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.

Naomi Osaka reacts to playing Victoria Mboko in the final of the National Bank Open after Mboko called Osaka her "idol" years back.

Naomi Osaka saved herself from another close exit, closing out a narrow 6-2, 7-6 victory over Clara Tauson at the Canadian Open. The win lands Osaka a WTA 1000 Final for the first time in three years and her first WTA Tour-level final since January’s ASB Classic.