Mona Barthel and Chanelle Scheepers will contest the Swedish Open title in Bastad after winning their semi-final matches on Saturday.
Germany's Barthel took three sets to come through a tight contest against Spain's Silvia Soler-Espinosa 6-2 4-6 7-5.
Scheepers' victory was more comfortable as the South African beat Slovakia's Jana Cepelova 7-5 6-2.
World No 61 Barthel is ranked 30 places higher than Scheepers and will be going for her third WTA title having won at Hobart in 2012 and the Paris Indoors last year.
Scheepers won her only title in Guangzhou, China, at the end of 2011, and leads their head-to-head 2-1, although Barthel won their last clash when they met in Hobart in January 2013.