French Open runner-up Chwalinska, who was Swiatek's junior doubles partner, will face Sonay Kartal in the final after the Briton beat Jelena Ostapenko 7-6(9) 7-6(5) in the first semi-final
Russian eighth seed Mirra Andreeva seemed to be joining Rybakina through the exit door but she regained her composure to down Spain's Marina Bassols Ribera 3-6 6-1 6-1