Wozniacki, Zvonareva fail in Sydney International

SYDNEY: Top-ranked Caroline Wozniacki and Vera Zvonareva crashed out of the Sydney International on Tuesday, leaving them short of vital match practice ahead of next week's Australian Open.

Denmark's world number one Wozniacki was knocked out by Slovakia's 32nd-ranked Dominika Cibulkova 6-3, 6-3 in one hour 40 minutes and was followed out of the tournament by Russian Zvonareva on a rain-interrupted day.

Second-ranked Zvonareva fell to Italian Flavia Pennetta 7-5 7-5, leaving US Open champion third-seeded Kim Clijsters as the highest-ranking seed left in the tournament.

Clijsters cruised into the quarter-finals with a 6-1, 6-4 victory over Czech Barbora Zahlavova Strycova.

While Clijsters was contemplating a match against seventh seed Victoria Azarenka, Wozniacki and Zvonareva were hastily arranging extra practice to make up for their lack of match play heading into Monday's season-opening Grand Slam.

Zvonareva said she struggled to adapt to the windy wet conditions after arriving late Sunday from Hong Kong.

While Wozniacki and Zvonareva have their problems, it was a much smoother start to the season for Belgium's Clijsters.

Azarenka eased into the last eight with a 7-5, 6-3 win over Israel's Shahar Peer.

China's Li Na won her second match of the tournament, accounting for French qualifier Virginie Razzano, 6-4, 1-6, 6-4 and will next play former French and US Open champion Svetlana Kuznetsova.

The Russian came back from dropping the opening set to beat home favourite and fourth seed Samantha Stosur, 3-6, 6-3, 6-4.

Russian Alisa Kleybanova will take on Cibulkova in the quarters after overcoming Spaniard Maria Jose Martinez Sanchez 6-2, 6-4.