Singles
1991 Australian Men's Hardcourt Championships
Final
Champion	Nicklas Kulti
Runner-up	Michael Stich
Score	6–3, 1–6, 6–2
Details
Draw	32
Seeds	8
Events
Singles Doubles
← 1990 · Australian Men's Hardcourt Championships · 1992 →

Thomas Muster was the defending champion of the singles event at the Australian Men's Hardcourt Championships tennis tournament, but did not participate this year.

Nicklas Kulti defeated Michael Stich 6–3, 1–6, 6–2 to secure the title.^[1]

	Semifinals							Final
		Magnus Larsson	5	4
		Nicklas Kulti	7	6
									Nicklas Kulti	6	1	6
								6	Michael Stich	3	6	2
	6	Michael Stich	6	78
	2	Jim Courier	4	66

	First round							Second round							Quarterfinals							Semifinals
	1	B Becker	4	6	62
		M Larsson	6	3	77				M Larsson	77	710
		M Kratzmann	3	6	66			Q	S Živojinović	65	68
	Q	S Živojinović	6	3	78											M Larsson	78	3	6
		V Paloheimo	0	4												P Kühnen	66	6	3
		P Kühnen	6	6					P Kühnen	7	6
		G Raoux	62	1				8	T Woodbridge	5	2
	8	T Woodbridge	77	6																			M Larsson	5	4
	4	S Bruguera	5	3																			N Kulti	7	6
		U Riglewski	7	6					U Riglewski	64	5
		T Champion	2	3					F Santoro	77	7
		F Santoro	6	6												F Santoro	3	0
		N Kulti	6	6												N Kulti	6	6
		A Rahunen	4	0					N Kulti	4	6	6
	WC	J Fitzgerald	2	3				5	M Gustafsson	6	1	1
	5	M Gustafsson	6	6

	First round							Second round							Quarterfinals							Semifinals
	6	M Stich	6	6
		J-P Fleurian	4	4				6	M Stich	7	6
	Q	S Stolle	77	65	4				G Bloom	5	1
		G Bloom	64	77	6										6	M Stich	3	6	6
	Q	J Eltingh	3	4												J Arias	6	3	3
	WC	J Stoltenberg	6	6				WC	J Stoltenberg	2	4
		J Arias	77	3					J Arias	6	6
	3	H Skoff	64	0r																		6	M Stich	6	78
	7	M Koevermans	2	62																		2	J Courier	4	66
	WC	M Woodforde	6	77				WC	M Woodforde	6	3	4
		E Jelen	3	61				Q	M Sinner	4	6	6
	Q	M Sinner	6	77											Q	M Sinner	63	3
		P Haarhuis	6	3	6										2	J Courier	77	6
		B Pearce	1	6	2				P Haarhuis	4	4
		A Mronz	6	2	1			2	J Courier	6	6
	2	J Courier	3	6	6

• 1991 Australian Men's Hardcourt Championships draw