Men's singles
1998 Estoril Open
Final
Champion	Alberto Berasategui
Runner-up	Thomas Muster
Score	3–6, 6–1, 6–3
Details
Draw	32
Seeds	8
Events
Singles men women Doubles men women
← 1997 · Estoril Open · 1999 →

Àlex Corretja was the defending champion, but did not participate this year.

Alberto Berasategui won the tournament, beating Thomas Muster in the final, 3–6, 6–1, 6–3.

	Semifinals							Final
		Karim Alami	6	2	4
	6	Thomas Muster	3	6	6
								6	Thomas Muster	6	1	3
								3	Alberto Berasategui	3	6	6
	3	Alberto Berasategui	6	6
	2	Carlos Moyá	1	1

	First round							Second round							Quarterfinals							Semifinals
	1	F Mantilla	6	6
		J Sánchez	1	3				1	F Mantilla	6	1	78
		G Blanco	64	4					A Gaudenzi	1	6	66
		A Gaudenzi	77	6											1	F Mantilla	6	5	1
		T Nydahl	1	0r												K Alami	3	7	6
		S Doseděl	6	3					S Doseděl	4	6	610
		K Alami	6	6					K Alami	6	4	712
	7	F Clavet	4	3																			K Alami	6	2	4
	4	A Costa	79	6																		6	T Muster	3	6	6
		J Burillo	67	0				4	A Costa	6	6
		J Novák	4	6	77				J Novák	3	4
		H Arazi	6	0	63										4	A Costa	4	4
	WC	N Marques	3	0											6	T Muster	6	6
		F Meligeni	6	6					F Meligeni	5	3
		D Pescariu	5	1				6	T Muster	7	6
	6	T Muster	7	6

	First round							Second round							Quarterfinals							Semifinals
	5	F Santoro	2	7	0
		J Alonso	6	5	6				J Alonso	2	4
	Q	JA Marín	6	77				Q	JA Marín	6	6
	WC	B Mota	0	65											Q	JA Marín	6	4	3
		F Dewulf	77	6											3	A Berasategui	3	6	6
		R Fromberg	64	3					F Dewulf	4	7	5
	Q	J Muñoz	4	4				3	A Berasategui	6	5	7
	3	A Berasategui	6	6																		3	A Berasategui	6	6
	8	A Portas	65	3																		2	C Moyá	1	1
		JA Viloca-Puig	77	6					JA Viloca-Puig	2	6	2
		C Costa	6	6					C Costa	6	3	6
	Q	A Martín	3	3												C Costa	63	77	2
		M-K Goellner	6	7											2	C Moyá	77	65	6
	Q	J Imaz-Ruiz	4	5					M-K Goellner	3	2
		B Ulihrach	3	6	4			2	C Moyá	6	6
	2	C Moyá	6	4	6

• Main draw