Singles
1991 ATP Tour World Championships
Final
Champion	Pete Sampras
Runner-up	Jim Courier
Score	3–6, 7–6(7–5), 6–3, 6–4
Details
Draw	8
Events
Singles Doubles
← 1990 · ATP Finals · 1992 →

Pete Sampras defeated Jim Courier in the final, 3–6, 7–6^(7–5), 6–3, 6–4 to win the singles title at the 1991 ATP Tour World Championships. It was his first Tour Finals title.

Andre Agassi was the defending champion, but was defeated by Courier in the semifinals.

Draw

Finals

	Semifinals							Final
	4	Ivan Lendl	2	3
	6	Pete Sampras	6	6
								6	Pete Sampras	3	7	6	6
								1	Jim Courier	6	65	3	4
	7	Andre Agassi	3	5
	1	Jim Courier	6	7

Ilie Năstase group

		Courier	Lendl	Forget	Nováček	RR W–L	Set W–L	Game W–L	Standings
1	Jim Courier		2–6, 3–6	7–6(7–4), 6–4	6–7(6–8), 7–6(7–5), 6–4	2–1	4–3	37–39	2
4	Ivan Lendl	6–2, 6–3		6–2, 6–4	6–2, 6–2	3–0	6–0	36–15	1
5	Guy Forget	6–7(4–7), 4–6	2–6, 4–6		6–3, 7–6(7–3)	1–2	2–4	29–34	3
8	Karel Nováček	7–6(8–6), 6–7(5–7), 4–6	2–6, 2–6	3–6, 6–7(3–7)		0–3	1–6	30–44	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, or of games won; 5. steering-committee decision.

John Newcombe group

		Becker	Stich	Sampras	Agassi	RR W–L	Set W–L	Game W–L	Standings
2	Boris Becker		7–6(7–1), 6–3	6–4, 6–7(3–7), 6–1	3–6, 5–7	2–1	4–3	39–34	3
3	Michael Stich	6–7(1–7), 3–6		2–6, 6–7(3–7)	5–7, 3–6	0–3	0–6	25–39	4
6	Pete Sampras	4–6, 7–6(7–3), 1–6	6–2, 7–6(7–3)		6–3, 1–6, 6–3	2–1	5–3	38–38	2
7	Andre Agassi	6–3, 7–5	7–5, 6–3	3–6, 6–1, 3–6		2–1	5–2	38–29	1

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.