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

Mboko opened with a win over 79th-ranked Kimberly Birrell, then upset 23rd seed and former Grand Slam champion Sofia Kenin before snapping Marie Bouzkova’s seven-match winning streak with a relentless comeback and taking down Gauff, dropping one set the whole way.

Canadian teenager Victoria Mboko delivered the biggest victory of her career on Saturday when she dominated top-seeded Coco Gauff 6-1, 6-4 to advance to the quarterfinals of the National Bank Open at Montreal.