Six times Jakub Mensik stood a single point from the biggest win of his life. Six times it slipped through his fingers. At 6-5 in the third set against Joao Fonseca, the 20-year-old Czech had match point after match point after match point — and could not put any of them away, the nerves and the moment and a teenager refusing to die all conspiring against him. If you have ever watched someone you are rooting for fail to close out the win, you know the particular agony of it. Six match points. Gone.
Then he won the tie-break anyway. 7-6(3), the third set, the match, the whole thing: 6-4, 6-3, 7-6(3). Jakub Mensik is into the semi-finals of a Grand Slam for the first time in his life, and the dream run that had lit up this entire tournament — Joao Fonseca's beautiful, noisy, Guga-Kuerten-chasing fortnight — is over.
It had to end somewhere. Almost nobody guessed it would end against someone even younger.
What just happened
Mensik beat Fonseca 6-4, 6-3, 7-6(3) in the Roland Garros quarter-final to reach his first major semi-final. He is 20 years old. Fonseca is 19. The match was, by both players' accounts, ferociously good — "an insane level from both of us," Mensik said afterward, and he was not exaggerating to be kind. Two of the youngest, most thrilling players in the world traded haymakers for the better part of three sets, and the only thing separating them at the end was that Mensik finally, on the seventh attempt, held his nerve in the tie-break after six match points had come and gone.
With the win, Mensik becomes the first man born in 2004 or later to reach the last four of a Grand Slam. The future of men's tennis did not arrive quietly today. It arrived in a three-set firefight between two kids, and one of them walked off into a semi-final.
The end of the Fonseca dream
For a week and a half, Joao Fonseca was the best story in Paris. The 19-year-old from Rio came back from two sets down to send Novak Djokovic home. He carried the loudest crowd in tennis through round after round. He had the whole sport wondering whether Brazil's long wait for the next Guga Kuerten was finally, impossibly, about to end this very fortnight.
And then it stopped, the way these things almost always do — not with a collapse, but against an opponent good enough to simply be a little better on the day. There is no shame in it. Fonseca took a 20-year-old who is every bit as much "the future" as he is, on the sport's most demanding surface, deep into a third-set tie-break in a match neither of them deserved to lose. He leaves Paris having beaten a 24-time major champion, having announced himself to an audience far beyond tennis, and having served notice that he will be doing this for the next fifteen years. The dream paused. It did not die.
But the headline today belongs to the other kid.
Jakub Mensik, the other future
If Fonseca has been the most-hyped teenager in the men's game, Jakub Mensik has been the quieter half of the same generational story. The Czech is 20, tall, and armed with one of the biggest serves on tour — a weapon that travels even on slow clay, which is precisely the kind of surface a serve like his is not supposed to thrive on. He has been climbing fast, a Masters 1000 finalist already, a player the locker room has known about for a while even as the cameras pointed elsewhere.
What he had not done was go deep at a major. Today he did, and he did it the hard way: surviving his own nerves, surviving six squandered match points, surviving a teenager swinging freely with a whole country roaring behind him. That is not the win of a kid who got lucky. That is the win of a player learning, in real time and on the biggest stage, how to drag himself over the line when his hands are shaking. Those are the wins that make careers.
He will play Alexander Zverev in the semi-finals — Zverev, the two-time major finalist, the highest seed left, who took apart Rafael Jodar 7-6, 6-1, 6-3 to get there. It is a brutal step up. It is also, for a 20-year-old in his first major semi, the kind of problem you are thrilled to have.
"An insane level from both of us"
The line Mensik gave afterward — "an insane level from both of us" — is the part worth holding onto, because it reframes the whole thing. This was not an upset in the sad sense, one player failing. It was two of the best young players alive pushing each other to a level that, frankly, the men's game has been waiting for. For years we have asked who comes after the giants. Today, in a draw that has already thrown out Alcaraz, Sinner and Djokovic, the answer played itself out in front of us: it is these two, and players like them, and the rivalry between Mensik and Fonseca is going to be one of the things that makes the next decade of tennis worth watching.
One of them had to lose this one. The lovely thing is that they are both going to be back here, on courts like this, for a very long time.
What it means for the wide-open draw
Step back and look at what the men's tournament has become. With the favourites gone, the semi-finals now feature Mensik — a 20-year-old in his first major semi — against Zverev, the veteran finally handed the open draw he has waited his whole career for. A first-time Grand Slam champion is still guaranteed. And one of the two men two wins from that maiden title is a kid who, an hour ago, could not convert six match points and then found a way to win anyway.
That is the gift of a tournament like this one. The door that the giants usually keep shut has been flung open, and the players walking through it are not weary veterans cashing a last chance — several of them are the actual future of the sport, getting their breakthrough a year or two early because the moment arrived and they were brave enough to take it.
What is confirmed, and what is just mood
Confirmed: Jakub Mensik (Czech, 20) beat Joao Fonseca (Brazil, 19) 6-4, 6-3, 7-6(3) in the Roland Garros 2026 quarter-final to reach his first Grand Slam semi-final, becoming the first man born in 2004 or later to reach a major semi-final. He squandered six match points at 6-5 in the third set before winning the tie-break. He described it as "an insane level from both of us." He will face Alexander Zverev, who beat Rafael Jodar 7-6, 6-1, 6-3, in the semi-finals. With Alcaraz, Sinner and Djokovic all out, a first-time men's Grand Slam champion is guaranteed.
Just mood: whether Mensik can take the next step against Zverev, and whether this is the match people point back to in ten years as the start of the Mensik-Fonseca rivalry. It has the feel of a beginning. But finals are not won on feel, and Zverev is a substantial wall to climb.
The bottom line
Joao Fonseca gave this tournament its heartbeat for a week and a half, and today his run ended — not to a fading champion or a bad day, but to another 20-year-old who is just as much the future as he is. Jakub Mensik wasted six match points, stared down a teenager and a roaring crowd, and won anyway, reaching the first Grand Slam semi-final of his life and becoming the youngest kind of name this sport has been waiting for.
The giants opened the door at Roland Garros 2026. What is walking through it, it turns out, is the next generation itself — arriving early, arriving brave, and arriving in pairs. One of them lost today. Both of them are going to spend the next fifteen years making us very glad we watched. For now, Jakub Mensik is two wins from a maiden Grand Slam title, and absolutely nobody can tell you he does not belong there.
Sources
- ATP Tour: Jakub Mensik converts 7th MP, beats Joao Fonseca to reach first major SF at Roland Garros
- ATP Tour: Jakub Mensik on Joao Fonseca win — "It was an insane level from both of us"
- Roland-Garros official: Mensik vs Fonseca, quarter-final score
- Bleacher Report: Jakub Mensik beats Joao Fonseca, updated French Open men's bracket
- Outlook India: Jakub Mensik defeats Brazilian teenager to book SF spot at Roland-Garros
- Roland-Garros official: Unbothered, Zverev moves into another semifinal (Zverev d. Jodar)
- ATP Tour: Roland Garros 2026 — players to watch after the favourites fell
Photo: Jakub Mensik at ATP Basel 2025 / Skyscraper2010 / Wikimedia Commons / CC BY-SA 4.0
