Late entry Kiki Bertens stunned world number one Ashleigh Barty with a comeback three-set victory to shake-up the season-ending WTA Finals in Shenzhen Tuesday.

All four players can still qualify from Red Group after Belinda Bencic's three-set victory over Petra Kvitova in the later match. The world No.10 won 3-6, 6-3, 6-4 in two hours and nine minutes in a see-saw match featuring 12 breaks of serve.

Copyright Agence France-Presse, 2019