The ATP Finals group stage has a round-robin format, with eight players/teams divided into two groups of four and each player/team in a group playing the other three in the group.

The eight seeds were determined by the ATP rankings and ATP Doubles Team Rankings on the Monday after the last ATP Tour tournament of the calendar year.

All singles matches, including the final, were best of three sets with tie-breaks in each set including the third. All doubles matches were two sets (no ad) and a Match Tie-break.

In deciding placement within a group, the following criteria were used, in order:

1. Most wins.
2. Most matches played (e.g., a 2–1 record beats a 2–0 record).
3. Head-to-head result between tied players/teams.
4. Highest percentage of sets won.
5. Highest percentage of games won.
6. ATP rank after the last ATP Tour tournament of the year.

Criteria 4–6 were used only in the event of a three-way tie; if one of these criteria decided a winner or loser among the three, the remaining two would have been ranked by head-to-head result.

The top two of each group advanced to semifinals, with the winner of each group playing the runner-up of the other group. The winners of the semifinals then played for the title.