Three-time defending champion Novak Djokovic defeated Roger Federer in the final, 6–3, 6–4 to win the singles tennis title at the 2015 ATP Finals. It was his fifth Tour Finals title. With the win, Djokovic became the first player to win the event four consecutive times.^[1]

	Semifinals							Final
	3	Roger Federer	7	6
	4	Stan Wawrinka	5	3
								3	Roger Federer	3	4
								1	Novak Djokovic	6	6
	5	Rafael Nadal	3	3
	1	Novak Djokovic	6	6

		Djokovic	Federer	Berdych	Nishikori	RR W–L	Set W–L	Game W–L	Standings
1	Novak Djokovic		5–7, 2–6	6–3, 7–5	6–1, 6–1	2–1	4–2 (66.7%)	32–23 (58.2%)	2
3	Roger Federer	7–5, 6–2		6–4, 6–2	7–5, 4–6, 6–4	3–0	6–1 (85.7%)	42–28 (60%)	1
6	Tomáš Berdych	3–6, 5–7	4–6, 2–6		5–7, 6–3, 3–6	0–3	1–6 (14.3%)	28–41 (40.6%)	4
8	Kei Nishikori	1–6, 1–6	5–7, 6–4, 4–6	7–5, 3–6, 6–3		1–2	3–5 (37.5%)	33–43 (43.4%)	3

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.

		Murray	Wawrinka	Nadal	Ferrer	RR W–L	Set W–L	Game W–L	Standings
2	Andy Murray		6–7(4–7), 4–6	4–6, 1–6	6–4, 6–4	1–2	2–4 (33.3%)	27–33 (45.0%)	3
4	Stan Wawrinka	7–6(7–4), 6–4		3–6, 2–6	7–5, 6–2	2–1	4–2 (66.7%)	31–29 (51.7%)	2
5	Rafael Nadal	6–4, 6–1	6–3, 6–2		6–7(2–7), 6–3, 6–4	3–0	6–1 (85.7%)	42–24 (63.6%)	1
7	David Ferrer	4–6, 4–6	5–7, 2–6	7–6(7–2), 3–6, 4–6		0–3	1–6 (14.3%)	29–43 (40.3%)	4

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.

• Main draw