Alcaraz vs. Sinner — Six Finals, One Season, and Tennis's New Rivalry

In 2025, Carlos Alcaraz and Jannik Sinner played each other six times. All six were finals. Between them, they won every Grand Slam contested that year — the first time in the Open Era that two players have split all four majors' finals in a single season between just themselves.

A rivalry with almost no gaps in it

Alcaraz leads their head-to-head 10-7, but the surface breakdown shows how close and complete this rivalry actually is: Alcaraz leads 6-2 on outdoor hard courts and 3-2 on clay, the two are tied 1-1 indoors, and Sinner is unbeaten against Alcaraz on grass, 2-0. There isn't a surface where either man has a clean, uncontested edge.

The final that ran longer than any other

Their 2025 French Open final is already being talked about as one of the greatest matches ever played. It lasted five hours and 29 minutes — the longest final in Roland-Garros history — and Alcaraz won it 4-6, 6-7(4), 6-4, 7-6(3), 7-6(10-2), saving three championship points along the way before closing it out. Roger Federer called it "maybe one of the greatest games we've ever had in our sport." That same season, the two also met in the finals of Wimbledon, Cincinnati, the US Open, and the ATP Finals — six major finals across a single year, an unprecedented run for two players facing only each other.

A season with an asterisk neither of them chose

The rivalry's 2025 chapter carries real context worth stating plainly: Sinner served a three-month ban that year after two positive tests for a banned substance in 2024. The World Anti-Doping Agency's own resolution found he had been inadvertently contaminated by a member of his support team, with no intent to cheat and no performance benefit gained — and he returned in time for the French Open, where the two met in that record-breaking final. It's part of the story of their 2025 season, whether either player would have chosen it to be or not.

Tennis hasn't seen this in years

Between them, Alcaraz and Sinner won nine consecutive Grand Slam titles, from the 2024 Australian Open through the 2026 Australian Open — a streak that finally ended when Alexander Zverev won the 2026 French Open. At 22, Alcaraz became the youngest man to complete the career Grand Slam, and by early 2026 held a 7-4 edge over Sinner in major titles won. The last time men's tennis had a rivalry this dominant, this evenly matched, and this constant, it was Federer and Nadal. Whether it's still just getting started is now a genuinely open question.