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Defending champion Petra Kvitova was upset by qualifier and Czech compatriot Lucie Hradecka 6-4, 6-3 in the second round of the Madrid Open on Wednesday.
World No 1 Victoria Azarenka, who lost to Kvitova in last year's final of the premier clay event, claimed her place in the quarter-finals with a 6-4, 6-4 success against Ana Ivanovic of Serbia.
Belarussian Azarenka, winner of four titles this year including her first Grand Slam singles at the Australian Open, needed four match points to finish off a stubborn Ivanovic and will play China's Li Na for a place in Friday's semi-finals.
Li, the French Open champion and eighth seed, beat 12th-seeded German Angelique Kerber 7-5, 6-4.
Ivanovic, who has never been past the second round in two previous appearances in the Spanish capital, made a strong start on the blue clay of the Manolo Santana show court and conjured an early break of the Azarenka serve.
However, she tripped up at crucial moments during the remainder of the match and failed to convert three break points in the final game.
"I think she started really strong and I was a bit too slow and not aggressive enough," Azarenka, who hired another former number one, Frenchwoman Amelie Mauresmo, as an adviser last month, said.
"I was just trying to stay in there and execute better and get some rhythm into the match," she added.
MADRID SPRINGBOARD
Samantha Stosur of Australia, the fifth seed, also made it through to the last eight when she thrashed Czech Petra Cetkovska 6-3, 6-2 to set up a meeting with Hradecka or Russia's Ekaterina Makarova.
Kvitova, the World No 4 and seeded third this year, used her 2011 success in Madrid as a springboard for a first Grand Slam singles title at Wimbledon and went on to triumph at the season-ending WTA championships.
The graceful left hander has yet to win a title in 2012, however, after claiming six last season, and had her serve broken five times by Hradecka, who is ranked 105th in the world and claimed a first win against a top 10 player of her career.
There were no such problems for Agnieszka Radwanska of Poland, who leap-frogged Kvitova to number three in the latest rankings, in her second-round match against Sara Errani.
Radwanska snapped Errani's 16-match winning streak on clay, which netted her titles in Acapulco, Barcelona and Budapest, with a dominant performance, crushing the Italian 6-0, 6-1 to set up a third-round meeting with another Italian, Roberta Vinci.
Ninth-seeded American Serena Williams, making her first appearance in Europe this year, plays her third-round match against fellow former number one Caroline Wozniacki of Denmark, the sixth seed, on Thursday.
Photograph: Jasper Juinen / Getty Images
