# 2003 Estoril Open – Men's singles

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.

## Seeds

* Jiří Novák (first round)
* Rainer Schüttler (first round)
* Sjeng Schalken (first round)
* Fernando González (quarterfinals)
* Tommy Robredo (semifinals)
* Yevgeny Kafelnikov (quarterfinals)
* Max Mirnyi (semifinals)
* Jarkko Nieminen (second 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 |
| 5 | Tommy Robredo | 4 | 2 | | | | |
| | Agustín Calleri | 6 | 6 | | | | |
| | Agustín Calleri | 6 | 6 | | Agustín Calleri | 4 | 3 |
| | | | | | Nikolay Davydenko | 6 | 6 |
| | Nikolay Davydenko | 6 | 3 | 6 | Nikolay Davydenko | 6 | 6 |
| 7 | Max Mirnyi | 4 | 6 | 3 | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | J Novák | 7$^7$ | 4 | 5 | | | | | | | | | | | | |
| | J van Lottum | 6$^5$ | 6 | 7 | | J van Lottum | 1 | 3 | | | | | | | | |
| Q | F Verdasco | 6$^3$ | 6 | 4 | LL | G Blanco | 6 | 6 | | | | | | | | |
| LL | G Blanco | 7$^7$ | 1 | 6 | | | | | LL | G Blanco | 2 | 3 | | | | |
| Q | H Levy | 6 | 7$^7$ | | | | | | 5 | T Robredo | 6 | 6 | | | | |
| | M Verkerk | 3 | 6$^4$ | | Q | H Levy | 3 | 1 | | | | | | | | |
| | A Gaudenzi | 3 | 1 | | 5 | T Robredo | 6 | 6 | | | | | | | | |
| 5 | T Robredo | 6 | 6 | | | | | | | | | | 5 | T Robredo | 4 | 2 |
| 4 | F González | 6 | 4 | 6 | | | | | | | | | | A Calleri | 6 | 6 |
| | D Ferrer | 2 | 6 | 4 | 4 | F González | 6 | 6 | | | | | | | | |
| | J Acasuso | 6 | 6 | | | J Acasuso | 1 | 3 | | | | | | | | |
| | D Sánchez | 3 | 4 | | | | | | 4 | F González | 5 | 1 | | | | |
| | A Calleri | 6 | 6 | | | | | | | A Calleri | 7 | 6 | | | | |
| WC | D Rocha | 1 | 0 | | | A Calleri | 6 | 6 | | | | | | | | |
| WC | H Lopes | 6 | 1 | 1 | 8 | J Nieminen | 3 | 4 | | | | | | | | |
| 8 | J Nieminen | 4 | 6 | 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 | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 6 | N Davydenko | 6 | 6 | | | | | | | | | | | | | | | |
| | I Labadze | 1 | 0 | | 6 | Y Kafelnikov | 6 | 6 | | | | | | | | | | |
| | W Arthurs | 6 | 5 | 6$^1$ | | A Voinea | 3 | 0 | | | | | | | | | | |
| | A Voinea | 3 | 7 | 7$^7$ | | | | | | 6 | Y Kafelnikov | 2 | 4 | | | | | |
| | A Waske | 6 | 5 | 6 | | | | | | | N Davydenko | 6 | 6 | | | | | |
| LL | G Etlis | 2 | 7 | 4 | | A Waske | 3 | 6$^3$ | | | | | | | | | | |
| | N Davydenko | 6 | 6 | | | N Davydenko | 6 | 7$^7$ | | | | | | | | | | |
| 3 | S Schalken | 3 | 2 | | | | | | | | | | | | N Davydenko | 6 | 3 | 6 |
| 7 | M Mirnyi | 6 | 4 | 7 | | | | | | | | | | 7 | M Mirnyi | 4 | 6 | 3 |
| | A Martín | 0 | 6 | 5 | 7 | M Mirnyi | 3 | 6 | 6 | | | | | | | | | |
| Q | V Hănescu | 6 | 6 | | Q | V Hănescu | 6 | 3 | 4 | | | | | | | | | |
| Q | C Rochus | 3 | 2 | | | | | | | 7 | M Mirnyi | 7$^7$ | 6 | | | | | |
| | R Sluiter | 6$^1$ | 6 | 6$^3$ | | | | | | | F López | 6$^0$ | 4 | | | | | |
| WC | B Mota | 7$^7$ | 3 | 7$^7$ | WC | B Mota | 3 | 4 | | | | | | | | | | |
| | F López | 6 | 4 | 7 | | F López | 6 | 6 | | | | | | | | | | |
| 2 | R Schüttler | 1 | 6 | 5 | | | | | | | | | | | | | | |

## Qualifying
### Qualifying seeds

* Galo Blanco (qualifying competition, retired due to a stiff neck, lucky loser)
* Andrei Stoliarov (second round)
* Christophe Rochus (qualified)
* Fernando Verdasco (qualified)
* Tomáš Zíb (second round)
* Dick Norman (second round)
* Juan Antonio Marín (first round)
* Victor Hănescu (qualified)

