Men's singles
1991 OTB International Open
Final
Champion	Michael Stich
Runner-up	Emilio Sánchez
Score	6–2, 6–4
Details
Draw	32 (1WC/4Q/2LL)
Seeds	8
Events
Singles men women Doubles men women
← 1990 · OTB Open · 1992 →

Ramesh Krishnan was the defending champion, but lost in the first round this year.

Michael Stich won the tournament, beating Emilio Sánchez in the final, 6–2, 6–4.^[1]

Seeds

Draw

Key

Finals

	Semifinals							Final
	1	Michael Stich	7	6
	6	Horst Skoff	5	1
								1	Michael Stich	6	6
								3	Emilio Sánchez	2	4
	3	Emilio Sánchez	7	6
	8	Francisco Clavet	5	1

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	M Stich	78	6
		M Woodforde	66	3				1	M Stich	6	6
		T Carbonell	4	6	7				T Carbonell	1	2
		P Kühnen	6	3	5										1	M Stich	6	6
	WC	A Gómez	6	6											7	T Woodbridge	4	2
		J Eltingh	4	0				WC	A Gómez	77	4	5
		C Bergström	1	2				7	T Woodbridge	64	6	7
	7	T Woodbridge	6	6																		1	M Stich	7	6
	4	A Cherkasov	6	6																		6	H Skoff	5	1
		J Tarango	2	3				4	A Cherkasov	6	7
		R Fromberg	6	6					R Fromberg	2	5
		J Arias	4	3											4	A Cherkasov	710	3	62
		R Krishnan	3	4											6	H Skoff	68	6	77
	Q	C Adams	6	6				Q	C Adams	7	2	63
		W Ferreira	3	77	2			6	H Skoff	5	6	77
	6	H Skoff	6	64	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	5	A Volkov	6	6
		D Poliakov	2	1				5	A Volkov	0	79	7
		C Pioline	2	4					J Sánchez	6	67	5
		J Sánchez	6	6											5	A Volkov	1	5
		G Raoux	3	1d											3	E Sánchez	6	7
		B Wuyts	6	2					B Wuyts	65	2
	LL	D Adams	4	4				3	E Sánchez	77	6
	3	E Sánchez	6	6																		3	E Sánchez	7	6
	8	F Clavet	7	77																		8	F Clavet	5	1
	Q	S Simian	5	64				8	F Clavet	6	6
	Q	M Knowles	6	77				Q	M Knowles	3	0
	Q	N Pereira	4	65											8	F Clavet	6	6
	LL	Jason Netter	3	2											2	S Bruguera	1	4
		P Haarhuis	6	6					P Haarhuis	4	6	5
		J Stoltenberg	6	2	3			2	S Bruguera	6	3	7
	2	S Bruguera	4	6	6