Top seed Petrova out

Top seed Nadia Petrova has departed the Bell Challenge at the quarter-final stage after retiring from her match against Melinda Czink.

Russian retires in Quebec City

Top seed Nadia Petrova has departed the Bell Challenge at the quarter-final stage after retiring from her match against Melinda Czink in Quebec City. The fifth seeded Czink had taken a first-set tie-break before her Russian opponent withdrew citing a viral illness. The Hungarian now plays home hope Aleksandra Wozniak for a place in Sunday's final. Wozniak, meanwhile, had an easy passage through to the semi-finals, defeating Russia's Alla Kudryavtseva 6-1 6-1. Saturday's second semi will be contested by fourth seed Lucie Safarova of the Czech Republic and Germany's Julia Goerges. Safarova beat American wild card Bethanie Mattek-Sands in straight sets while Goerges dispatched American qualifier Lilia Osterloh 6-2 6-4.