Singles
1998 Sybase Open
Final
Champion	Andre Agassi
Runner-up	Pete Sampras
Score	6–2, 6–4
Details
Draw	32 (4Q / 3WC)
Seeds	8
Events
Singles Doubles
← 1997 · Pacific Coast Championships · 1999 →

Pete Sampras was the two-time defending champion,^[1] but lost in the final to Andre Agassi, 2–6, 4–6.^[2]

	Semifinals							Final
	1	Pete Sampras	6	2	6
	Q	John van Lottum	3	6	2
								1	Pete Sampras	2	4
								WC	Andre Agassi	6	6
	WC	Andre Agassi	6	77
	2	Michael Chang	4	64

	First round							Second round							Quarterfinals							Semifinals
	1	P Sampras	6	6
		J Stark	3	4				1	P Sampras	6	77
		A Gaudenzi	3	1					J Burillo	3	62
		J Burillo	6	6											1	P Sampras	6	6
	WC	M Washington	7	6											8	M Woodforde	0	2
		R Delgado	5	2				WC	M Washington	5	5
		W Black	78	2	4			8	M Woodforde	7	7
	8	M Woodforde	66	6	6																	1	P Sampras	6	2	6
	4/WC	M Philippoussis	4	3																		Q	J van Lottum	3	6	2
		V Spadea	6	6					V Spadea	5	77	2
	Q	J van Lottum	6	4	6			Q	J van Lottum	7	62	6
		A O'Brien	3	6	2										Q	J van Lottum	2	6	710
		E Benfele Álvarez	61	5												T Martin	6	4	68
	Q	J Oncins	77	7				Q	J Oncins	3	63
		T Martin	6	7					T Martin	6	77
	5	T Woodbridge	4	5

	First round							Second round							Quarterfinals							Semifinals
	6	R Fromberg	77	2	4
		T Nydahl	65	6	6				T Nydahl	4	61
		S Sargsian	3	6	4			Q	J-M Gambill	6	77
	Q	J-M Gambill	6	1	6										Q	J-M Gambill	5	67
	WC	A Agassi	6	6											WC	A Agassi	7	79
		A Martín	2	2				WC	A Agassi	6	6
		J Gimelstob	65	6	1			3	G Kuerten	3	1
	3	G Kuerten	77	4	6																	WC	A Agassi	6	77
	7	T Haas	6	6																		2	M Chang	4	64
		JA Viloca-Puig	1	4				7	T Haas	6	6
		R Reneberg	4	2					G Stafford	2	3
		G Stafford	6	6											7	T Haas	3	77	4
	Q	G Bastl	6	2	6										2	M Chang	6	63	6
		F Meligeni	1	6	3			Q	G Bastl	5	3
		M Craca	2	4				2	M Chang	7	6
	2	M Chang	6	6

• Main draw
• Qualifying draw