Canadian teenager Victoria Mboko upset top-seeded Coco Gauff 6-1, 6-4 on Saturday night to reach the National Bank Open quarterfinals.

Coco Gauff was once again denied a berth in the semifinal of the Canadian Open. This time, the opponent was teen sensation Victoria Mboko, who breezed past the two-time Grand Slam singles champion with a 6-1, 6-4 scoreline.

This time last year, Mboko was ranked outside the top 300. Now, the 18-year-old Canadian is into the quarterfinals of her home tournament.