2003 Gerry Weber Open – Singles
# 2003 Gerry Weber Open – Singles

Yevgeny Kafelnikov was the defending champion but lost in the first round to Karol Kučera.

Roger Federer won in the final 6–1, 6–3 against Nicolas Kiefer.

## Seeds

A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.

* Roger Federer (champion)
* Rainer Schüttler (second round)
* Jiří Novák (quarterfinals)
* Yevgeny Kafelnikov (first round)
* Younes El Aynaoui (quarterfinals)
* Mikhail Youzhny (semifinals)
* Nikolay Davydenko (first round)
* Arnaud Clément (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

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| - | - | - | - | - | - | - | - | - |
| 1 | Roger Federer | 4 | $7^7$ | 6 | | | | |
| 6 | Mikhail Youzhny | 6 | $6^4$ | 2 | | | | |
| 6 | Mikhail Youzhny | 6 | $6^4$ | 2 | 1 | Roger Federer | 6 | 6 |
| | | | | | | Nicolas Kiefer | 1 | 3 |
| 8 | Arnaud Clément | 6 | $6^4$ | 4 | | Nicolas Kiefer | 1 | 3 |
| | Nicolas Kiefer | 4 | $7^7$ | 6 | | | | |

### 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 | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 1 | R Federer | 7 | 6 | | | | | | | | | | | | | | | |
| | S Sargsian | 5 | 1 | | 1 | R Federer | 4 | 6 | 6 | | | | | | | | | |
| | H-T Lee | 4 | 0 | | | F Vicente | 6 | 2 | 1 | | | | | | | | | |
| | F Vicente | 6 | 6 | | | | | | | 1 | R Federer | 7 | $7^7$ | | | | | |
| | L Burgsmüller | 6 | 5 | 6 | | | | | | 5 | Y El Aynaoui | 5 | $6^3$ | | | | | |
| Q | J-C Scherrer | 4 | 7 | 4 | | L Burgsmüller | 3 | 3 | | | | | | | | | | |
| WC | C Koderisch | 1 | 2 | | 5 | Y El Aynaoui | 6 | 6 | | | | | | | | | | |
| 5 | Y El Aynaoui | 6 | 6 | | | | | | | | | | | 1 | R Federer | 4 | $7^7$ | 6 |
| 3 | J Novák | 6 | 6 | | | | | | | | | | | 6 | M Youzhny | 6 | $6^4$ | 2 |
| WC | H Dreekmann | 2 | 4 | | 3 | J Novák | 6 | 6 | | | | | | | | | | |
| | S Koubek | 6 | 6 | | | S Koubek | 4 | 3 | | | | | | | | | | |
| Q | Y Allegro | 4 | 3 | | | | | | | 3 | J Novák | 4 | 4 | | | | | |
| WC | M Abel | 3 | 4 | | | | | | | 6 | M Youzhny | 6 | 6 | | | | | |
| | J Björkman | 6 | 6 | | | J Björkman | 4 | 5 | | | | | | | | | | |
| | P-H Mathieu | 6 | 1 | $2^r$ | 6 | M Youzhny | 6 | 7 | | | | | | | | | | |
| 6 | M Youzhny | 1 | 6 | 5 | | | | | | | | | | | | | | |

### 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 | Semifinals |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 8 | A Clément | 6 | 6 | | | | | | | | | | | | | | | | |
| Q | F Niemeyer | 3 | 0 | | 8 | A Clément | 6 | 6 | | | | | | | | | | | |
| | I Ljubičić | $7^7$ | 6 | | | I Ljubičić | 4 | 2 | | | | | | | | | | | |
| Q | D Prinosil | $6^5$ | 2 | | | | | | | 8 | A Clément | 7 | $6^5$ | $7^8$ | | | | | |
| | F Santoro | 6 | 4 | 6 | | | | | | | K Kučera | 5 | $7^7$ | $6^6$ | | | | | |
| | B Vahaly | 2 | 6 | 3 | | F Santoro | 3 | 3 | | | | | | | | | | | |
| | K Kučera | 6 | $6^8$ | $7^7$ | | K Kučera | 6 | 6 | | | | | | | | | | | |
| 4 | Y Kafelnikov | 1 | $7^{10}$ | $6^5$ | | | | | | | | | | | 8 | A Clément | 6 | $6^4$ | 4 |
| 7 | N Davydenko | $6^5$ | 3 | | | | | | | | | | | | | N Kiefer | 4 | $7^7$ | 6 |
| | F López | $7^7$ | 6 | | | F López | 1 | 6 | 5 | | | | | | | | | | |
| | N Kiefer | 6 | 6 | | | N Kiefer | 6 | 3 | 7 | | | | | | | | | | |
| | O Rochus | 3 | 0 | | | | | | | | N Kiefer | 7 | 6 | | | | | | |
| | N Escudé | 6 | 3 | $0^r$ | | | | | | | R Štěpánek | 5 | 3 | | | | | | |
| | R Štěpánek | 3 | 6 | 3 | | R Štěpánek | 6 | $6^6$ | 6 | | | | | | | | | | |
| | K Carlsen | 3 | 4 | | 2 | R Schüttler | 4 | $7^8$ | 3 | | | | | | | | | | |
| 2 | R Schüttler | 6 | 6 | | | | | | | | | | | | | | | | |
