Serena Williams withdrew from Singapore for the second straight year just a few days before the start of the WTA Finals, leaving the eighth and final spot wide open.
Johanna Konta, Carla Suarez Navarro and Svetlana Kuznetsova are battling it out for that coveted berth. Before Williams withdrew, Dominika Cibulkova had claimed that final spot by winning the title in Linz.