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Dayana Yastremska
Yastremska is one of the very few WTA players to win two titles this year (Hua Hin and Strasbourg). The 19-year-old Ukrainian has shot up to No. 33 in the world after starting 2019 at No. 59. In her last event before coming to Toronto, she reached her first Grand Slam round of 16, at Wimbledon. She's scored wins over Aryna Sabalenka, Caroline Garcia, Garbine Muguruza and, on Monday in Toronto, Johanna Konta.