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

Gauff, the 21-year-old world No. 2, survived another day of subpar serving and scraped herself off the pavement of the Canadian Open to win her second consecutive three-set match, beating Veronika Kudermetova of Russia 4-6, 7-5, 6-2. It was Gauff’s ninth win in 10 three-set matches this season.

Aug 2 (Reuters) - 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.