The 2025 men’s tennis clay court season kicked off its first Masters 1000 event in Monte Carlo on Tuesday, with the sport’s two top superstars Jannik Sinner and Carlos Alcaraz delivering dominant opening-round wins to fuel their tight, high-stakes battle for the ATP world number one ranking ahead of the French Open.
With Olympic sprint legend Usain Bolt watching from the stands of the Monte-Carlo Country Club, the top two-ranked players turned in clinical performances that sent them smoothly into the tournament’s second round. Second-ranked Sinner, the Italian powerhouse who enters the clay swing in red-hot form, took just 64 minutes to blow past France’s Ugo Humbert in a lopsided 6-3, 6-0 victory. Shortly after, world No. 1 and defending Monte Carlo champion Carlos Alcaraz followed Sinner onto center court, wrapping up a 6-1, 6-3 win over Argentina’s Sebastian Baez 69 minutes after the opening first serve.
This clay season carries extra significance for Sinner, who is still chasing his first ATP Masters 1000 title on clay and gunning to knock Alcaraz off the top spot in the global rankings. The Italian comes into Monte Carlo fresh off a historic unbeaten Sunshine Double in March, where he claimed back-to-back titles at the Indian Wells and Miami Open without dropping a single set. Tuesday’s win extended his winning streak at 1000-level events to an impressive 18 matches.
Speaking after his victory, Sinner acknowledged the challenge of adapting his game to his first clay tournament of the season. “It was a good performance from my side. The first clay event is never easy. You have to change your game style a little bit, how you approach certain situations. I come here with good feelings but, at the same time, not many expectations,” he said.
Against Humbert, a player he had not faced in five years, Sinner took a handful of games to find his rhythm on the red dirt. He broke Humbert’s serve in the fifth game to take control of the first set, closing it out 6-3. The second set was a complete rout: Sinner dropped zero games, sweeping Humbert aside 6-0 in just 23 minutes. He will next face the winner of the match between Argentina’s Francisco Cerundolo and Czech qualifier Tomas Machac.
For Alcaraz, the opening win marked a promising return to his favored surface after a long hard-court stretch. The 21-year-old Spaniard admitted he had been eager to get back on clay. “It’s been almost one year since the last match I played on clay. To be honest, I missed it. I missed getting myself dirty a little bit,” he said. Last clay season, Alcaraz dominated the surface, claiming three titles from four tournaments including the Monte Carlo crown, with his only defeat coming in the Barcelona final.
Alcaraz’s path to retaining the world number one ranking is already an uphill battle, as ranking regulations reset points after 12 months, and Sinner has no points to defend from Monte Carlo this year. After his opening win, Alcaraz openly acknowledged that Sinner’s ascent to the top spot is only a matter of time. “I’m going to lose the number one in the world. I don’t know if it’s going to be in this tournament or the next one. It is going to be really difficult to defend all the points and even if I do, Jannik is going to add some points in this tournament. Number one is not on my mind but to be my best on clay and let’s see how the clay court season is going to be,” Alcaraz explained.
The Spaniard’s performance against Baez even exceeded his own expectations. He sailed through the first set, hit a small rough patch in the second, then closed out the match by winning the final seven consecutive points to seal victory. “A really good start to the tournament for me. I surprised myself with the level. I thought I was going to play a little bit worse,” he said. Alcaraz will next meet either Argentina’s Tomas Etcheverry or France’s Terence Atmane in the second round.
The 2025 clay season already carries extra narrative weight after last year’s dramatic Roland Garros final, where Sinner — returning from a doping ban that sidelined him for the start of the clay swing — pushed Alcaraz to a five-hour, five-set epic. Sinner held a two-set lead and three championship points before ultimately falling to the Spaniard, setting the stage for a rematch that could come at any point during the clay swing, including Monte Carlo.