GSTAAD, Switzerland — 21-year-old Argentine Juan Manuel Cerundolo toppled top seed Casper Ruud 6-4, 3-6, 7-5 in the quarterfinals of the 2026 EFG Swiss Open Gstaad on Friday. The unseeded left-hander shattered Ruud’s clay court dominance in a day of widespread upsets, which also saw top seed Alexander Bublik exit.
Cerundolo’s victory was the headline of a seismic shift in the Swiss Alps. The Argentine, ranked No. 112, played aggressive baseline tennis, neutralizing Ruud’s heavy topspin forehand with precise angles. ATP stats confirm Cerundolo struck 28 winners to Ruud’s 19, with 22 unforced errors each. The match turned late in the third set, when Ruud, serving at 5-6, double-faulted on break point. Cerundolo converted his second match point.
Ruud, a three-time Roland Garros finalist, looked in control after taking the second set. But the pattern mirrored his 2025 Gstaad exit—a nightmare twist, as described by Lob and Smash. “He was visibly frustrated,” the outlet noted. Ruud failed to convert 4 of 6 break points, and his serve percentage dropped to 54% in the deciding set. This marks his second straight quarterfinal loss in Gstaad to a lower-ranked Argentine.
The chaos extended beyond the center court. Bublik, the No. 1 seed, lost in straight sets to qualifier Dominic Stricker, 7-6(4), 6-3. Sky Sports highlights show a day of relentless unpredictability, with four seeds eliminated before the semifinals.
Cerundolo, 21, now holds a career-defining win. His previous best ATP result was a Challenger title in Buenos Aires earlier this year. This victory projects him into the Top 100 for the first time. “It’s a big step,” he said post-match. “I believed I could beat him.”
For the ATP clay court hierarchy, the result raises questions. Ruud, who won four clay titles in 2025, has now lost two of his last three matches on the surface to players outside the Top 100. The emerging generation of Argentine clay specialists—including Cerundolo and Francisco Cerundolo (no relation)—is reshaping the baseline. Next up for Cerundolo is a semifinal against Jan-Lennard Struff.
Ruud will shift focus to the North American hard court swing, starting with Montreal. “I need to reset,” he said. “This one hurts.”
| Statistic | Cerundolo | Ruud |
|---|---|---|
| Winners | 28 | 19 |
| Unforced Errors | 22 | 22 |
| Break Points Converted | 3/5 | 2/6 |
| First Serve % (Deciding Set) | 61% | 54% |
💡 Frequently Asked Questions (FAQ)
- Q: Who is Juan Manuel Cerundolo?
- A: Juan Manuel Cerundolo is a 21-year-old Argentine tennis player ranked No. 112 who defeated top seed Casper Ruud at the 2026 Swiss Open Gstaad.
- Q: What happened in the match between Cerundolo and Ruud?
- A: Cerundolo won 6-4, 3-6, 7-5 in the quarterfinals, hitting 28 winners and capitalizing on a double fault from Ruud at 5-6 in the third set.
- Q: Why is this considered a major upset?
- A: Ruud is a three-time Roland Garros finalist and clay court specialist, while Cerundolo was unseeded and ranked outside the top 100.
- Q: What other upsets happened at Gstaad that day?
- A: Top seed Alexander Bublik also lost in straight sets to qualifier Dominic Stricker, and four seeds were eliminated before the semifinals.
Extended Reading
For full match highlights and tournament updates, refer to ATP Tour match report, Lob and Smash analysis, and Sky Sports video coverage.