# 1998 Estoril Open – Men's singles

Àlex Corretja was the defending champion, but did not participate this year.
Alberto Berasategui won the tournament, beating Thomas Muster in the final, 3–6, 6–1, 6–3.

## Seeds

* Félix Mantilla (quarterfinals)
* Carlos Moyá (semifinals)
* Alberto Berasategui (champion)
* Albert Costa (quarterfinals)
* Fabrice Santoro (first round)
* Thomas Muster (final)
* Francisco Clavet (first round)
* Albert Portas (first round)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final |
| | Karim Alami | 6 | 2 | 4 | | | | | |
| 6 | Thomas Muster | 3 | 6 | 6 | | | | | |
| 6 | Thomas Muster | 3 | 6 | 6 | 6 | Thomas Muster | 6 | 1 | 3 |
| | | | | | 3 | Alberto Berasategui | 3 | 6 | 6 |
| 3 | Alberto Berasategui | 6 | 6 | | 3 | Alberto Berasategui | 3 | 6 | 6 |
| 2 | Carlos Moyá | 1 | 1 | | | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | F Mantilla | 6 | 6 | | | | | | | | | | | | | | | | |
| | J Sánchez | 1 | 3 | | 1 | F Mantilla | 6 | 1 | 7$^8$ | | | | | | | | | | |
| | G Blanco | 6$^4$ | 4 | | | A Gaudenzi | 1 | 6 | 6$^6$ | | | | | | | | | | |
| | A Gaudenzi | 7$^7$ | 6 | | | | | | | 1 | F Mantilla | 6 | 5 | 1 | | | | | |
| | T Nydahl | 1 | 0$^r$ | | | | | | | | K Alami | 3 | 7 | 6 | | | | | |
| | S Doseděl | 6 | 3 | | | S Doseděl | 4 | 6 | 6$^{10}$ | | | | | | | | | | |
| | K Alami | 6 | 6 | | | K Alami | 6 | 4 | 7$^{12}$ | | | | | | | | | | |
| 7 | F Clavet | 4 | 3 | | | | | | | | | | | | | K Alami | 6 | 2 | 4 |
| 4 | A Costa | 7$^9$ | 6 | | | | | | | | | | | | 6 | T Muster | 3 | 6 | 6 |
| | J Burillo | 6$^7$ | 0 | | 4 | A Costa | 6 | 6 | | | | | | | | | | | |
| | J Novák | 4 | 6 | 7$^7$ | | J Novák | 3 | 4 | | | | | | | | | | | |
| | H Arazi | 6 | 0 | 6$^3$ | | | | | | 4 | A Costa | 4 | 4 | | | | | | |
| WC | N Marques | 3 | 0 | | | | | | | 6 | T Muster | 6 | 6 | | | | | | |
| | F Meligeni | 6 | 6 | | | F Meligeni | 5 | 3 | | | | | | | | | | | |
| | D Pescariu | 5 | 1 | | 6 | T Muster | 7 | 6 | | | | | | | | | | | |
| 6 | T Muster | 7 | 6 | | | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 5 | F Santoro | 2 | 7 | 0 | | | | | | | | | | | | | | |
| | J Alonso | 6 | 5 | 6 | | J Alonso | 2 | 4 | | | | | | | | | | |
| Q | JA Marín | 6 | 7$^7$ | | Q | JA Marín | 6 | 6 | | | | | | | | | | |
| WC | B Mota | 0 | 6$^5$ | | | | | | | Q | JA Marín | 6 | 4 | 3 | | | | |
| | F Dewulf | 7$^7$ | 6 | | | | | | | 3 | A Berasategui | 3 | 6 | 6 | | | | |
| | R Fromberg | 6$^4$ | 3 | | | F Dewulf | 4 | 7 | 5 | | | | | | | | | |
| Q | J Muñoz | 4 | 4 | | 3 | A Berasategui | 6 | 5 | 7 | | | | | | | | | |
| 3 | A Berasategui | 6 | 6 | | | | | | | | | | | | 3 | A Berasategui | 6 | 6 |
| 8 | A Portas | 6$^5$ | 3 | | | | | | | | | | | | 2 | C Moyá | 1 | 1 |
| | JA Viloca-Puig | 7$^7$ | 6 | | | JA Viloca-Puig | 2 | 6 | 2 | | | | | | | | | |
| | C Costa | 6 | 6 | | | C Costa | 6 | 3 | 6 | | | | | | | | | |
| Q | A Martín | 3 | 3 | | | | | | | | C Costa | 6$^3$ | 7$^7$ | 2 | | | | |
| | M-K Goellner | 6 | 7 | | | | | | | 2 | C Moyá | 7$^7$ | 6$^5$ | 6 | | | | |
| Q | J Imaz-Ruiz | 4 | 5 | | | M-K Goellner | 3 | 2 | | | | | | | | | | |
| | B Ulihrach | 3 | 6 | 4 | 2 | C Moyá | 6 | 6 | | | | | | | | | | |
| 2 | C Moyá | 6 | 4 | 6 | | | | | | | | | | | | | | |