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.

Against all odds, Victoria Mboko has made Canadian tennis history. The 18-year-old Toronto product played through a wrist injury and beat Naomi Osaka 2-6, 6-4, 6-1 on Thursday in the final of the National Bank Open presented by Rogers before another sellout crowd at IGA Stadium.

The 18-year-old Canadian tennis sensation Victoria Mboko has defeated Japanese Naomi Osaka in the National Bank Open final in Montreal to win her first career WTA title. Entering the tournament via wild card entry, Mboko is ranked No. 85 in the Women’s Tennis Association ranking system.