Alexander Blockx stuns defending champion Casper Ruud at Madrid Open

Key facts

• Alexander Blockx defeated Casper Ruud in the quarter-finals of the 2026 Mutua Madrid Open.
• Ruud was the defending champion and a two-time finalist at Roland Garros.
• Blockx entered the tournament as a qualifier and had previously beaten Felix Auger-Aliassime.
• The match took place at the Caja Mágica in Madrid, Spain, on Thursday, April 30.
• Blockx is known for a powerful serve and a heavy forehand, particularly effective on clay.
• Ruud's topspin forehand and point construction were considered key advantages before the match.

A qualifier's audacious run

Alexander Blockx, a 21-year-old Belgian who entered the Mutua Madrid Open as a qualifier, knocked out the defending champion Casper Ruud in the quarter-finals on Thursday, April 30. The victory, played on the clay courts of the Caja Mágica, extends a remarkable run that already included a win over Canada's Felix Auger-Aliassime. Blockx, who had been a known quantity on the Challenger Tour, is now making his mark on the ATP's biggest stage.

How Blockx overpowered the favourite

Blockx's game is built around a massive serve and a wicked forehand, weapons that proved decisive against Ruud. The Norwegian, a two-time Roland Garros finalist and the tournament's defending champion, typically dominates on clay with his heavy topspin forehand and tactical point construction. But Blockx matched him shot for shot, using his raw power to dictate rallies. 'When I was serving it out, I had a random song in my head and was just singing it,' Blockx said, displaying the unflappable composure that has defined his run.

Ruud's reign ends in Madrid

For Ruud, the loss is a significant setback. He had won the Madrid title in 2025 and was considered a strong contender to defend it, given his elite clay-court pedigree. The defeat also disrupts his momentum heading into the French Open, where he has been runner-up twice. Ruud's exit leaves the bottom half of the draw open, with Alexander Zverev, Flavio Cobolli, and Marta Kostyuk among those still in contention.

The broader tournament picture

Blockx's upset is part of a day of dramatic quarter-final action. In the other men's match, Flavio Cobolli faced Alexander Zverev, with Zverev carrying pre-tournament futures bets in the fourth quarter. On the women's side, Marta Kostyuk defeated Anastasia Potapova, ending Potapova's impressive run. Kostyuk, who combined brilliant offense with superb defense, is now seen as a potential tournament winner. The Madrid Open continues to deliver surprises, with Blockx's emergence as the most compelling story.

What comes next for Blockx

Blockx now advances to the semi-finals, where he will face either Zverev or Cobolli. His run has already earned him a career-high ranking and a place in the spotlight. The question is whether he can sustain this level against the tour's elite. His next opponent will test his ability to handle pressure and adapt his game. For now, Blockx is enjoying the moment, and his relaxed demeanor suggests he is not intimidated by the stage.

The bottom line

• Alexander Blockx, a qualifier, defeated defending champion Casper Ruud in the Madrid Open quarter-finals.
• Blockx's powerful serve and forehand neutralized Ruud's clay-court expertise.
• Ruud's loss ends his title defense and raises questions about his form ahead of the French Open.
• Blockx's run is the biggest surprise of the tournament so far, reminiscent of past qualifier breakthroughs.
• Marta Kostyuk also advanced, defeating Anastasia Potapova, and is now a contender for the women's title.
• The Madrid Open semi-finals will feature Blockx against either Zverev or Cobolli, with the Belgian aiming to continue his fairy-tale run.