Caroline Garcia rallied from a set down to beat Daria Kasatkina 4-6, 6-1, 7-6 (7/5) on Saturday in a winner-take-all clash that sent the French player into the WTA Finals knockout phase.
The clash for the last semi-final berth was tense and action-packed, Garcia shaking off the frustration of the first set then holding on in the tightly contested third to line up a meeting with fifth-ranked Greek Maria Sakkari.
Round robin play concluded with world number one Iga Swiatek, already assured of her semi-final berth, defeating American teenager Coco Gauff 6-3, 6-0, who was eliminated from semi-final contention on Thursday.
Swiatek, winner of the French Open and US Open this year, will face seventh-ranked Aryna Sabalenka in the semis at Dickies Arena.