Montreal: Serena and Venus Williams will clash in the semi-finals of the Montreal WTA tournament after the American sisters battled through tough three-setters in the quarter-finals on Friday.


Venus and Serena Williams

World number one Serena outlasted Caroline Wozniacki to clinch a 4-6, 7-5, 7-5 victory, while Venus also came from a set down to end the run of Spanish 14th seed Carla Suarez Navarro, the third round conqueror of Maria Sharapova, 4-6, 6-2, 6-3.