Singles
1991 Monte Carlo Open
Champion	Sergi Bruguera
Runner-up	Boris Becker
Score	5–7, 6–4, 7–6(8–6), 7–6(7–4)
Draw	56 (7Q / 5WC)
Seeds	16

Sergi Bruguera defeated Boris Becker in the final, 5–7, 6–4, 7–6^(8–6), 7–6^(7–4) to win the singles tennis title at the 1991 Monte Carlo Open.

Andrei Chesnokov was the defending champion, but lost to Boris Becker in the quarterfinals.

Seeds

The top eight seeds received a bye to the second round.

Draw

Finals

	Quarterfinals							Semifinals							Final
		Magnus Gustafsson	5	5
	9	Sergi Bruguera	7	7
								9	Sergi Bruguera	6	6
									Horst Skoff	1	4
		Horst Skoff	6	6
	6	Jonas Svensson	3	3
															9	Sergi Bruguera	5	6	78	77
															2	Boris Becker	7	4	66	64
	WC	Carl-Uwe Steeb	4	2
		Goran Prpić	6	6
									Goran Prpić	3	3
								2	Boris Becker	6	6
	8	Andrei Chesnokov	1	3
	2	Boris Becker	6	6

Top half

Section 1

	First round							Second round							Third round							Quarterfinals
								1	S Edberg	7	3	63
		M Larsson	6	6					M Larsson	5	6	77
	Q	D Rikl	3	1												M Larsson	62	4
		M Gustafsson	4	6	6											M Gustafsson	77	6
	Q	U Riglewski	6	2	4				M Gustafsson	6	6
	Q	T Tulasne	0	4				15	G Pérez Roldán	4	3
	15	G Pérez Roldán	6	6																			M Gustafsson	5	5
	9	S Bruguera	6	65	6																	9	S Bruguera	7	7
		R Furlan	3	77	3			9	S Bruguera	6	7
		H Leconte	5	6	1				C Caratti	1	5
		C Caratti	7	2	6										9	S Bruguera	6	6
		J Arias	2	66											WC	A Mancini	1	4
	WC	A Mancini	6	78				WC	A Mancini	6	6
								7	E Sánchez	3	3

Section 2

	First round							Second round							Third round							Quarterfinals
								4	A Agassi	0	77	3
		JP Fleurian	6	4	2				H Skoff	6	63	6
		H Skoff	4	6	6											H Skoff	6	7
		P Lundgren	1	4											Q	C Pistolesi	2	5
		J Aguilera	6	6					J Aguilera	3	6	5
	Q	C Pistolesi	79	5	6			Q	C Pistolesi	6	1	7
	13	M Rosset	67	7	3																		H Skoff	6	6
	11	T Muster	79	2	1																	6	J Svensson	3	3
	Q	V Paloheimo	67	6	6			Q	V Paloheimo	7	6
		M Koevermans	6	6					M Koevermans	5	4
		L Mattar	3	2											Q	V Paloheimo	1	6	3
		F Davín	4	0r											6	J Svensson	6	4	6
	Q	D Pescariu	6	1				Q	D Pescariu	3	6	4
								6	J Svensson	6	4	6

Bottom half

Section 3

	First round							Second round							Third round							Quarterfinals
								5	G Ivanišević	77	77
		J Arrese	6	6					J Arrese	64	65
	WC	B Borg	2	3											5	G Ivanišević	6	0	2
	WC	T Champion	6	4	3										WC	C-U Steeb	2	6	6
	WC	C-U Steeb	2	6	6			WC	C-U Steeb	6	6
		O Camporese	6	3	6				O Camporese	4	3
	12	A Gómez	3	6	1																	WC	C-U Steeb	4	2
	14	K Nováček	2	4																			G Prpić	6	6
		G Prpić	6	6					G Prpić	6	6
		M Jaite	3	2					R Fromberg	1	4
		R Fromberg	6	6												G Prpić	6	6
		C Bergström	0	2											3	G Forget	2	0
		P Haarhuis	6	6					P Haarhuis	5	4
								3	G Forget	7	6

Section 4

	First round							Second round							Third round							Quarterfinals
								8	A Chesnokov	77	6
		M Wilander	6	6					M Wilander	63	2
	WC	M Woodforde	0	3											8	A Chesnokov	6	6
		N Kulti	6	63	62										10	A Cherkasov	1	0
		R Agénor	2	77	77				R Agénor	64	3
		E Jelen	0	2				10	A Cherkasov	77	6
	10	A Cherkasov	6	6																		8	A Chesnokov	1	3
	16	A Volkov	5	6	7																	2	B Becker	6	6
		H de la Peña	7	3	5			16	A Volkov	2	6	6
	Q	T Guardiola	3	1					F Santoro	6	1	4
		F Santoro	6	6											16	A Volkov	6	1	1
		M Filippini	1	1											2	B Becker	3	6	6
		J Sánchez	6	6					J Sánchez	77	3	3
								2	B Becker	63	6	6

External links

• 1991 Monte Carlo Open draw