### Qualifiers

* Harel Levy
* Victor Hănescu
* Christophe Rochus
* Fernando Verdasco

### Lucky losers

* Galo Blanco
* Gastón Etlis

### Qualifying draw
#### First qualifier

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 1 | Galo Blanco | 6 | 6 | | | | | | | | | |
| WC | Pedro Leão | 1 | 1 | | | | | | | | | |
| WC | Pedro Leão | 1 | 1 | | 1 | Galo Blanco | 6 | 6 | | | | |
| | | | | | | Julien Benneteau | 2 | 4 | | | | |
| | Sébastien de Chaunac | 3 | 3 | | | Julien Benneteau | 2 | 4 | | | | |
| | Julien Benneteau | 6 | 6 | | | | | | | | | |
| | Julien Benneteau | 6 | 6 | | | | | | 1 | Galo Blanco | 5 | r |
| | | | | | | | | | | Harel Levy | 7 | |
| | Harel Levy | 1 | 6 | 7$^8$ | | | | | | | | | Harel Levy | 7 |
| | Didac Pérez | 6 | 2 | 6$^6$ | | | | | | | | |
| | Didac Pérez | 6 | 2 | 6$^6$ | | Harel Levy | 7 | 6 | | | | |
| | | | | | 5 | Tomáš Zíb | 5 | 4 | | | | |
| | Florent Serra | 0 | 2 | | 5 | Tomáš Zíb | 5 | 4 | | | | |
| 5 | Tomáš Zíb | 6 | 6 | | | | | | | | | |

#### Second qualifier

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 2 | Andrei Stoliarov | 1 | 6 | 6 | | | | | | | | | |
| | Jan Frode Andersen | 6 | 3 | 4 | | | | | | | | | |
| | Jan Frode Andersen | 6 | 3 | 4 | 2 | Andrei Stoliarov | 3 | 2 | | | | | |
| | | | | | | Óscar Serrano | 6 | 6 | | | | | |
| | Francisco Costa | 1 | 2 | | | Óscar Serrano | 6 | 6 | | | | | |
| | Óscar Serrano | 6 | 6 | | | | | | | | | | |
| | Óscar Serrano | 6 | 6 | | | | | | | Óscar Serrano | 1 | 6 | 2 |
| | | | | | | | | | 8 | Victor Hănescu | 6 | 2 | 6 |
| WC | Rui Machado | 6$^9$ | 3 | | | | | | | | | | | 8 | Victor Hănescu | 6 | 2 | 6 |
| | Pavel Šnobel | 7$^{11}$ | 6 | | | | | | | | | | |
| | Pavel Šnobel | 7$^{11}$ | 6 | | | Pavel Šnobel | 4 | 2 | | | | | |
| | | | | | 8 | Victor Hănescu | 6 | 6 | | | | | |
| | Marc Fornell Mestres | 3 | 7 | 2 | 8 | Victor Hănescu | 6 | 6 | | | | | |
| 8 | Victor Hănescu | 6 | 5 | 6 | | | | | | | | | |

#### Third qualifier

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 3 | Christophe Rochus | 6 | 6 | | | | | | | | | | |
| | Álex Calatrava | 2 | 2 | | | | | | | | | | |
| | Álex Calatrava | 2 | 2 | 3 | Christophe Rochus | 3 | 6 | 6 | | | | | |
| | | | | | Jan Hájek | 6 | 4 | 4 | | | | | |
| | Jan Hájek | 6 | 7$^7$ | | Jan Hájek | 6 | 4 | 4 | | | | | |
| WC | Peter Rodrigues | 0 | 6$^1$ | | | | | | | | | | |
| WC | Peter Rodrigues | 0 | 6$^1$ | | | | | | 3 | Christophe Rochus | 7 | 6$^3$ | 6 |
| | | | | | | | | | | Gastón Etlis | 5 | 7$^7$ | 4 |
| | David Prinosil | 7 | 6 | | | | | | | | | | | Gastón Etlis | 5 | 7$^7$ | 4 |
| WC | Frederico Gil | 5 | 0 | | | | | | | | | | |
| WC | Frederico Gil | 5 | 0 | | David Prinosil | 1 | 2 | | | | | | |
| | | | | | Gastón Etlis | 6 | 6 | | | | | | |
| | Gastón Etlis | 7$^7$ | 6 | | Gastón Etlis | 6 | 6 | | | | | | |
| 7 | Juan Antonio Marín | 6$^4$ | 3 | | | | | | | | | | |

#### Fourth qualifier

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 4 | Fernando Verdasco | 6 | 6 | | | | | | | | | | |
| | Gilles Elseneer | 3 | 3 | | | | | | | | | | |
| | Gilles Elseneer | 3 | 3 | | 4 | Fernando Verdasco | 6 | 6 | | | | | |
| | | | | | | Marc-Kevin Goellner | 2 | 1 | | | | | |
| | Marc-Kevin Goellner | 3 | 7 | 6 | | Marc-Kevin Goellner | 2 | 1 | | | | | |
| | Juan Giner | 6 | 5 | 3 | | | | | | | | | |
| | Juan Giner | 6 | 5 | 3 | | | | | | 4 | Fernando Verdasco | 6 | 6 |
| | | | | | | | | | | | Christopher Kas | 3 | 3 |
| | Denis Gremelmayr | 4 | 4 | | | | | | | | | | | Christopher Kas | 3 | 3 |
| | Christopher Kas | 6 | 6 | | | | | | | | | | |
| | Christopher Kas | 6 | 6 | | | Christopher Kas | 4 | 7 | 6 | | | | |
| | | | | | 6 | Dick Norman | 6 | 5 | 1 | | | | |
| | Boris Pašanski | 1 | 7 | 2 | 6 | Dick Norman | 6 | 5 | 1 | | | | |
| 6 | Dick Norman | 6 | 5 | 6 | | | | | | | | | |