UPDATE 2-Tennis-Toronto Cup women's quarter-final results

Aug 12 (Reuters) - Toronto Cup women's singles quarter-final results from Canada on Friday (prefix denotes seeding, * new result)

 Serena Williams (U.S.) beat Lucie Safarova (Czech Republic)
4-6 6-3 6-2  
* 13-Agnieszka Radwanska (Poland) beat 11-Andrea Petkovic
(Germany) 6-4 6-3
4-Victoria Azarenka (Belarus) beat Galina Voskoboeva
(Kazakhstan) 6-1 6-2
10-Samantha Stosur (Australia) beat Roberta Vinci (Italy) 6-4
6-1