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

Four-time Grand Slam champion Naomi Osaka lost a lot of fan support Thursday night for how she behaved during the National Bank Open final. After Osaka won the opening set over 18-year-old Victoria Mboko,

Playing in her first WTA 1000 final since 2022, the Japanese made an outstanding start to the Montreal title match and took the opening set versus Canadian wildcard Victoria Mboko with a 6-2 scoreline. But then, the former world No. 1's level dropped and the 18-year-old teenage sensation went on to complete a 2-6 6-4 6-1 win.