World number one Ashleigh Barty has been drawn in the same group as Naomi Osaka at the WTA Finals in Shenzhen.
French Open champion Barty and Australian Open winner Osaka will be joined by Petra Kvitova and Belinda Bencic in the Red Group.
The Purple Group includes US Open champion Bianca Andreescu, Wimbledon winner Simona Halep, Karolina Pliskova and Bianca Andreescu.
The tournament in China takes place from 27 October to 3 November.
Barty, who won her first Grand Slam title at the French Open, heads the field on her maiden appearance, having becoming the first Australian since 1976 to be ranked world number one.