# 2003 BMW Open – Singles

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. He did not lose a single set in the entire tournament.

## Seeds

* 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)

## 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 | 6 | 6 | | | | |
| | Stefan Koubek | 2 | 1 | | | | |
| | Stefan Koubek | 2 | 1 | 1 | Roger Federer | 6 | 6 |
| | | | | 8 | Jarkko Nieminen | 1 | 4 |
| 5 | Yevgeny Kafelnikov | 4 | 1$^r$ | 8 | Jarkko Nieminen | 1 | 4 |
| 8 | Jarkko Nieminen | 6 | 0 | | | | |

### 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 |
| 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 | | | | | | | | | | | | | |

### Bottom half

| 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 | Y Kafelnikov | 6 | 6 | | | | | | | | | | | | | | |
| | O Rochus | 3 | 2 | 5 | Y Kafelnikov | 7 | 4 | 6 | | | | | | | | | |
| | A Voinea | 5 | 6$^2$ | | A Waske | 5 | 6 | 3 | | | | | | | | | |
| | A Waske | 7 | 7$^7$ | | | | | | 5 | Y Kafelnikov | 6$^2$ | 7 | 6 | | | | |
| | T Behrend | 6$^4$ | 5 | | | | | | 3 | S Schalken | 7$^7$ | 5 | 3 | | | | |
| | W Arthurs | 7$^7$ | 7 | | W Arthurs | 6$^4$ | 3 | | | | | | | | | | |
| | L Burgsmüller | 3 | 1 | 3 | S Schalken | 7$^7$ | 6 | | | | | | | | | | |
| 3 | S Schalken | 6 | 6 | | | | | | | | | | | 5 | Y Kafelnikov | 4 | 1$^r$ |
| 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 | | | | | | | | | | | | | | |