| Champ: |  Novak Djokovic |
| Runner: |  Rafael Nadal |
| Score: | 6–3, 6–4 |
| Type: | singles doubles |
See main article: 2013 ATP World Tour Finals.
Defending champion Novak Djokovic defeated Rafael Nadal in the final, 6–3, 6–4 to win the singles tennis title at the 2013 ATP World Tour Finals. It was his third Tour Finals title.
Nadal was attempting to complete the career Super Slam. This remains his most recent final at the event.
Stanislas Wawrinka made his debut at the event.
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, or of games won initially to sort out a superior/inferior player, then head-to-head records; 5. ATP rankings
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, or of games won initially to sort out a superior/inferior player, then head-to-head records; 5. ATP rankings