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-, 6-4, 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.

Canadian teenager Victoria Mboko completed a dream run to the National Bank Open title Thursday night, overcoming a slow start to beat Japanese star Naomi Osaka 2-6, 6-4, 6-1.

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.