Dubai, United Arab Emirates (SportsNetwork.com) - Former champion Agnieszka Radwanska was sent packing, while three former world No. 1s, including Caroline Wozniacki and Venus Williams, reached the quarterfinals at the $2 million Dubai Tennis Championships.

Capable Italian Flavia Pennetta knocked out the second-seeded 2012 champion Radwanska, 6-4, 6-1, on the hardcourts at Dubai Tennis Stadium.

Meanwhile, the eighth-seeded 2011 Dubai titlist Wozniacki handled German Annika Beck 6-4, 6-4 and the 2009 and 2010 Dubai champion and seven-time Grand Slam winner Williams drilled fellow former top-ranked star Ana Ivanovic 6-2, 6-1.

In other second-round action involving seeds, Romanian Sorana Cirstea took out fourth-seeded Sara Errani 6-2, 5-7, 6-1 and fifth-seeded former world No. 1 Jelena Jankovic doused Czech Lucie Safarova 7-5, 6-4. Errani was last year's Dubai runner-up to Petra Kvitova.

Also on Day 3, France's Alize Cornet took care of Belgian Kirsten Flipkens 6-3, 6-4.