Mathieu, ranked 39th in the world, defeated Uruguayan qualifier Pablo Cuevas 4-6, 6-3, 7-5 while Davydenko edged past Spaniard David Ferrer 7-5, 7-6.
Mathieu'll be looking for his fifth career title. Mathieu holds a 2-0 career edge over Davydenko, who also has not won a title this year.