Singles
2004 Brasil Open
Champion	Gustavo Kuerten
Runner-up	Agustín Calleri
Score	3–6, 6–2, 6–3

Sjeng Schalken was the defending champion but did not compete that year.

Gustavo Kuerten won in the final 3–6, 6–2, 6–3 against Agustín Calleri.

Seeds

Draw

Finals

	Semifinals							Final
		José Acasuso	4	3
	3	Gustavo Kuerten	6	6
								3	Gustavo Kuerten	3	6	6
								4	Agustín Calleri	6	2	3
	4	Agustín Calleri	6	5	6
		Luis Horna	4	7	1

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	C Moyá	3	3
		T Behrend	6	6					T Behrend	6	6
		H Levy	4	63					R Ramírez Hidalgo	2	2
		R Ramírez Hidalgo	6	77												T Behrend	6	2	4
		C Rochus	3	4												J Acasuso	0	6	6
		J Acasuso	6	6					J Acasuso	77	6
		F Volandri	6	6					F Volandri	64	2
	6	F Mantilla	2	2																			J Acasuso	4	3
	3	G Kuerten	3	6	6																	3	G Kuerten	6	6
		Ó Hernández	6	2	3			3	G Kuerten	77	6
		R Gasquet	6	77					R Gasquet	63	3
	WC	F Ferreiro	0	65											3	G Kuerten	3	7	7
	Q	F Squillari	6	7											Q	F Squillari	6	5	5
	Q	J-R Lisnard	2	5				Q	F Squillari	77	6
	WC	R Mello	2	4				7	G Gaudio	63	3
	7	G Gaudio	6	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	8	J I Chela	6	6
		F Saretta	2	2				8	J I Chela	6	6
		D Ferrer	6	5					D Ferrer	2	4
		N Lapentti	4	2r											8	J I Chela	3	6	3
		G Cañas	1	0r											4	A Calleri	6	3	6
	Q	F Verdasco	6	1				Q	F Verdasco	4	4
		A Portas	1	3				4	A Calleri	6	6
	4	A Calleri	6	6																		4	A Calleri	6	5	6
	5	M Zabaleta	4	1																			L Horna	4	7	1
		A Montañés	6	6					A Montañés	2	64
		D Sánchez	2	64					G Blanco	6	77
		G Blanco	6	77												G Blanco	1	65
	WC	P Braga	3	2												L Horna	6	77
		L Horna	6	6					L Horna	6	6
	Q	J Mónaco	6	6				Q	J Mónaco	4	1
	2	N Massú	4	2

References

• 2004 Brasil Open Draw
• 2004 Brasil Open Qualifying Draw