2003 Brasil Open – Singles

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.

Seeds

 * 1) 🇩🇪 Rainer Schüttler (final)
 * 2)  Sjeng Schalken (champion)
 * 3) 🇧🇷 Gustavo Kuerten (semifinals)
 * 4)  Fernando González (first round)
 * 5) 🇺🇸 Vince Spadea (quarterfinals)
 * 6) 🇦🇷 Juan Ignacio Chela (second round)
 * 7) 🇧🇷 Flávio Saretta (second round)
 * 8)  Kenneth Carlsen (quarterfinals)