Her opponent will be Lucie Safarova after the Czech whitewashed Slovenia's Polona Hercog 6-0 6-0.
The 2011 Wimbledon champion will be joined by 23rd-ranked Lucie Safarova, and doubles partners Andrea Hlavackova and Lucie Hradecka.
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Her next opponent is unseeded Ukrainian Alona Bondarenko, who battled past Lucie Safarova of the Czech Republic 5-7 6-4 7-5.
American Christina McHale earned a surprise 6-2 6-4 win over Czech 24th seed and 2007 Australian Open quarterfinal Lucie Safarova.
Seventh seed Marion Bartoli awaits Ivanovic in the last eight, following the Frenchwoman's win over Czech No. 23 Lucie Safarova.
She will next play 31st seed Lucie Safarova , who beat Klara Zakopalova of the Czech Republic 6-3 6-7 (2-7) 7-5.
The world No. 26 will next play fellow left-hander Lucie Safarova after the Czech upset Polish eighth seed Agnieszka Radwanska 1-6 6-3 7-6 (7-2).
Estonian 15th seed Kaia Kanepi suffered a 6-3 7-6 (7-4) reverse against Czech Lucie Safarova, who earned a second-round clash with Ukrainian Alona Bondarenko.
Former Wimbledon champion Kvitova beat 168th-ranked Jarmila Gajdosova 7-6 (7-2) 6-3, then world No. 18 Safarova upset No. 9 Samantha Stosur 7-6 (8-6) 7-6 (7-4).
Clijsters faces a quarterfinal against either Alexsandra Wozniak or Lucia Safarova.
Fourth seed Angelique Kerber came through in three sets against Georgia's Anna Tatishvili, while her fellow German Sabine Lisicki beat Czech Lucie Safarova 6-2 6-4.
But her service was broken four times by Safarova, who has been in fine form on clay this season with quarterfinal appearances at Stuttgart and Rome.
Martinez Sanchez, who knocked out world No. 2 Caroline Wozniacki on Wednesday, progressed into the last four by defeating unseeded Czech Lucie Safarova 7-6 (8-6) 6-4.
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China's 2011 French Open champion will play Safarova's compatriot Petra Kvitova in Monday's final, after last year's Wimbledon winner defeated former world No. 1 Caroline Wozniacki.
Clijsters will place Czech Lucie Safarova for a place in the semifinals after she beat sixth seed Aleksandra Wozniak of Canada 6-3 6-1 earlier on Wednesday.
After being taken the distance by Lucie Safarova and Ana Ivanovic in the previous two rounds, Sharapova dominated the first set of the semifinal breaking Kerber twice.
The sixth seed defeated Czech Lucie Safarova 6-2 6-2, her 27th win in 28 encounters with left-handed players, to set up a clash with unseeded Austrian Sybille Bammer.
Clijsters, meanwhile, was also made to work hard in her quarterfinal but eventually edged a rollercoaster clash with Lucie Safarova 6-1 0-6 6-4 at the Pat Rafter Arena.
The Belgian world number 18 broke her opponent twice en route the first set, but five double faults in the second helped Safarova get back on level terms.
The Czech Republic, seeking a third consecutive title, lost 3-1 in Palermo as Roberta Vinci clinched the decisive point with a 6-3 6-7 (2-7) 6-3 win over Lucie Safarova.
Petrova will now meet Czech Lucie Safarova or Romanian Alexandra Dulgheru in the quarterfinals while Serena has had her preparations for the French Open later this month cut short.
Dementieva eventually secured a 6-7 (5-7) 6-1 6-4 victory over Safarova to go one better than last year when she lost to home hope and now retired Amelie Mauresmo.
Safarova didn't leave Charleston empty-handed, however, securing her first WTA doubles title alongside Russia's Anastasia Pavlyuchenkova as they beat Spaniards Anabel Medina Garrigues and Yaroslava Shvedova 5-7 6-4 10-6.
Anna-Lena Groenefeld put Germany ahead in Brno with a 6-2 6-2 victory over Lucie Safarova, but Petra Kvitova leveled for the hosts with a 6-4 6-4 win against Andrea Petkovic.
Italian No.1 Pennetta was due to have met Lucie Safarova, but her Czech counterpart was relegated to the bench after crashing 6-0 6-2 to Francesca Schiavone in her first singles rubber.
Meanwhile, Petra Kvitova and Lucie Safarova gave Fed Cup champions the Czech Republic a 2-0 lead over Australia after the first day of their World Group tie in Ostrava on Saturday.
Top seed and French Open champion Maria Sharapova later struggled through against Czech Lucie Safarova, prevailing 6-4, 6-7 6-3 in their second round match and her opener in the defense of the Stuttgart crown.
In the women's draw, Li Na ensured she will return to the top 10 of the world rankings by coming back from 5-1 down in the final set to beat Lucie Safarova 3-6 6-3 7-5.
Lucie Safarova beat 2010 French Open champion Francesca Schiavone 7-6 (7-3) 6-1 in Ostrava, then world No. 3 Petra Kvitova defeated Sara Errani 6-4 6-3 to leave the home side needing only one win on Sunday.
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