Azarenka was a 6-2, 6-3 winner over Schiavone, setting up a quarterfinal meeting with either Urszula Radwanska or Jelena Jankovic. Radwanska and Jankovic will meet in the second round Thursday.
Vinci had little trouble getting past Bethanie Mattek-Sands 6-4, 6-2, Kvitova was a 6-1, 6-2 winner over Laura Robson and Stosur ousted Sesil Karatantcheva 6-4, 6-1.
Man spent 15 hours in jail for plugging electric car into an outlet at a school
Florida bear attack: Black bear mauls woman's face