After Alexander Zverev took home the trophy last year, who will finish on top this time around?
Roger Federer, Novak Djokovic, Dominic Thiem and Matteo Berrettini form Group Bjorn Borg.
The current world No 1, Rafael Nadal sits alongside Daniil Medvedev, Stefanos Tsitsipas and last year's defending champion Alexander Zverev in Group Andre Agassi.
The ATP Final is the last tournament of the year before the Slam rotation starts over in Australia on January 20, 2020. It pits two teams of top-ranking players against each other in round-robin style match play, and the winner will earn the number 1 seeded spot.