On a sun-soaked Thursday morning in Madrid, Alexander Blockx delivered a performance that sent shockwaves through the tennis world, ousting defending champion Casper Ruud 6-4, 6-4 to reach his first-ever Masters 1000 semi-final at the Mutua Madrid Open. For the 21-year-old Belgian, this wasn’t just another win—it was a statement, a breakthrough, and perhaps the dawn of a new era for Belgian tennis.
Few could have predicted such an outcome at the start of the tournament. Blockx, who began 2026 ranked outside the world’s top 100, only found himself in the main draw after Poland’s Kamil Majchrzak withdrew at the last minute. “The day before the qualies started, I did not even know if I would get into the main draw,” Blockx told Sky Sports presenters Gigi Salmon and Colin Fleming. “Eventually, I got in, and to be standing here is unbelievable. I never expected this to happen.”
Blockx’s journey to the semi-finals has been nothing short of remarkable. Entering the event ranked No. 69, he’s toppled three straight top-20 opponents, including Cristian Garin, Brandon Nakashima, Felix Auger-Aliassime, Francisco Cerundolo, and now Ruud—the world No. 12 and a two-time Grand Slam finalist. With Thursday’s win, Blockx not only ended Ruud’s nine-match Madrid winning streak but also became just the third Belgian in history to reach a Masters 1000 semi-final, following in the footsteps of Christophe Rochus and David Goffin.
From the first game, Blockx looked unfazed by the occasion or the pedigree of his opponent. He broke Ruud in the fifth game of each set and never relinquished his lead, maintaining a composure that belied his age and experience. His match statistics told the story: two aces, three double faults, a 51% first serve percentage, and a staggering 85% of points won on his first serve. He converted three of seven break points, while Ruud managed just one of three.
Asked if he felt any nerves closing out the match against such a decorated opponent, Blockx replied, “I was actually really composed. I felt like the match was still in my hands. Even if it gets to 5-5, I still have the advantage. I feel I am here for a reason. I don’t see myself as better, but nor do I see myself as lower. I am just playing my game, and it worked out.”
There’s a sense that Blockx’s rise has come almost out of nowhere, but a closer look reveals a steady progression. He started the year ranked No. 117, spent much of last season on the Challenger circuit, and made his Grand Slam main draw debut as a lucky loser at the Australian Open in January. “It’s been a long journey,” Blockx reflected. “The next couple of years after Bolton, I had some growth spurts where I did not play too well or too much, as I was having a lot of knee pain. I started to play better and better from 17, when I won the Australian Open [juniors] and got some confidence, and now I am here!”
His run in Madrid has been especially impressive considering the caliber of opponents he’s dispatched. After narrowly escaping in the first round, Blockx found his rhythm, using the unique clay court conditions to his advantage. “I’m proud of how I’m playing the last couple of matches,” he said. “I think the conditions suit me well here. It’s clay, which is slow. I have time to settle and hit my shots, go for my shots. But at the same time, it’s quite fast with the altitude and the heat sometimes. I think it’s the perfect combination for me.”
Blockx’s win over Ruud not only propelled him into the semi-finals but also guarantees him a place inside the top 35 in the ATP rankings next week. If Zizou Bergs fails to win in Aix-en-Provence, Blockx will become Belgium’s new No. 1—a feat achieved only twice before by Belgians at this level since the Masters series began in 1990.
Looking ahead, Blockx will face either Flavio Cobolli or Alexander Zverev in the semi-finals. The Belgian has yet to encounter Zverev on the ATP Tour but recently bested Cobolli at the Monte Carlo Masters. The head-to-head record between Zverev and Cobolli stands at 2-1 in favor of Zverev, though Cobolli won their most recent meeting in Munich. Their quarter-final clash is scheduled for Thursday evening, and Blockx will be watching closely to see which challenge awaits him next.
Blockx’s remarkable run has also reignited conversations about the future of Belgian tennis. With his youth, resilience, and powerful baseline game, some are already wondering if he might be the next big thing for the sport in his country—a nation that has produced the likes of David Goffin and Christophe Rochus but rarely seen such a rapid ascent from a player so young. At just 21, Blockx is now the youngest Belgian quarter-finalist in Masters 1000 history.
The journey hasn’t been easy. Blockx’s junior years were hampered by growth spurts and persistent knee pain, but he found his form at 17, winning the Australian Open juniors and steadily building confidence. He capped off last year by reaching the Next Gen ATP Finals final, where he lost to Learner Tien in a rematch of the 2023 Australian Open boys’ final. Those experiences, it seems, have steeled him for the pressures of the professional circuit.
“I barely escaped in the first round. I was happy about that already. But semifinals I wouldn’t have even dreamed of to be here with,” Blockx admitted, still sounding somewhat in disbelief. His humility and candor have endeared him to fans and commentators alike, many of whom see in him a refreshing blend of talent and perspective.
As the Madrid Open heads toward its climax, all eyes will be on Blockx to see if his fairy-tale run can continue. Will he cap off his breakthrough week with a spot in the final, or will the experience of Zverev or the tenacity of Cobolli prove too much? One thing’s for sure: Alexander Blockx has already made history, and Belgian tennis suddenly has a new star to rally around.
With his semi-final opponent yet to be determined, anticipation is building in Madrid and far beyond. Blockx’s journey from a late entry to a Masters 1000 semi-finalist is a testament to perseverance, talent, and a little bit of luck—the ingredients that make sports so captivating. The next chapter of his story is about to unfold, and the tennis world will be watching every moment.