Singles
1998 Great American Insurance ATP Championships
Final
Champion	Patrick Rafter[1]
Runner-up	Pete Sampras
Score	1–6, 7–6(7–2), 6–4
Details
Draw	56
Seeds	16
Events
Singles Doubles
← 1997 · Great American Insurance ATP Championships · 1999 →

Patrick Rafter defeated the defending champion Pete Sampras in the final, 1–6, 7–6^(7–2), 6–4 to win the singles tennis title at the 1998 Cincinnati Masters.

The top eight seeds received a bye to the second round.

	Semifinals							Final[1]
	1	Pete Sampras	7	2	6
		Magnus Larsson	5	6	1
								1	Pete Sampras	6	62	4
								5	Patrick Rafter	1	77	6
	5	Patrick Rafter	7	6
	7	Yevgeny Kafelnikov	5	0

	First round							Second round							Third round							Quarterfinals
								1	P Sampras	6	6
		M Damm	6	3	6				M Damm	4	2
		M Woodforde	4	6	2										1	P Sampras	77	6
		J-M Gambill	6	6												J-M Gambill	63	3
	Q	O Delaître	1	3					J-M Gambill	65	77	6
		R Delgado	64	3				16	C Pioline	77	65	4
	16	C Pioline	77	6																		1	P Sampras	6	6
	10	A Agassi	4	77	6																		V Spadea	3	2
		N Kiefer	6	63	2			10	A Agassi	2	6	62
		J Gimelstob	6	68	2				V Spadea	6	0	77
		V Spadea	3	710	6											V Spadea	6	6
	Q	A Clément	4	3											8	R Krajicek	2	3
	Q	A Medvedev	6	6				Q	A Medvedev	3	77	3
								8	R Krajicek	6	65	6

	First round							Second round							Third round							Quarterfinals
								4	C Moyà	4	2
		N Escudé	2	77	3			Q	J Golmard	6	6
	Q	J Golmard	6	62	6										Q	J Golmard	65	62
		T Johansson	77	7												T Johansson	77	77
		W Black	63	5					T Johansson	5	6	77
		J Tarango	7	6					J Tarango	7	2	64
	13	A Berasategui	5	2																			T Johansson	4	62
	12	Á Costa	1	6	6																		M Larsson	6	77
	Q	S Grosjean	6	4	1			12	Á Costa	1	3
		T Haas	77	77					T Haas	6	6
		J Courier	63	65												T Haas	4	4
		G Pozzi	4	5												M Larsson	6	6
		M Larsson	6	7					M Larsson	65	6	6
								6	J Björkman	77	2	3

	First round							Second round							Third round							Quarterfinals
								5	P Rafter	6	6
	Q	W Schranz	65	7	4				G Raoux	1	3
		G Raoux	77	5	6										5	P Rafter	3	6	6
		T Martin	6	6												T Martin	6	3	2
		F Santoro	1	4					T Martin	6	6
		T Muster	6	7					T Muster	3	4
	11	T Henman	4	5																		5	P Rafter	6	710
	14	G Ivanišević	6	0	6																	3	P Korda	4	68
		A Ilie	4	6	4			14	G Ivanišević	6	6
		B Black	2	3					M Philippoussis	3	2
		M Philippoussis	6	6											14	G Ivanišević	7	4	5
	WC	S Campbell	7	2	3										3	P Korda	5	6	7
	Q	M Ondruska	5	6	6			Q	M Ondruska	2	3
								3	P Korda	6	6

	First round							Second round							Third round							Quarterfinals
								7	Y Kafelnikov	6	4	6
		T Woodbridge	1	6	2				M Chang	3	6	4
		M Chang	6	3	6										7	Y Kafelnikov	6	6
		S Draper	6	4	7											S Draper	3	3
		N Lapentti	4	6	5				S Draper	6	65	77
	WC	A O'Brien	3	77	67			9	Á Corretja	3	77	65
	9	Á Corretja	6	63	79																	7	Y Kafelnikov	6	6
	15	F Mantilla	65	5																			D Vacek	4	4
		W Ferreira	77	7					W Ferreira	65	4
		J Siemerink	1	6	77				J Siemerink	77	6
		S Schalken	6	1	62											J Siemerink	1	4
		D Vacek	6	3	710											D Vacek	6	6
		J Stoltenberg	2	6	68				D Vacek	6	6
								2	M Ríos	3	2