Singles
1991 Grand Prix de Tennis de Lyon
Champion	Pete Sampras
Runner-up	Olivier Delaître
Score	6–1, 6–1

Marc Rosset was the defending champion, but lost in the first round this year.

Pete Sampras won the title, beating Olivier Delaître 6–1, 6–1 in the final.

Seeds

Draw

Finals

	Semifinals							Final
	WC	Olivier Delaître	6	6
	3	Sergi Bruguera	4	4
								WC	Olivier Delaître	1	1
								2	Pete Sampras	6	6
	4	Brad Gilbert	1	2
	2	Pete Sampras	6	6

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	G Forget	6	4	3
	WC	O Delaître	1	6	6			WC	O Delaître	6	66	77
		C Pioline	7	65	6				C Pioline	2	78	63
		T Carbonell	5	77	3										WC	O Delaître	6	77
		J Kriek	77	6												J Kriek	2	63
		S Pescosolido	65	3					J Kriek	6	6
		F Santoro	6	6					F Santoro	4	4
	8	M Rosset	1	3																		WC	O Delaître	6	6
	3	S Bruguera	3	6	6																	3	S Bruguera	4	4
	SE	A Boetsch	6	3	4			3	S Bruguera	710	77
		J-P Fleurian	3	2					G Raoux	68	62
		G Raoux	6	6											3	S Bruguera	6	77
	WC	F Fontang	0	64												K Curren	0	63
	SE	C van Rensburg	6	77				SE	C van Rensburg	1	2
		K Curren	65	77	77				K Curren	6	6
	5	D Rostagno	77	63	64

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	6	A Mancini	2	7	77
		C Saceanu	6	5	62			6	A Mancini	710	6
		N Kulti	6	6					N Kulti	68	4
		V Paloheimo	2	4											6	A Mancini	2	2
	Q	É Winogradsky	6	3	6										4	B Gilbert	6	6
	Q	S DeVries	1	6	3			Q	É Winogradsky	5	1
		A Mronz	3	5				4	B Gilbert	7	6
	4	B Gilbert	6	7																		4	B Gilbert	1	2
	7	J Svensson	1	6	77																	2	P Sampras	6	6
		P Kühnen	6	3	63			7	J Svensson	64	6	6
		R Agénor	69	7	7				R Agénor	77	3	1
	Q	Y Doumbia	711	5	5										7	J Svensson	2	2
		T Champion	6	6											2	P Sampras	6	6
	WC	Y Noah	4	4					T Champion	1	3
	Q	T Nijssen	3	2				2	P Sampras	6	6
	2	P Sampras	6	6

References

• Main Draw