The women's tennis world number two Serena Williams is into the quarter-finals at the Toronto Cup WTA tournament in Canada after a straight sets win over Alona Bondarenko whose sister Kateryna had earlier knocked out Serena's sister Venus.
But Kateryna Bondarenko's run ended at the hands of the 14th-seeded Pole Agnieszka Radwanska, who won in straight sets.
Australia's Samantha Stosur beat Virginie Razzano and will play the fourth-seed Elena Dementieva, who took three sets to beat Shahar Peer.
Radwanska will face either the seventh-seeded Vera Zvonareva or the former world number one Maria Sharapova.
Aravane Rezai couldn't repeat after her upset win over Dinara Safina, falling to Alisa Kleybanova\, who'll play Kim Clijsters or Jelena Jankovic.
