Singles
1990 Volvo U.S. National Indoor
Final
Champion	Michael Stich
Runner-up	Wally Masur
Score	6–7(5–7), 6–4, 7–6(7–1)
Details
Draw	48
Seeds	16
Events
Singles Doubles
← 1989 · Volvo U.S. National Indoor · 1991 →

Brad Gilbert was the defending champion, but did not take part in the U.S. National Indoor tennis tournament that year.
Michael Stich clinched his first career singles title in the final, defeating Wally Masur 6–7^(5–7), 6–4, 7–6^(7–1).^[1]

All seeds receive a bye into the second round.

	Quarterfinals							Semifinals							Final
		Gary Muller	7	7
	Q	Danie Visser	5	5
									Gary Muller	5	64
									Michael Stich	7	77
		Michael Stich	6	77
	Q	MaliVai Washington	4	65
																Michael Stich	65	6	77
															6	Wally Masur	77	4	61
	6	Wally Masur	6	7
	13	Petr Korda	4	5
								6	Wally Masur	6	6
									Glenn Layendecker	3	2
		Veli Paloheimo	7	63	4
		Glenn Layendecker	5	77	6

	First round							Second round							Third round							Quarterfinals
								1	S Edberg	1	5
		P Aldrich	65	3					G Muller	6	7
		G Muller	77	6												G Muller	4	7	6
		R Krishnan	6	6											15	J Arias	6	5	3
		C Motta	2	1					R Krishnan	5	77	3
								15	J Arias	7	65	6
																							G Muller	7	7
																						Q	D Visser	5	5
								9	P Annacone	5	79	4
	Q	D Visser	6	6				Q	D Visser	7	67	6
		M Kratzmann	4	3											Q	D Visser	3	77	6
	WC	V Amritraj	4r												7	M Filippini	6	61	4
	Q	B Page	1						B Page	3	63
								7	M Filippini	6	77

	First round							Second round							Third round							Quarterfinals
								3	A Chesnokov	6	6
	Q	C Garner	2	2				Q	R Smith	4	4
	Q	R Smith	6	6											3	A Chesnokov	3	1
		G Connell	6	64	4											M Stich	6	6
		M Stich	4	77	6				M Stich	6	6
								14	K Evernden	1	2
																							M Stich	6	77
																						Q	M Washington	4	65
								12	R Reneberg	6	6
	WC	K Flach	6	4	77			WC	K Flach	3	2
		H de la Peña	4	6	65										12	R Reneberg	6	64	3
	Q	M Washington	3	6	6										Q	M Washington	4	77	6
		P Kühnen	6	2	4			Q	M Washington	6	6
								5	C van Rensburg	4	4

	First round							Second round							Third round							Quarterfinals
								6	W Masur	6	6
		D Pérez	7	77					D Pérez	2	3
	Q	B Shelton	5	64											6	W Masur	64	6	78
		U Riglewski	3	6	1										11	J-P Fleurian	77	1	66
		N Kroon	6	4	6				N Kroon	3	6	3
								11	J-P Fleurian	6	4	6
																						6	W Masur	6	7
																						13	P Korda	4	5
								13	P Korda	6	6
		G Bloom	7	6					G Bloom	1	4
		M Laurendeau	5	1											13	P Korda	78	6
	WC	K Evans	4	2											4/WC	K Curren	66	4
		L Duncan	6	6					L Duncan	4	2
								4/WC	K Curren	6	6

	First round							Second round							Third round							Quarterfinals
								8	M Pernfors	65	3
		V Paloheimo	77	78					V Paloheimo	77	6
		D Rostagno	63	66												V Paloheimo	7	6
		K Jones	64	3											10/WC	P Chamberlin	5	1
		B Orešar	77	6					B Orešar	5	4
								10/WC	P Chamberlin	7	6
																							V Paloheimo	7	63	4
																							G Layendecker	5	77	6
								16	D Cahill	66	77	7
		T Wilkison	7	6					T Wilkison	78	60	5
		L Shiras	5	3											16	D Cahill	4	4
		J Brown	2	67												G Layendecker	6	6
		G Layendecker	6	79					G Layendecker	6	6
								2	M Chang	4	4

• Main draw