1991 Grand Prix de Tennis de Lyon – Singles

Singles
1991 Grand Prix de Tennis de Lyon
Champion	Pete Sampras
Runner-up	Olivier Delaître
Score	6–1, 6–1
Draw	32
Seeds	8

The 1991 Grand Prix de Tennis de Lyon – Singles was an event of the 1991 Grand Prix de Tennis de Lyon men's tennis tournament that was played at the Palais des Sports de Gerland in Lyon, France from 14 October until 21 October 1991. The draw comprised 32 players and eight were seeded. Eighth-seeded Marc Rosset was the defending champion, but lost in the first round to Fabrice Santoro. Second-seeded Pete Sampras won the singles title, defeating unseeded Olivier Delaître, in the final, 6–1, 6–1.^[1]

	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

	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

	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

• ATP main draw