Victoria Mboko didn’t even have a picture on the Women’s Tennis Association (WTA) website before the Canadian Open in Montreal. Now, the 18-year-old has defeated four-time grand slam champion Naomi Osaka in the first WTA Tour final of her career.

Canadian teenager Victoria Mboko completed a dream run to the National Bank Open title Thursday night, overcoming a slow and swollen right wrist start to beat Japanese star Naomi Osaka 2-6, 6-4, 6-1.

Osaka joined Mboko in pulling out of the main tuneup for the U.S. Open after their gripping contest in Montreal.