Singles
1991 Donnay Indoor Championships
Champion	Guy Forget
Runner-up	Andrei Cherkasov
Score	6–3, 7–5, 3–6, 7–6

Boris Becker was the defending champion, but retired from his semifinals match this year.

Guy Forget won the title, defeating Andrei Cherkasov 6–3, 7–5, 3–6, 7–6 in the final.

Seeds

Draw

Finals

	Semifinals							Final
	1	Boris Becker	6	3	2r
	WC	Andrei Cherkasov	2	6	2
								WC	Andrei Cherkasov	3	5	6	6
								4	Guy Forget	6	7	3	7
	4	Guy Forget	3	6	6
	2	Stefan Edberg	6	0	3

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	B Becker	6	3	6
		A Volkov	4	6	3			1	B Becker	7	7
	Q	E Jelen	7	6				Q	E Jelen	6	6
	Q	S Doseděl	6	3											1	B Becker	7	6
	Q	A Boetsch	6	2	6										7	M Chang	5	1
		H Skoff	4	6	4			Q	A Boetsch	3	2
		T Woodbridge	4	3				7	M Chang	6	6
	7	M Chang	6	6																		1	B Becker	6	3	2r
	3	A Agassi	3	6																		WC	A Cherkasov	2	6	2
	Q	C Saceanu	6	7				Q	C Saceanu	4	2
	WC	A Cherkasov	6	6				WC	A Cherkasov	6	6
		J Aguilera	2	2											WC	A Cherkasov	7	6
		H Leconte	7	4	2										6	A Chesnokov	5	1
		G Prpić	6	6	6				G Prpić	4	6
	LL	C Bergström	6	4	4			6	A Chesnokov	6	7
	6	A Chesnokov	3	6	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	5	J Svensson	0	4
		M Rosset	6	6					M Rosset	6	6
		C-U Steeb	2	5					R Agénor	4	3
		R Agénor	6	7												M Rosset	2	5
	WC	E Masso	6	6	6										4	G Forget	6	7
		R Fromberg	3	7	3			WC	E Masso	1	2
		A Mansdorf	6	3	3			4	G Forget	6	6
	4	G Forget	4	6	6																	4	G Forget	3	6	6
	8	J Hlasek	6	6																		2	S Edberg	6	0	3
		M Larsson	3	2				8	J Hlasek	6	7
		M Wilander	6	7					M Wilander	1	5
		O Camporese	4	6											8	J Hlasek	1	2
		K Nováček	6	6	3										2	S Edberg	6	6
	WC	P Cash	2	7	6			WC	P Cash	6	1	4
		M Gustafsson	0	4				2	S Edberg	3	6	6
	2	S Edberg	6	6

References

• Main Draw