Victoria Azarenka demolished in the quarter-final as Agnieszka Radwanska books Australian Open semi-final place Dominika Cibulkova has cruised into the semi-finals of the Australian Open, blasting 11th seed Simona Halep off the court in just an hour. Poland's Agnieszka Radwanska plays a shot during her win Belarus's Victoria Azarenka. AGNIESZKA Radwanska has picked up on the trend for upsets at the Australian Open and run with it, bundling out two-time defending champion Victoria Azarenka. The Polish No. 5 seed won 6-1, 5-7, 6-0 to earn a semi-final against Slovakia's Dominika Cibulkova, the No. 20 seed who took just an hour to thrash 11th-seeded Romanian Simona Halep 6-3, 6-0. Radwanska, playing her fifth quarter-final at Melbourne Park and fourth in a row, was thrilled to reach the last four. "I said to myself, 'I have to have one step forward into the semi-final,'" she said. I'm so very happy I did it finally. Azarenka and Radwanksa knew each other's games intimately. Both only 24, they went into their latest match having played 15 times before with Azarenka winning 12, including the previous seven. Radwanska's last victory over the Belarussian had come in Tokyo in 2011. The players had just begun the fourth game of the match and Azarenka had already amassed nine unforced errors, a figure that rose to 17 by the end of the first set. Radwanska broke her opponent twice and on set point hit a clever drop shot, forcing Azarenka to lunge at a forehand volley which slammed into the net. Radwanska had another break point in the opening game of the second set, but Azarenka managed to hold. Victoria Azarenka of Belarus shows her frustration. Radwanska broke her in the fifth game but Azarenka broke straight back and then won her next service game to love. A poor service game by Radwanska handed Azarenka three set points and the No. 2 seed converted her first with a sharp crosscourt forehand. Azarenka had her chances to hold serve in the opening game of the decider, but she failed to close it out and Radwanska, scrambling all over the court to retrieve the ball, made her pay by seizing control of the match. Radwanska could not put a foot wrong, producing some spectacular shots, especially at the net, while Azarenka's ground strokes were shaky. When a double fault handed Radwanska a 5-0 lead, the Polish player was serving for the match and she sealed victory on her first of two opportunities when Azarenka's return sailed way out.