It was a rough day for Naomi Osaka, and landmark one for the Canadian teenager Victoria Mboko. Mboko, 18, came back to stun the four-time Grand Slam champion 2-6, 6-4, 6-1 in the final of the Canadian Open on Thursday, earning her the first WTA title of her career in front of a home crowd.

Naomi Osaka struggled to build upon an early edge in her matchup with Victoria Mboko in the 2025 Montreal Open Final.

Victoria Mboko is the National Bank Open women's singles champion. The 18-year-old from Toronto defeated Naomi Osaka of Japan 2-6, 6-4, 6-1 at IGA Stadium in Montreal on Thursday.