| Singles | |
|---|---|
| 2003 BMW Open | |
| Champion |  Roger Federer |
| Runner-up |  Jarkko Nieminen |
| Final score | 6–1, 6–4 |
| Draw | 32 (4 Q / 3 WC ) |
| Seeds | 8 |
Younes El Aynaoui was the defending champion but did not compete that year.
Roger Federer won in the final 6–1, 6–4 against Jarkko Nieminen.
Roger Federer (champion)
Paradorn Srichaphan (second round)
Sjeng Schalken (quarterfinals)
Rainer Schüttler (quarterfinals)
Yevgeny Kafelnikov (semifinals, retired because of a neck injury) Mikhail Youzhny (quarterfinals)
Tim Henman (second round) Jarkko Nieminen (final)| Semifinals | Final | ||||||||||||
| 1 | Roger Federer | 6 | 6 | ||||||||||
 Stefan Koubek | 2 | 1 | |||||||||||
| 1 | Roger Federer | 6 | 6 | ||||||||||
| 8 | Jarkko Nieminen | 1 | 4 | ||||||||||
| 5 | Yevgeny Kafelnikov | 4 | 1r | ||||||||||
| 8 | Jarkko Nieminen | 6 | 0 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | R Federer | 6 | 6 | ||||||||||||||||||||||||
 Ž Krajan | 4 | 3 | 1 | R Federer | 6 | 6 | |||||||||||||||||||||
| R Sluiter | 7 | 6 | R Sluiter | 4 | 3 | ||||||||||||||||||||||
| Q |  R Furlan | 5 | 4 | 1 | R Federer | 6 | 6 | ||||||||||||||||||||
| Q |  H Levy | 6 | 6 | 6 | M Youzhny | 2 | 3 | ||||||||||||||||||||
 K Carlsen | 3 | 1 | Q | H Levy | 6 | 4 | 1 | ||||||||||||||||||||
| Q |  J F Andersen | 6 | 5 | 3 | 6 | M Youzhny | 3 | 6 | 6 | ||||||||||||||||||
| 6 | M Youzhny | 4 | 7 | 6 | 1 | R Federer | 6 | 6 | |||||||||||||||||||
| 4 | R Schüttler | 6 | 6 | S Koubek | 2 | 1 | |||||||||||||||||||||
| J Melzer | 4 | 3 | 4 | R Schüttler | 4 | 6 | 6 | ||||||||||||||||||||
| N Davydenko | 7 | 6 | N Davydenko | 6 | 2 | 3 | |||||||||||||||||||||
 C Mamiit | 5 | 1 | 4 | R Schüttler | 3 | 4 | |||||||||||||||||||||
| S Koubek | 7 | 6 | S Koubek | 6 | 6 | ||||||||||||||||||||||
| WC | B Phau | 5 | 4 | S Koubek | 6 | 6 | |||||||||||||||||||||
 N Lapentti | 5 | 6 | 1 | WC/7 | T Henman | 4 | 0 | ||||||||||||||||||||
| WC/7 | T Henman | 7 | 4 | 6 | |||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | Y Kafelnikov | 6 | 6 | ||||||||||||||||||||||||
 O Rochus | 3 | 2 | 5 | Y Kafelnikov | 7 | 4 | 6 | ||||||||||||||||||||
 A Voinea | 5 | 62 | A Waske | 5 | 6 | 3 | |||||||||||||||||||||
| A Waske | 7 | 77 | 5 | Y Kafelnikov | 62 | 7 | 6 | ||||||||||||||||||||
| T Behrend | 64 | 5 | 3 | S Schalken | 77 | 5 | 3 | ||||||||||||||||||||
 W Arthurs | 77 | 7 | W Arthurs | 64 | 3 | ||||||||||||||||||||||
| L Burgsmüller | 3 | 1 | 3 | S Schalken | 77 | 6 | |||||||||||||||||||||
| 3 | S Schalken | 6 | 6 | 5 | Y Kafelnikov | 4 | 1r | ||||||||||||||||||||
| 8 | J Nieminen | 6 | 6 | 8 | J Nieminen | 6 | 0 | ||||||||||||||||||||
 I Labadze | 2 | 3 | 8 | J Nieminen | 6 | 6 | |||||||||||||||||||||
 J-R Lisnard | 6 | 6 | J-R Lisnard | 3 | 0 | ||||||||||||||||||||||
| Q | M Verkerk | 2 | 4 | 8 | J Nieminen | 6 | 6 | ||||||||||||||||||||
 O Mutis | 3 | 2 |  R Štěpánek | 1 | 1 | ||||||||||||||||||||||
| R Štěpánek | 6 | 6 | R Štěpánek | 6 | 6 | ||||||||||||||||||||||
| WC | M Kohlmann | 4 | 1 | 2 | P Srichaphan | 3 | 2 | ||||||||||||||||||||
| 2 | P Srichaphan | 6 | 6 | ||||||||||||||||||||||||
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