Paula Badosa will face Victoria Azarenka in the Indian Wells final after upsetting Ons Jabeur on Friday.
Spain's Badosa, playing the tournament for the first time, defeated 13th seed Jabeur, one of the most in-form players on the Tour this year, 6-3 6-3.
Azarenka came from a set and break down to beat Jelena Ostapenko 3-6 6-3 7-5.
The 32-year-old Belarusian will aim to become the first woman to win the tournament three times after victories in 2012 and 2016.
Jabeur saved five match points before 21st seed Badosa sealed the win when the Tunisian hit a backhand wide.