3 6-2 5-1, seemingly on the brink of the third round.

But as the temperature climbed in Paris, Sinner started to wilt in the Paris heat. He lost 15 points in a row before he took a medical timeout and left the court for treatment.

Once he returned, Cerundolo held to lead. Sinner slumped a forehand into the net when facing set point.

Is his French Open on the brink?

We thought this match was done. Jannik Sinner was on the brink of the third round, now Juan Manuel Cerundolo leads the third set 6-5.

Sinner has called for more treatment during the change-over. He has reportedly had his blood pressure taken, and he still looks pretty dizzy.

We thought this match was done. Jannik Sinner was on the brink of the third round, now Juan Manuel Cerundolo leads the third set 6-5.

Sinner has called for more treatment during the change-over. He has reportedly had his blood pressure taken, and he still looks pretty dizzy.

Cerundolo is not happy that Sinner was allowed to leave the court mid-game, but the Italian has returned and has picked up his racket again.

Cerundolo has three break points to get back on serve after trailing 5-2 in the third set.... and Cerundolo has made it 16 points in a row to level the third set at 5-5!

There were 10 minutes between points.

He then had a fortunate escape against Eliot Spizzirri in this season’s Australian Open, suffering cramps as temperatures reached 36 degrees before the tournament’s extreme heat rule was enforced and Sinner was able to recover before progressing in four sets.

Is it happening again?

Juan Manuel Cerundolo has won 15 points in a row against Jannik Sinner on Philippe-Chatrier! From 5-2 up, it’s now 5-4, 0-40, and Sinner is calling the physio!

WOW! The heat has got to Sinner! Here comes the trainer. This is extraordinary.

Sinner tells the trainer he feels dizzy and is about to vomit. He is heading off the court during the game.

Jannik Sinner was broken when serving for the match, with Juan Manuel Cerundolo then holding to love... He will try again at 5-4 in the third.

Over on Suzanne-Lenglen, Adolfo Daniel Vallejo has broken back against Moise Kouame. That match has now extended past the three-hour mark and is turning into a bit of a classic to say the least! It’s 2-1 to Vallejo and the crowd are urging Kouame and trying to give the teenager some energy.

Encroyable! Moise Kouame returns from a off-court break to get the crucial opening break in the fourth set! Adolfo Daniel Vallejo goes long after the baseline exchange with Kouame holding firm, and the teenager raises his arm in celebration.

Elsewhere, Jannik Sinner is one game away from the third round and beating the two-hour mark.