Cerundolo Shocks Tsitsipas in First-Round Upset at Rolex Monte-Carlo Masters

The hierarchy of clay-court tennis shifted violently on Monday at the Monte-Carlo Country Club. Francisco Cerundolo, the Argentine No. 16 seed, dismantled three-time champion Stefanos Tsitsipas 7-5, 6-4 in the opening round of the 2026 Rolex Monte-Carlo Masters, marking one of the most significant upsets in the tournament’s recent history.

For Tsitsipas, the defeat is more than just a first-round exit; it is a collapse of a fortress. Before Monday, the Greek had maintained a dominant 22-4 record across seven appearances in the principality, having never previously lost before the third round. The loss effectively ends his reign as a perennial favorite in Monte Carlo and sends his ATP ranking plummeting toward world No. 65—his lowest standing since 2018.

A Tale of Two Momentum Shifts

The match was defined by Cerundolo’s ability to seize control at critical junctures, overcoming early resistance from the former champion. In the opening set, Tsitsipas appeared to be in control, leading 5-3 and threatening to push the match into a decider. Yet, the 27-year-old Argentine responded with a clinical surge, winning four consecutive games to claim the set 7-5.

The second set followed a similar pattern of volatility. Cerundolo stormed to a 4-0 lead, leaving Tsitsipas reeling. The Greek managed to claw his way back to 4-4, momentarily reviving his hopes of a comeback. That momentum was short-lived; Cerundolo broke serve in the ninth game and held steady to close out the match 6-4.

This victory marks the 15th win of the 2026 season for Cerundolo, who is currently ranked world No. 19. While he has found success elsewhere this year—including a title in Buenos Aires and a quarterfinal run in Miami—the clay of Monte Carlo had previously been a stumbling block. In his three prior appearances at this Masters 1000 event, he had never advanced past the second round.

The Decline of a Clay-Court Giant

The contrast in trajectories between the two players is stark. While Cerundolo is finding his footing on the big stages, Tsitsipas is grappling with a sustained decline. After winning the Monte Carlo title in 2024, he failed to defend it in 2025, losing in the quarterfinals to Lorenzo Musetti. Since then, the Greek’s form has continued to slide.

Former ATP player Rob Koenig, commentating for Tennis TV, noted that the warning signs were present long before this first-round exit. Koenig pointed to 2025, noting that while Tsitsipas won in Dubai, “there were definitely some cracks appearing in his game.” The resulting loss of points from his 2024 title run has accelerated his slide out of the top tiers of the rankings.

The head-to-head history also favors the narrative of a changing guard. In their two previous encounters—both on hard courts in Basel and Paris in 2024—Cerundolo had failed to secure a victory. On the red clay of Monaco, however, the Argentine found a tactical edge that Tsitsipas could not answer.

What This Means for the Draw

Cerundolo’s breakthrough removes a massive obstacle from his path and opens up a section of the draw that was previously guarded by a three-time champion. His victory proves he can maintain composure against elite opposition on the clay, a confidence boost that will be vital as the tour heads toward Roland Garros.

For the wider tournament, the exit of Tsitsipas leaves a vacuum. With Carlos Alcaraz and Jannik Sinner positioned as the primary contenders in the race back to the French Open, the removal of a seasoned veteran like Tsitsipas from the late stages of the Monte-Carlo Masters alters the competitive dynamics for the remaining seeds.

Cerundolo now advances to the second round, where he will look to build on this momentum and finally break his historical ceiling in Monte Carlo. For Tsitsipas, the focus shifts to a grueling climb back up the ATP rankings.

Stay tuned to Archysport for live updates and further analysis as the Rolex Monte-Carlo Masters progresses. Who do you think is the favorite for the title now that Tsitsipas is out? Let us know in the comments.