# 2003 Allianz Suisse Open Gstaad – Singles

Àlex Corretja was the defending champion but lost in the second round to David Sánchez.
Jiří Novák won in the final 5–7, 6–3, 6–3, 1–6, 6–3 against Roger Federer.
This tournament was also notable for being the first ATP tournament in which future Grand Slam Champion Stanislas Wawrinka competed in the main draw. He drew Jean-René Lisnard in the first round and was defeated.

## Seeds

A champion seed is indicated in bold while text in italics indicates the round in which that seed was eliminated.
* Roger Federer (final)
* Rainer Schüttler (quarterfinals)
* Jiří Novák (champion)
* Gastón Gaudio (semifinals)
* Juan Ignacio Chela (quarterfinals)
* Nikolay Davydenko (first round)
* Àlex Corretja (second round)
* Radek Štěpánek (semifinals)

## 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 |
| 1 | Roger Federer | 7 | 3 | 3 | 6 | 3 |
| 3 | Jiří Novák | 5 | 6 | 6 | 1 | 6 |

### Section 1

| 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 |
| 1 | R Federer | 6 | 6$^4$ | 6 | | | | | | | | | | | | | |
| Q | M López | 3 | 7$^7$ | 3 | 1 | R Federer | 6 | 6 | | | | | | | | | |
| WC | S Wawrinka | 6 | 1 | 5 | | J-R Lisnard | 1 | 2 | | | | | | | | | |
| | J-R Lisnard | 2 | 6 | 7 | | | | | | 1 | R Federer | w/o | | | | | |
| | D Sánchez | 6 | 7 | | | | | | | | D Sánchez | | | | | | |
| | K Beck | 4 | 5 | | | D Sánchez | 6 | 6 | | | | | | | | | |
| | J van Lottum | 1 | 2 | | WC/7 | À Corretja | 4 | 4 | | | | | | | | | |
| WC/7 | À Corretja | 6 | 6 | | | | | | | | | | | 1 | R Federer | 6 | 7$^8$ |
| 4 | G Gaudio | 6 | 6 | | | | | | | | | | | 4 | G Gaudio | 1 | 6$^6$ |
| | K Vliegen | 3 | 4 | | 4 | G Gaudio | 4 | 6 | 6 | | | | | | | | |
| | L Burgsmüller | 6 | 6$^6$ | 6 | | L Burgsmüller | 6 | 2 | 4 | | | | | | | | |
| | Ž Krajan | 2 | 7$^8$ | 1 | | | | | | 4 | G Gaudio | 6 | 6 | | | | |
| Q | G Blanco | 1 | 6 | 3 | | | | | | | S Koubek | 3 | 1 | | | | |
| | S Koubek | 6 | 1 | 6 | | S Koubek | 6 | 6 | | | | | | | | | |
| | A Dupuis | 7$^7$ | 7$^7$ | | | A Dupuis | 1 | 2 | | | | | | | | | |
| 6 | N Davydenko | 6$^1$ | 6$^4$ | | | | | | | | | | | | | | |

### 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| 5 | J I Chela | 6 | 6 | | | | | | | | | | | | | | |
| | A Sá | 0 | 2 | | 5 | J I Chela | 6 | 6$^2$ | 7$^7$ | | | | | | | | |
| | F López | 6 | 6 | | | F López | 4 | 7$^7$ | 6$^3$ | | | | | | | | |
| | I Labadze | 0 | 2 | | | | | | | 6 | J I Chela | 3 | 3 | | | | |
| | P-H Mathieu | 6 | 6 | | | | | | | 3 | J Novák | 6 | 6 | | | | |
| Q | P Kohlschreiber | 3 | 1 | | | P-H Mathieu | 6 | 2 | 3 | | | | | | | | |
| | S Sargsian | 3 | 3 | | 3 | J Novák | 1 | 6 | 6 | | | | | | | | |
| 3 | J Novák | 6 | 6 | | | | | | | | | | | 3 | J Novák | 7 | 6 |
| 8 | R Štěpánek | 6 | 6 | | | | | | | | | | | 8 | R Štěpánek | 5 | 1 |
| Q | H Armando | 3 | 3 | | 8 | R Štěpánek | 6 | 7$^7$ | | | | | | | | | |
| | T Behrend | 4 | 7$^8$ | 2 | | M Kratochvil | 3 | 6$^5$ | | | | | | | | | |
| | M Kratochvil | 6 | 6$^6$ | 6 | | | | | | 8 | R Štěpánek | 6 | 6 | | | | |
| WC | M Lammer | 3 | 5 | | | | | | | 2 | R Schüttler | 4 | 2 | | | | |
| | C Rochus | 6 | 7 | | | C Rochus | 3 | 6$^6$ | | | | | | | | | |
| | W Arthurs | 2 | 3 | | 2 | R Schüttler | 6 | 7$^8$ | | | | | | | | | |
| 2 | R Schüttler | 6 | 6 | | | | | | | | | | | | | | |