2003 Estoril Open – Men's singles
| Men's singles | |
|---|---|
| 2003 Estoril Open | |
| Champion | Nikolay Davydenko |
| Runner-up | Agustín Calleri |
| Score | 6–4, 6–3 |
| Draw | 32 (3WC/4Q/2LL) |
| Seeds | 8 |
David Nalbandian was the defending champion but did not compete that year.
Nikolay Davydenko won in the final 6–4, 6–3 against Agustín Calleri.