Wta finals
Bertens stuns world number one Barty in WTA Finals
Bertens won 3-6, 6-3, 6-4 in two hours and nine minutes in a see-saw match featuring 12 breaks of serve.
Stephens stayed calm throughout the contest, adopting a patient approach from the baseline before unleashing her devastating forehand to keep her Japanese opponent pinned at the back of the court.
Osaka stunned Serena Williams in straight sets to claim her and Japan’s first ever Grand Slam title in New York last month.
The Romanian is the only player to have qualified for all five editions of the event since it has been held in Singapore and will look to win the title for the first time.
Caroline Garcia produced a stunning comeback to overcome Caroline Wozniacki and advance to the last four at WTA Finals.
The retirement will be Hingis’s third in a long and illustrious career during which she claimed 25 grand slam titles since her WTA Tour debut in 1994.
Caroline Wozniacki produced an almost perfect display to dismantle world number one Simona Halep at the WTA Finals.
Venus Williams produced a vintage display full of guts and determination to grind out a victory over Jelena Ostapenko in their White Group encounter at the WTA Finals.
All eight women competing at the WTA Finals will go into the tournament believing they have a genuine chance of finishing the season on a high note when round-robin play starts on Sunday.
Maria Sharapova needed to win in straight sets to stand any chance of advancing to the semi-finals.