Grigor Dimitrov won the title, defeating David Goffin in the final, 7–5, 4–6, 6–3. Dimitrov became the first debutant to win the season-ending championship since Àlex Corretja in 1998. For the first time since 2008, two first-time finalists played for the title in the year-end event.
The top two seeds were Rafael Nadal and Roger Federer, neither of whom played in 2016. Nadal withdrew from the tournament after his first match due to a knee injury. Federer participated in the ATP year-end championships for a record-extending 15th time but lost in the semi-final to Goffin. Also, Goffin became only the fifth player in history to defeat Nadal and Federer, in the same tournament. And only the second after Nikolay Davydenko, in the ATP Finals since 2009.
Alexander Zverev, Dimitrov, Jack Sock and Pablo Carreño Busta (as an alternative replacing Nadal) made their debuts in the event. Goffin made his debut as a direct qualifier, after playing one match as an alternative in 2016.
Standings are determined by: 1) Number of wins; 2) Number of matches; 3) In two-players-ties, head-to-head records; 4) In three-players-ties, percentage of sets won, then percentage of games won, then head-to-head records; 5) ATP rankings