Victoria Mboko earned the biggest win of her young career with a dominant win over No. 1 seed Coco Gauff of the United States to reach the National Bank Open quarterfinals in Montreal. The 18-year-old from Toronto is having a breakthrough season after starting the year ranked outside the top 300.

Victoria Mboko’s stellar run at the National Bank Open hit a new level Saturday. The Canadian rolled to a 6-1, 6-4 victory over No. 1 seed Coco Gauff of the United States, winning the women’s singles match in just 62 minutes to advance to the quarterfinals at the WTA 1000 tournament.

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.