The Russian will play South Africa's Chanelle Scheepers, who knocked out Urszula Radwanska of Poland, 4-6, 7-6 (6), 6-3, in a match that lasted over 3 hours.
The other semifinal will be between Magdalena Rybarikova of Slovakia, who beat defending champion Jarmila Gajdosova of Australia, 6-4, 6-3, and the last Chinese player in the tournament, Zheng Jie. She defeated Petra Martic of Croatia 1-6, 6-4, 6-3.
Zheng, ranked 15th in 2009, has slipped to 83rd after missing the first two months of the year with a wrist injury.
In Bucharest, Romania, Florian Mayer advanced to the quarterfinals of the Nastase Tiriac Trophy on Thursday, defeating Carlos Berlocq of Argentina 6-2, 0-6, 6-4.
The second-seeded German will meet Albert Ramos of Spain, who beat Pere Riba 2-6, 6-4, 7-5.
Fourth-seeded Pablo Andujar of Spain, who lost in last year's final, beat Marius Copil of Romania 6-2, 6-3, while third-seeded Marcel Granollers of Spain lost to Filippo Volandri of Italy 6-1, 6-3.
In Seoul, Julia Goerges of Germany and Spain's Maria-Jose Martinez Sanchez both advanced to the quarterfinals of the Korea Open on Thursday and will meet each other in the next round.
The third-seeded Goerges defeated Eleni Daniilidou of Greece 6-4, 7-5, while the sixth-seeded Martinez beat Kristyna Pliskova of the Czech Republic 7-6 (5), 6-2 at the Olympic Park.
Also, Vera Dushevina of Russia defeated Alexandra Dulgheru of Romania 6-3, 6-1, and Galina Vokoboeva of Kazakhstan beat Iveta Benesova of the Czech Republic 6-4, 6-4.
In Metz, France: Dutch qualifier Igor Sijsling eliminated seventh-seeded Philipp Kohlschreiber of Germany 6-4, 7-5 on Thursday to advance to the quarterfinals of the Moselle Open.
Sijsling hit 10 aces on his way to victory and broke Kohlschreiber once in each set.
Sxith-seeded Xavier Malisse of Belgium also advanced with a 6-4, 6-2 win over Igor Kunitsyn of Russia.
Malisse will play third-seeded Alexandr Dolgopolov of Ukraine, while Sijsling will face fourth-seeded Ivan Ljubicic of Croatia.
