# 2003 Open 13 – Singles

Thomas Enqvist was the defending champion but lost in the first round to Raemon Sluiter.
Roger Federer won in the final 6–2, 7–6$^{(8–6)}$ against Jonas Björkman.

## Seeds

* Roger Federer (champion)
* Jiří Novák (first round)
* Sébastien Grosjean (second round)
* Rainer Schüttler (withdrew because of an elbow injury)
* Younes El Aynaoui (first round)
* Yevgeny Kafelnikov (first round)
* Fabrice Santoro (first round)
* Tommy Robredo (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 | Final | Final | Final | Final |
| 1 | Roger Federer | 7$^7$ | 6 | | | | |
| | Karol Kučera | 6$^5$ | 3 | | | | |
| | Karol Kučera | 6$^5$ | 3 | 1 | Roger Federer | 6 | 7$^8$ |
| | | | | | Jonas Björkman | 2 | 6$^6$ |
| | Jonas Björkman | w/o | | | Jonas Björkman | 2 | 6$^6$ |
| | Nicolas Escudé | | | | | | |

### 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 |
| 1 | R Federer | 7$^7$ | 0 | | | | | | | | | | | | | | | |
| | I Ljubičić | 6$^3$ | 0$^r$ | | 1 | R Federer | 6 | 6 | | | | | | | | | | |
| | J Nieminen | 6 | 4 | 7$^7$ | | J Nieminen | 3 | 3 | | | | | | | | | | |
| | R Štěpánek | 2 | 6 | 6$^1$ | | | | | | 1 | R Federer | 6 | 4 | 6 | | | | |
| | R Sluiter | 7$^7$ | 7$^8$ | | | | | | | | R Sluiter | 4 | 6 | 4 | | | | |
| | T Enqvist | 6$^4$ | 6$^6$ | | | R Sluiter | 7 | 6$^1$ | 6 | | | | | | | | | |
| Q | C Saulnier | 2 | 6 | 6 | Q | C Saulnier | 5 | 7$^7$ | 2 | | | | | | | | | |
| 7 | F Santoro | 6 | 4 | 1 | | | | | | | | | | | 1 | R Federer | 7$^7$ | 6 |
| 3 | S Grosjean | 6 | 6 | | | | | | | | | | | | | K Kučera | 6$^5$ | 3 |
| Q | Á Calatrava | 2 | 1 | | 3 | S Grosjean | 6$^4$ | 1 | | | | | | | | | | |
| | M Kratochvil | 6 | 4 | 1$^r$ | | K Kučera | 7$^7$ | 6 | | | | | | | | | | |
| | K Kučera | 3 | 6 | 4 | | | | | | | K Kučera | 6 | 6 | | | | | |
| WC | R Gasquet | 6$^4$ | 6 | 6 | | | | | | | O Rochus | 3 | 3 | | | | | |
| | F López | 7$^7$ | 4 | 4 | WC | R Gasquet | 7$^7$ | 0$^r$ | | | | | | | | | | |
| | O Rochus | 7$^7$ | 6 | | | O Rochus | 6$^1$ | 5 | | | | | | | | | | |
| WC/6 | Y Kafelnikov | 6$^5$ | 4 | | | | | | | | | | | | | | | |

### 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 |
| WC/5 | Y El Aynaoui | 2 | 4 | | | | | | | | | | | | |
| | J Björkman | 6 | 6 | | | J Björkman | 7$^8$ | 6$^6$ | 6 | | | | | | |
| | W Arthurs | 4 | 6$^4$ | | | A Voinea | 6$^6$ | 7$^8$ | 3 | | | | | | |
| | A Voinea | 6 | 7$^7$ | | | | | | | | J Björkman | 7$^9$ | 6 | | |
| | D Hrbatý | 6 | 6 | | | | | | | | D Hrbatý | 6$^7$ | 4 | | |
| Q | H Arazi | 1 | 3 | | | D Hrbatý | 6 | 6 | | | | | | | |
| | O Mutis | 6 | 2 | 7 | | O Mutis | 3 | 4 | | | | | | | |
| LL | C Vinck | 4 | 6 | 5 | | | | | | | | | | J Björkman | w/o |
| 8 | T Robredo | 6$^6$ | 6 | 6$^5$ | | | | | | | | | | N Escudé | |
| | M Mirnyi | 7$^8$ | 1 | 7$^7$ | | M Mirnyi | 6$^5$ | 2 | | | | | | | |
| Q | R Cadart | 6 | 6 | | Q | R Cadart | 7$^7$ | 6 | | | | | | | |
| | I Labadze | 4 | 3 | | | | | | | Q | R Cadart | 5 | 3 | | |
| | A Dupuis | 7$^7$ | 4 | 4 | | | | | | | N Escudé | 7 | 6 | | |
| | M Ančić | 6$^4$ | 6 | 6 | | M Ančić | 2 | 6 | 6$^{10}$ | | | | | | |
| | N Escudé | 6 | 6 | | | N Escudé | 6 | 3 | 7$^{12}$ | | | | | | |
| 2 | J Novák | 2 | 1 | | | | | | | | | | | | |