MONTREAL (Canada) (AFP) Reigning US Open champion Kim Clijsters cruised into the quarter-finals of the two million-dollar WTA Montreal Cup on Thursday by defeating Estonias Kaia Kanepi 6-2, 6-1. The Belgian fifth seed, who won her third title of the year last week at Cincinnati, took just 55 minutes to reach a quarter-final Friday against Russian eighth seed Vera Zvonareva, who beat Hungarys Agnes Szavay 6-3, 6-3. One night after a three-set battle with American Bethanie Mattek-Sands in her first match since a three-set Cincinnati final against Maria Sharapova, Clijsters was pleased she advanced with relative ease. I was playing an opponent who could not miss a shot while today Kanepi was missing a lot, especially since her strengths are usually her serve and her backhand, Clijsters said. I really felt that I had opportunities once I was in a rally with her and she was either going to make a mistake or I could really try to make her move. Its always nice to win a tournament and gradually feel your level improve and also to have a matches like (Mattek-Sands) and in Cincinnati - to be behind and fight back and win. Zvonareva took her only career victory over Clijsters at this years Wimbledon quarter-finals. We always had tough matches, Zvonareva said. I never managed to beat her and finally at Wimbledon I was able to play consistently. I always believe I could beat anyone on the other side of the net. Clijsters , who rose to fourth in the WTA rankings released Monday, ended a two-year layoff to start a family last year at Cincinnati and went on to win her second Grand Slam title at the US Open, which she also won in 2005. Clijsters seeks a 39th career singles crown at the final major hardcourt tuneup for this years US Open and bids for her fourth title of 2010, having already won at Brisbane and Miami in addition to last week. Danish world number two Caroline Wozniacki advanced to the last eight by ousting Italys Flavia Pennetta 4-6, 6-3, 6-1. She will next face Italian sixth seed Francesca Schiavone, who eliminated Russias Dinara Safina 6-4, 6-3. Russias Svetlana Kuznetsova saved five of six break points she faced in the third set to defeat Polish seventh seed Agnieszka Radwanska 6-4, 1-6, 6-3. The victory advanced Kuznetsova into a quarter-final match against Chinas Zheng Jie, who upset Russian fourth seed Elena Dementieva 7-6 (7/3), 6-4. Frances Marion Bartoli and Victoria Azarenka of Belarus will meet in another Friday quarter-final after each advanced in straight sets. Bartoli eliminated Czech qualifier Iveta Benesova 6-0, 6-1, after Benesova had earlier ousted Serbian top seed Jelena Jankovic. Azarenka defeated Chinas ninth-seeded Li Na 6-3, 6-3. Li had moved into a first-round bye position after third seed Venus Williams withdrew with a leg injury.