Doubles
1998 Great American Insurance ATP Championships
Final
Champions	Mark Knowles Daniel Nestor[1]
Runners-up	Olivier Delaître Fabrice Santoro
Score	6–1, 2–1, retired
Events
Singles Doubles
← 1997 · Cincinnati Masters · 1999 →

Todd Woodbridge and Mark Woodforde were the defending champions, but lost in the quarterfinals to Olivier Delaître and Fabrice Santoro.

Mark Knowles and Daniel Nestor won the title, by defeating Delaitre and Santoro, 6–1, 2–1 (ret) in the finals.

Champion seeds are indicated in bold text while text in italics indicates the round in which those seeds were eliminated.

	Semifinals							Final[1]
		Olivier Delaître Fabrice Santoro	6	6
	5	Yevgeny Kafelnikov Daniel Vacek	2	2
									Olivier Delaître Fabrice Santoro	1	1r
									Mark Knowles Daniel Nestor	6	2
		David Roditi Michael Tebbutt	3	5
		Mark Knowles Daniel Nestor	6	7

	First round							Second round							Quarterfinals							Semifinals
								1	T Woodbridge M Woodforde	7	7
		S Stolle C Suk	4	7	6				S Stolle C Suk	6	5
		J Eagle A Florent	6	5	3										1	T Woodbridge M Woodforde	7	1	5
		O Delaître F Santoro	3	6	6											O Delaître F Santoro	6	6	7
		A Kitinov A Kratzmann	6	3	4				O Delaître F Santoro	7	6
		M Damm J Grabb	6	6					M Damm J Grabb	6	1
		B Ellwood M Ondruska	2	3																			O Delaître F Santoro	6	6
																						5	Y Kafelnikov D Vacek	2	2
								4	Ellis Ferreira Rick Leach	2	6
		J Gimelstob T Martin	6	7					J Gimelstob T Martin	6	7
		À Corretja J Siemerink	4	6												J Gimelstob T Martin	4	1
		P Korda M Ríos	1	6	6										5	Y Kafelnikov D Vacek	6	6
		D Adams F Wibier	6	3	2				P Korda M Ríos
	5	Y Kafelnikov D Vacek	6	6				5	Y Kafelnikov D Vacek	w/o
		L Jensen M Jensen	4	4

	First round							Second round							Quarterfinals							Semifinals
		D Roditi M Tebbutt	7	6
	6	P Galbraith D Macpherson	6	4					D Roditi M Tebbutt	7	6
		J-L de Jager R Koenig	6	6	6				J-L de Jager R Koenig	5	4
		B Black A O'Brien	7	3	4											D Roditi M Tebbutt	6	6	6
		W Black S Lareau	6	4	6											W Black S Lareau	7	4	4
		J Tarango K Ullyett	3	6	1				W Black S Lareau	6	6
								3	J Björkman P Rafter	4	4
																							D Roditi M Tebbutt	3	5
	7	D Johnson F Montana	6	6																			M Knowles D Nestor	6	7
		J Thomas D Wheaton	4	4				7	D Johnson F Montana	5	6	6
		M Knowles D Nestor	6	6					M Knowles D Nestor	7	4	7
		B Coupe D Randall	4	4												M Knowles D Nestor	6	7
		P Albano N Lapentti	6	6												P Albano N Lapentti	3	6
		N Broad P Norval	4	4					P Albano N Lapentti	7	7
								2	M Bhupathi P Haarhuis	5	6