Ons Jabeur and Garbine Muguruza will contest the Chicago Fall Tennis Classic final after both won their semi-finals on Saturday.
Jabeur, currently ranked No.16, led Elena Rybakina 6-4, 3-2 when Rybakina retired with an unknown illness.
And Muguruza advanced without playing a point after Marketa Vondrousova withdrew in the morning because of a gastrointestinal illness.
