Even Victoria Mboko couldn’t believe what she achieved. It was billed as the tournament’s marquee match. A rising Canadian star — and last remaining singles hope from the host country — facing her stiffest test yet against the No.

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.

Victoria Mboko, world No. 85 and a wild card at the Canadian Open, secured the biggest win of her career Saturday night, trouncing two-time Grand Slam champion Coco Gauff 6-1, 6-4 in Montreal. This time last year,