Gustavo Kuerten was the defending champion but lost in the semifinals to Rainer Schüttler.

Sjeng Schalken won in the final 6–2, 6–4 against Rainer Schüttler.

	Semifinals							Final
	1	Rainer Schüttler	6	2	7
	3	Gustavo Kuerten	4	6	5
								1	Rainer Schüttler	2	4
								2	Sjeng Schalken	6	6
	Q	Gastón Etlis	1	0r
	2	Sjeng Schalken	6	2

	First round							Second round							Quarterfinals							Semifinals
	1	R Schüttler	6	6
	WC	A Sá	2	0				1	R Schüttler	6	6
		P Goldstein	6	6					P Goldstein	0	1
		F Browne	2	0											1	R Schüttler	6	6
		R Delgado	6	5												R Delgado	1	3
		M Puerta	3	1r					R Delgado	2	6	6
	WC	M Daniel	4	3				7	F Saretta	6	3	4
	7	F Saretta	6	6																		1	R Schüttler	6	2	7
	3	G Kuerten	6	6																		3	G Kuerten	4	6	5
		M Norman	3	2				3	G Kuerten	6	6
		W Eschauer	5	77	77				W Eschauer	2	1
	Q	J Silva	7	62	61										3	G Kuerten	6	6
	Q	P Capdeville	77	0	1											R Mello	2	2
		R Mello	64	6	6				R Mello	2	6	6
		T Larkham	4	6	1			6	J I Chela	6	2	4
	6	J I Chela	6	2	6

	First round							Second round							Quarterfinals							Semifinals
	8	K Carlsen	4	6	713
	WC	F Ferreiro	6	4	611			8	K Carlsen	7	65	6
		I Miranda	4	4					W Moodie	5	77	3
		W Moodie	6	6											8	K Carlsen	4	77	3
	Q	G Etlis	1	6	6										Q	G Etlis	6	62	6
		B Vahaly	6	2	3			Q	G Etlis	7	4	77
		E Taino	77	7					E Taino	5	6	65
	4	F González	65	5																		Q	G Etlis	1	0r
	5	V Spadea	6	7																		2	S Schalken	6	2
		G Cañas	4	5				5	V Spadea	6	2	3
		H Gamonal	77	6					H Gamonal	1	6	1r
	Q	M Quintero	60	2											5	V Spadea	60	2
		A Popp	1	6	1										2	S Schalken	77	6
		G Carraz	6	4	6				G Carraz	5	4
		C Saulnier	64	6	3			2	S Schalken	7	6
	2	S Schalken	77	2	6

• 2003 Brasil Open Draw
• 2003 Brasil Open Qualifying Draw