Victoria Mboko, just 18 and ranked No. 85, stunned No. 1 seed Coco Gauff in straight sets to become the youngest Canadian quarterfinalist at the Omnium Banque Nationale in nearly four decades.

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, ...