Victoria Mboko, the 18-year-old Canadian tennis player, defeated champion Coco Gauff at the Canadian Open in Montreal on Saturday.

This time last year, Mboko was ranked outside the top 300. Now, the 18-year-old Canadian is into the quarterfinals of her home tournament.

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.