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

Canadian teenager Victoria Mboko earned the biggest win of her career on Saturday, beating top seed Coco Gauff 6-1 6-4 to reach the quarterfinals of the Canadian Open in Montreal. Mboko dropped her racket and covered her face in disbelief as the packed crowd leapt to their feet after the 18-year-old tournament wild card sealed the victory in just over an hour.

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.