Singles
1990 Athens Open
Final
Champion	Mark Koevermans
Runner-up	Franco Davín
Score	5–7, 6–4, 6–1
Details
Draw	32
Seeds	8
Events
Singles Doubles
← 1989 · ATP Athens Open · 1991 →

Ronald Agénor was the defending champion, but did not participate this year.

Mark Koevermans won the tournament, beating Franco Davín in the final, 5–7, 6–4, 6–1.^[1]

	Semifinals							Final
		Marián Vajda	61	6	3
	5	Franco Davín	77	2	6
								5	Franco Davín	7	4	1
								7	Mark Koevermans	5	6	6
	4	Jordi Arrese	2	64
	7	Mark Koevermans	6	77

	First round							Second round							Quarterfinals							Semifinals
	1	T Muster	7	6
		M Wostenholme	6	3				1	T Muster	6	6	3
		J Wöhrmann	2	6					M Vajda	3	7	6
		M Vajda	6	7												M Vajda	6	6
		T Carbonell	7	6												T Carbonell	3	3
	Q	MA Gorriz	6	3					T Carbonell	6	6
		D Pérez	4	4				8	H de la Peña	1	4
	8	H de la Peña	6	6																			M Vajda	61	6	3
	3	G Pérez Roldán	7	6	6																	5	F Davín	77	2	6
		C Costa	6	7	1			3	G Pérez Roldán	6	6
		J Tarango	6	4	6				J Tarango	2	3
	WC	S Casal	3	6	4										3	G Pérez Roldán	2	1
		F Luna	6	6											5	F Davín	6	6
		M Střelba	2	2					F Luna	5	3
		R Furlan	3	1				5	F Davín	7	6
	5	F Davín	6	6

	First round							Second round							Quarterfinals							Semifinals
	6	J Sánchez	6	6	6
	Q	S Doseděl	7	2	3			6	J Sánchez	6	6
		JF Altur	3	6					L Duncan	4	0
		L Duncan	6	7											6	J Sánchez	2	3
	WC	G Kalovelonis	2	2											4	J Arrese	6	6
		J Brown	6	6					J Brown	3	6
	Q	G López	2	1				4	J Arrese	6	7
	4	J Arrese	6	6																		4	J Arrese	2	64
	7	M Koevermans	6	6																		7	M Koevermans	6	77
		J Cunha-Silva	4	2				7	M Koevermans	6	4	6
		R Azar	4	6	2			WC	A Bavelas	3	6	2
	WC	A Bavelas	6	3	6										7	M Koevermans	3	6	6
		F Clavet	2	6	6											F Roig	6	1	2
	LL	T Nydahl	6	3	2				F Clavet	2	7	4
		F Roig	6	7					F Roig	6	6	6
	2	E Sánchez	2	6

• Main draw