# 2004 Gerry Weber Open – Singles

Roger Federer was the defending champion, and won in the final 6–0, 6–3 against Mardy Fish. It was his second singles title in Halle. He did not lose a single set in the entire tournament.

## 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 (semifinals)
* Jiří Novák (semifinals)
* Martin Verkerk (first round)
* Marat Safin (first round)
* Mardy Fish (final)
* Andrei Pavel (first round)
* Feliciano López (first 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

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 1 | Roger Federer | 6 | 6 | | | | | |
| 3 | Jiří Novák | 3 | 4 | | | | | |
| 3 | Jiří Novák | 3 | 4 | | 1 | Roger Federer | 6 | 6 |
| | | | | | 6 | Mardy Fish | 0 | 3 |
| 6 | Mardy Fish | 6 | 4 | 7$^7$ | 6 | Mardy Fish | 0 | 3 |
| 2 | Rainer Schüttler | 4 | 6 | 6$^4$ | | | | |

### 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 | | | | | | | | | | | | | | |
| | T Johansson | 3 | 2 | | 1 | R Federer | 6 | 6 | | | | | | | | | |
| | F Mayer | 7$^7$ | 2 | 6$^2$ | | M Youzhny | 2 | 1 | | | | | | | | | |
| | M Youzhny | 6$^4$ | 6 | 7$^7$ | | | | | | 1 | R Federer | 6 | 7 | | | | |
| WC | A Waske | 1 | 4 | | | | | | | | A Clément | 3 | 5 | | | | |
| | A Clément | 6 | 6 | | | A Clément | 7$^7$ | 6 | | | | | | | | | |
| | A Popp | 1 | 6 | 6 | | A Popp | 6$^4$ | 2 | | | | | | | | | |
| 7 | A Pavel | 6 | 4 | 4 | | | | | | | | | | 1 | R Federer | 6 | 6 |
| 3 | J Novák | 6 | 6 | | | | | | | | | | | 3 | J Novák | 3 | 4 |
| | I Ljubičić | 2 | 2 | | 3 | J Novák | 6 | 6 | | | | | | | | | |
| Q | M Kratochvil | 2 | 2 | | LL | M Chiudinelli | 3 | 1 | | | | | | | | | |
| LL | M Chiudinelli | 6 | 6 | | | | | | | 3 | J Novák | 6 | 7$^7$ | | | | |
| | K Carlsen | 3 | 7$^7$ | 7 | | | | | | WC | T Haas | 4 | 6$^1$ | | | | |
| Q | M Berrer | 6 | 6$^5$ | 5 | | K Carlsen | 7$^7$ | 2 | 4 | | | | | | | | |
| WC | T Haas | 6 | 6 | | WC | T Haas | 6$^3$ | 6 | 6 | | | | | | | | |
| 8 | F López | 3 | 4 | | | | | | | | | | | | | | |

### 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 | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 6 | M Fish | 6 | 6 | | | | | | | | | | | | | | | |
| WC | D Prinosil | 4 | 2 | | 6 | M Fish | 6 | 6 | | | | | | | | | | |
| | F Volandri | 6 | 2 | 2 | | S Sargsian | 4 | 3 | | | | | | | | | | |
| | S Sargsian | 2 | 6 | 6 | | | | | | 6 | M Fish | 6 | 6 | | | | | |
| Q | A Seppi | 7$^7$ | 2 | 6 | | | | | | | F Verdasco | 2 | 2 | | | | | |
| | N Davydenko | 6$^5$ | 6 | 3 | Q | A Seppi | 3 | 4 | | | | | | | | | | |
| | F Verdasco | 7 | 7 | | | F Verdasco | 6 | 6 | | | | | | | | | | |
| 4 | M Verkerk | 5 | 5 | | | | | | | | | | | 6 | M Fish | 6 | 4 | 7$^7$ |
| 5 | M Safin | 2 | 7$^7$ | 6$^4$ | | | | | | | | | | 2 | R Schüttler | 4 | 6 | 6$^4$ |
| | J Björkman | 6 | 6$^3$ | 7$^7$ | | J Björkman | 7 | 4 | 4 | | | | | | | | | |
| | L Burgsmüller | 3 | 4 | | | N Kiefer | 5 | 6 | 6 | | | | | | | | | |
| | N Kiefer | 6 | 6 | | | | | | | | N Kiefer | 3 | 6$^2$ | | | | | |
| | J Johansson | 7$^7$ | 4 | 6 | | | | | | 2 | R Schüttler | 6 | 7$^7$ | | | | | |
| | R Söderling | 6$^3$ | 6 | 3 | | J Johansson | 6$^5$ | 4 | | | | | | | | | | |
| Q | J Hernych | 3 | 2 | | 2 | R Schüttler | 7$^7$ | 6 | | | | | | | | | | |
| 2 | R Schüttler | 6 | 6 | | | | | | | | | | | | | | | |