Top seed Elena Dementieva fought back from a set down against Melanie Oudin to book her place in the final of the Open GDF Suez in Paris.
The Russian, the world No.7, conceded the first set to the American teenager but dug deep to recover for a 4-6 6-3 6-3 victory and reach the final at the hard-court event for the second year in succession.
Dementieva, who lost to France's Amelie Mauresmo in the final last year, will meet Lucie Safarova of the Czech Republic in Sunday's showpiece match.
Safarova, the world No.46, also rallied from a set down in her semi-final encounter with second-seeded Flavia Pennetta of Italy to register 4-6 6-3 6-4 triumph and book her place in the final at this event for the second time.
Sunday's match will only be the second meeting between the two players on the WTA tour. Dementieva holds the advantage in their head-to-head record, winning their only previous encounter in straight sets at the 2005 US Open.
Meanwhile, top seed Vera Zvonareva overcame a second-set slump to battle through to the Pattaya Open final.
The 25-year-old Russian, ranked 14th in the world, beat Kazakhstan's Yaroslava Shvedova 6-2 4-6 6-3.
Shvedova, the 22-year-old fourth seed, is at a career high of 48th in the WTA rankings but could not build on her success in pulling level at one set each, with Zvonareva's class telling.
In the final, Zvonareva will face Thailand's Tamarine Tanasugarn who delighted her home crowd with a victory over another player from Kazakhstan, Sesil Karatantcheva.
Tanasugarn, the 32-year-old world No.87, was almost totally dominant against Karatantcheva, beating the 185th-ranked 20-year-old 6-2 6-0.