Singles – Group Guga Kuerten
 Alexander Zverev (GER)
 Marin Cilic (CRO)
 John Isner (USA)
Singles – Group Lleyton Hewitt
 Roger Federer (SUI)
 Kevin Anderson (RSA)
 Dominic Thiem (AUT)
 Kei Nishikori (JPN)
Djokovic, a five-time year-end No. 1, leads Group Guga Kuerten alongside Alexander Zverev (1-1 FedEx ATP Head2Head record), Marin Cilic (Djokovic leads 16-2) and John Isner (Djokovic leads 8-2). Djokovic, who has a 49-11 match record in 2018, including a 31-2 mark since the start of Wimbledon, has qualified for the season finale for the 11th time (2007-16), highlighted by five title runs in 2008 (d. Davydenko), 2012 (d. Federer), 2013 (d. Nadal) and 2014-15 (d. Federer both times).
Federer, a six-time former champion at the prestigious event, has compiled a 46-8 match record in 2018, including four titles. The Swiss has been drawn in Group Lleyton Hewitt with Kevin Anderson (4-1 FedEx ATP Head2Head record), Dominic Thiem (Thiem leads 2-1) and Kei Nishikori (Federer leads 7-2).
Eight different countries are represented in the elite eight-man singles field for the third consecutive year. Gustavo Kuerten won the 2000 season finale, when the event was held in Lisbon, while Lleyton Hewitt won two titles in 2001 (in Sydney) and 2002 (in Shanghai).
Karen Khachanov, who beat Djokovic for his first ATP World Tour Masters 1000 title on Sunday at the Rolex Paris Masters, and Borna Coric are first and second alternates respectively in the singles field.
The two doubles groups will be published later today.