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Sydney, Australia (SportsNetwork.com) - Top-seeded and defending champion Agnieszka Radwanska and former world No. 1 Caroline Wozniacki were ousted in the second round at the Sydney International tennis event on Tuesday, while former Wimbledon titlist Petra Kvitova moved on.

Radwanska was dominated in a 7-5, 6-2 loss to American qualifier Bethanie Mattek-Sands, while Czech Lucie Safarova took out the sixth-seeded Wozniacki 6-4, 7-6 (9-7) on the hardcourts at NSW Tennis Centre.

Meanwhile, the second-seeded Kvitova blitzed American qualifier Christina McHale 6-1, 6-0, third-seeded Sara Errani dismissed American qualifier Lauren Davis, 7-5, 6-2, and fifth-seeded German Angelique Kerber had little trouble in a 6-3, 6-4 victory over Estonian Kaia Kanepi.

American Madison Keys was a 6-0, 3-6, 7-6 (7-3) winner against Croatian wild card Ajla Tomljanovic, while Spain's Carla Suarez Navarro grabbed a 7-6 (7-4), 6-3 win against Ekaterina Makarova of Russia, and Bulgarian qualifier Tsvetana Pironkova blitzed American lucky loser Varvara Lepchenko 6-3, 6-2.

Wednesday's quarterfinals will pit Kvitova against Safarova, Errani versus Pironkova, Kerber against Suarez Navarro, and Mattek-Sands versus her fellow American Keys.

This is the final tune-up for the Australian Open. The first Grand Slam event of 2014 is set to get underway Monday in Melbourne.

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