| Champ: | Roger Federer |
| Runner: |  Jo-Wilfried Tsonga |
| Score: | 6–3, 6–7(6–8), 6–3 |
| Type: | singles doubles |
See main article: 2011 ATP World Tour Finals. Defending champion Roger Federer defeated Jo-Wilfried Tsonga in the final, 6–3, 6–7(6–8), 6–3 to win the singles tennis title at the 2011 ATP World Tour Finals. It was a then-record sixth Tour Finals title and his 70th career title.[1]
Mardy Fish and Janko Tipsarević (as an alternate who replaced Andy Murray) made their debuts 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; 5. steering-committee decision.
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; 5. steering-committee decision.