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

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.

An absolute surprise at the Montreal Open after Coco Gauff's defeat to young Canadian Victoria Mboko. The world No. 2 was far from her usual level, and while she managed to reduce her double faults, she had a poor 43% first-serve percentage throughout the match and ended up losing 6-1,