| Main Name: | Portugal OpenEstoril Open |
| Score: | 6–1, 2–6, 6–1 |
| Before Name: | Estoril Open – Doubles |
| After Name: | Estoril Open |
See main article: 1998 Estoril Open.
Gustavo Kuerten and Fernando Meligeni were the defending champions. Kuerten did not participate this year. Meligeni partnered Filippo Messori, losing in the quarterfinals.
Donald Johnson and Francisco Montana won in the final 6–1, 2–6, 6–1, against David Roditi and Fernon Wibier.
Donald Johnson / Francisco Montana (champions)
Luis Lobo / 
Javier Sánchez (first round)
Neil Broad / Piet Norval (first round) Daniel Orsanic (first round)