The Elite Eight qualifiers are Angelique Kerber (#1), Dominika Cibulkova (#8) Simona Halep (#4) and Madison Keys (#7) in the Red group and Agnieska Radwanska (#3), Garbine Muguruza (#6), Karolina Pliskova (#5) and Svetlana Kuznetsova (#9) in the White group. The draw is made so that the two groups play a round-robin and the top 2 finishers n each group play semifinals against a player from the other group to reach the final. Last year's final four was Maria Sharapova, Muguruza, Radwanska and Petra Kvitova. Kvitova and Radwanska reached the final, which, amazingly, was won by Radwanska. This year Kvitova did not even qualify for the Top 8 and is just outside the Top 10.
Interestingly, despite qualifying late, Kuznetsova has a very good record against the rest of the players in her half of the draw (13-6, mostly because of a 12-4 head-to-head against Radwanska!). Kerber has a 12-9 advantage and Halep has a 10-7 advantage against the rest of the players in the Red group. My prediction would be a Kuznetsova-Kerber semifinal and a Radwanska-Halep semifinal