Felix Auger-Aliassime of Montreal scored a 6-3, 6-4 win over top-seeded Rafael Nadal in round-robin play at the ATP Finals on Tuesday.
Auger-Aliassime, seeded fifth in the season-ending men's championship, won 81 per cent of his first serve points and delivered 15 aces It was his first career win over the 22-time Grand Slam champion.
Nadal had beaten Auger-Aliassime twice previously, including a gruelling five-set decision at the French Open in May. The 22-year-old Auger-Aliassime opened the season-ending tournament on Sunday, losing 7-6 (4), 6-4 to Norway's Casper Ruud.
Auger-Aliassime will next meet eighth-seeded American Taylor Fritz, while the 0-2 Nadal faces plays the third-seeded Rudd. WATCH | Auger-Aliassime downs top seed in straight sets: Auger-Aliassime earned his way to Turin with an impressive 16-match win streak, winning three of the final four ATP Tour events of the year.