# 2003 Davidoff Swiss Indoors – Singles

David Nalbandian was the defending champion but lost the final on a walkover against Guillermo Coria.

## Seeds

A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.
* Andy Roddick (semifinals)
* Roger Federer (second round)
* Guillermo Coria (champion)
* David Nalbandian (final, withdrew because of a left wrist injury)
* Jiří Novák (second round)
* Mark Philippoussis (withdrew)
* Martin Verkerk (first round)
* Tommy Robredo (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
* NB: The Final was the best of 5 sets while all other rounds were the best of 3 sets.

### Final

| Final | Final | Final | Final | Final | Final | Final |
| 4 | David Nalbandian | | | | | |
| 3 | Guillermo Coria | w/o | | | | |

### Section 1

| 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 | A Roddick | 6 | 7$^7$ | | | | | | | | | | | | | |
| WC | J-C Scherrer | 3 | 6$^4$ | | 1 | A Roddick | 6 | 7$^7$ | | | | | | | | |
| | H-T Lee | 2 | 0 | | Q | G Elseneer | 3 | 6$^5$ | | | | | | | | |
| Q | G Elseneer | 6 | 6 | | | | | | 1 | A Roddick | 6 | 6 | | | | |
| | O Rochus | 6$^4$ | 6 | 7$^{12}$ | | | | | | O Rochus | 4 | 4 | | | | |
| | F Mantilla | 7$^7$ | 2 | 6$^{10}$ | | O Rochus | 7 | 6 | | | | | | | | |
| WC | M Kratochvil | 4 | 4 | | 8 | T Robredo | 5 | 1 | | | | | | | | |
| 8 | T Robredo | 6 | 6 | | | | | | | | | | 1 | A Roddick | 5 | 5 |
| 4 | D Nalbandian | 6 | 6 | | | | | | | | | | 4 | D Nalbandian | 7 | 7 |
| | R Ramírez Hidalgo | 4 | 0 | | 4 | D Nalbandian | 4 | | | | | | | | | |
| | A Clément | 6 | 7$^7$ | | | A Clément | 1$^r$ | | | | | | | | | |
| | P-H Mathieu | 4 | 6$^4$ | | | | | | 4 | D Nalbandian | 6 | 6 | | | | |
| LL | T Zíb | 7$^7$ | 7$^7$ | | | | | | | T Henman | 2 | 4 | | | | |
| WC | S Wawrinka | 6$^0$ | 6$^5$ | | LL | T Zíb | 3 | 4 | | | | | | | | |
| | T Henman | 6 | 6 | | | T Henman | 6 | 6 | | | | | | | | |
| 7 | M Verkerk | 2 | 3 | | | | | | | | | | | | | |

### Section 2

| 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 | J Novák | 3 | 6 | 6 | | | | | | | | | | | | | | |
| Q | A Parmar | 6 | 3 | 0 | 5 | J Novák | 6 | 5 | 4 | | | | | | | | | |
| | R Nadal | 6 | 3 | 6$^4$ | | F López | 3 | 7 | 6 | | | | | | | | | |
| | F López | 3 | 6 | 7$^7$ | | | | | | | F López | 1 | 2 | | | | | |
| Q | M Llodra | 6 | 6 | | | | | | | 3 | G Coria | 6 | 6 | | | | | |
| | B Ulihrach | 3 | 4 | | Q | M Llodra | 2 | 7$^7$ | 6$^4$ | | | | | | | | | |
| | F Santoro | 7 | 3 | 0 | 3 | G Coria | 6 | 6$^5$ | 7$^7$ | | | | | | | | | |
| 3 | G Coria | 5 | 6 | 6 | | | | | | | | | | | 3 | G Coria | 6 | 6 |
| LL | I Heuberger | 3 | 6 | 5 | | | | | | | | | | | | I Ljubičić | 4 | 4 |
| | N Lapentti | 6 | 4 | 7 | | N Lapentti | 7$^7$ | 6 | | | | | | | | | | |
| | T Behrend | 1 | 6 | 6 | | T Behrend | 6$^2$ | 1 | | | | | | | | | | |
| | J Blake | 6 | 3 | 4 | | | | | | | N Lapentti | 6 | 2 | 3 | | | | |
| | F Volandri | 3 | 6 | 2 | | | | | | | I Ljubičić | 2 | 6 | 6 | | | | |
| | I Ljubičić | 6 | 3 | 6 | | I Ljubičić | 7$^7$ | 6$^5$ | 6 | | | | | | | | | |
| WC | M Rosset | 1 | 3 | | 2 | R Federer | 6$^5$ | 7$^7$ | 4 | | | | | | | | | |
| 2 | R Federer | 6 | 6 | | | | | | | | | | | | | | | |