Carlos Alcaraz became world No. 1 for the second time, capping a historic 2025 season with Grand Slam titles and a dominant ATP Finals run.

Carlos Alcaraz has secured the ATP Year-End World Number One ranking for the second time in his career, achieving the milestone by defeating Lorenzo Musetti in his ATP Finals group stage match. The 22-year-old Spaniard, who surpassed Jannik Sinner in the year-end standings, capped a historic 2025 season with eight titles, including Grand Slam victories at the French Open and US Open. He reached nine consecutive finals, won 17 straight ATP Masters 1000 matches, and claimed the longest French Open final in history, saving three championship points. Alcaraz now joins Novak Djokovic as the only active players with multiple year-end No. 1 finishes. ATP Chairman Andrea Gaudenzi praised his achievement as extraordinary. Alcaraz advances to the ATP Finals semifinals, aiming for his first title in the event.