Not the Heat, Jannik Sinner Reveals Real Reason Behind Shock French Open Exit

Jannik Sinner arrived at Roland Garros looking almost untouchable. Two rounds later, the world No. 1 is heading home.

The overwhelming favorite for the French Open title suffered one of the biggest upsets of the season on Thursday, squandering a two-set lead and a 5-1 advantage in the third set before crashing out to Argentina's Juan Manuel Cerundolo 3-6, 2-6, 7-5, 6-1, 6-1. But while soaring temperatures in Paris quickly became the talking point, Sinner insisted the heat was not responsible for his dramatic collapse.

Instead, the Italian revealed he had been feeling unwell long before stepping onto Court Philippe-Chatrier.

Jannik Sinner reveals illness behind shock French Open defeat

For more than two hours, the match appeared to be following a familiar script.

Sinner, who entered the tournament on a 30-match winning streak, raced through the opening two sets and looked poised to secure his place in the third round when he surged to a 5-1 lead in the third.

Then everything changed.

The Italian suddenly lost rhythm, energy, and momentum. Cerundolo sensed an opportunity and never looked back, reeling off game after game as Sinner struggled physically.

Speaking after the match, the 24-year-old admitted he had felt below his best from the start.

"I woke up this morning and didn't feel very well," Sinner said.

"I tried to keep the points very short in the beginning. I was hitting very clean, very good and then I just kind of hit the wall and that's it."

The collapse was staggering. At one stage, Sinner lost 18 consecutive points as the match slipped from his grasp.

Was the Paris heat responsible?

The conditions certainly appeared to tell a story.

Temperatures climbed above 30 degrees Celsius during the afternoon, and Sinner has previously struggled in extreme heat. Earlier this year at the Australian Open, he benefited from the tournament's heat policy after battling through difficult conditions.

This time, however, he dismissed the suggestion that the weather was the deciding factor.

"It was warm, but not crazy warm," Sinner explained.

"I feel like it was quite okay to play and really it was nothing against the heat, nothing against the weather. It was just me today, but it happens."

While the heat may have amplified his struggles, Sinner was adamant that illness and a lack of energy-not the Paris sunshine-were behind the defeat.

Juan Manuel Cerundolo seizes his moment

As much as the spotlight will fall on Sinner's collapse, Cerundolo deserves enormous credit for capitalizing on it.

Many players would have folded mentally after finding themselves two sets down against the world No. 1. Instead, the Argentine remained composed and continued forcing Sinner into longer rallies as the Italian's movement and intensity declined.

Once the momentum shifted, Cerundolo played with increasing confidence while Sinner searched desperately for answers.

By the fifth set, the upset no longer felt impossible. It felt inevitable.

What Sinner's exit means for the French Open draw

The ramifications extend far beyond one match.

Coming into Roland Garros, Sinner was viewed as the clear favorite, especially after Carlos Alcaraz withdrew from the tournament with a wrist injury. The pair had won the previous nine Grand Slam titles between them and had turned men's tennis into an increasingly exclusive rivalry.

Now, for the first time since the 2023 US Open, a Grand Slam champion will be crowned from outside the Sinner-Alcaraz duopoly.

The result has suddenly transformed the complexion of the tournament.

Novak Djokovic, chasing a record-extending 25th Grand Slam title, no longer has to navigate either of the sport's two dominant forces. Meanwhile, a host of contenders who began the fortnight as outsiders will now believe a path to the Coupe des Mousquetaires has emerged.

What's next for Sinner?

The defeat also raises questions about Sinner's immediate schedule.

After an exhausting clay-court swing and a physically draining exit in Paris, the Italian revealed he intends to take time to recover before turning his attention to Wimbledon.

Given his recent dominance, one shock defeat is unlikely to alter perceptions of his status as the world's best player.

Yet sport has a way of humbling even its strongest favorites.

Just days ago, Roland Garros appeared to be Sinner's tournament to lose. In the span of one remarkable afternoon, it became everyone else's to win.