Riske ousts Kvitova in National Bank Open first round

Alison Riske of the USA beat Czech left-hander Petra Kvitova 6-2, 4-6, 6-3 in round one of the National Bank Open at the Aviva Centre in Toronto on Tuesday night.

Riske, ranked No 35, will face No 16 seed Jelena Ostapenko on Wednesday.

WTA Toronto, other first-round matches and results:

• Daria Kasatkina vs. Bianca Andreescu
• Belinda Bencic vs. Tereza Martincova
• Amanda Anisimova vs. Carol Zhao
• Kaia Kanepi vs. Naomi Osaka
• Shuai Zhang vs. Cristina Bucsa
• Camila Giorgi vs. Emma Raducanu
• Veronika Kudermetova vs. Ajla Tomljanovic
• Madison Brengle vs. Coco Gauff
• Sara Sorribes Tormo vs. Claire Liu
• Anna Bondar vs. Elise Mertens
• Rebecca Marino vs. Qinwen Zheng
• Jil Teichmann vs. Venus Williams
• Yulia Putintseva beat Katherine Sebov (WC): 3-6, 6-2, 7-5
• Leylah Fernandez (13) beat Storm Sanders (Q): 6-4, 6-7(2), 6-3
• Alize Cornet beat Caroline Garcia: 3-6, 6-3, 6-3
• Asia Muhammad (Q) beat Madison Keys: 7-6(5), 6-4
• Sloane Stephens beat Sofia Kenin: 6-2, 6-7(5), 7-5
• Karolina Pliskova (14) beat Barbora Krejcikova: 6-3, 6-4
• Jelena Ostapenko beat Anhelina Kalinina: 6-4, 6-2
• Serena Williams beat Nuria Parrizas Diaz (LL): 6-3, 6-4
• Simona Halep (15) beat Donna Vekic (LL): 6-0, 6-2
• Elena Rybakina beat Marie Bouzkova (Q): 7-5, 6-7(3), 6-1
• Beatriz Haddad Maia beat Martina Trevisan: 6-2, 2-6, 6-2