# 2004 Adidas International – Men's singles

Hyung-Taik Lee was the defending champion but did not compete that year.
Lleyton Hewitt won the final 4–3 after Carlos Moyá was forced to retire.

## Seeds

A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.
* Juan Carlos Ferrero (first round)
* Rainer Schüttler (first round)
* Carlos Moyá (final)
* Mark Philippoussis (quarterfinals)
* Paradorn Srichaphan (second round)
* Nicolás Massú (first round)
* Lleyton Hewitt (champion)
* Martin Verkerk (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
| 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 | Final | Final | Final | Final |
| 1 | J C Ferrero | 3 | 6$^6$ | | | | | | | | | | | | | | | | | | | |
| WC | C Guccione | 6 | 7$^8$ | | WC | C Guccione | 6$^4$ | 5 | | | | | | | | | | | | | | |
| | W Ferreira | 6 | 6 | | | W Ferreira | 7$^7$ | 7 | | | | | | | | | | | | | | |
| | J Blake | 2 | 4 | | | | | | | | W Ferreira | 6 | 6 | | | | | | | | | |
| Q | R Gasquet | 0 | r | | | | | | | WC | T Reid | 4 | 4 | | | | | | | | | |
| | F Mantilla | 3 | | | | F Mantilla | 4 | 1 | | | | | | | | | | | | | | |
| WC | T Reid | 7$^7$ | 2 | 6 | WC | T Reid | 6 | 6 | | | | | | | | | | | | | | |
| 6 | N Massú | 6$^5$ | 6 | 3 | | | | | | | | | | | | W Ferreira | 2 | 1 | | | | |
| 3 | C Moyá | 7 | 6 | | | | | | | | | | | | 3 | C Moyá | 6 | 6 | | | | |
| Q | A Bogomolov Jr. | 5 | 4 | | 3 | C Moyá | 7$^7$ | 6 | | | | | | | | | | | | | | |
| SE | M Llodra | 6 | 6 | | SE | M Llodra | 6$^5$ | 3 | | | | | | | | | | | | | | |
| | M Youzhny | 4 | 2 | | | | | | | 3 | C Moyá | 6 | 6 | | | | | | | | | |
| | T Robredo | 6 | 6 | | | | | | | | T Robredo | 1 | 2 | | | | | | | | | |
| | A Costa | 2 | 3 | | | T Robredo | 4 | 6 | 7$^7$ | | | | | | | | | | | | | |
| | J Björkman | 5 | 6 | 1 | 5 | P Srichaphan | 6 | 1 | 6$^3$ | | | | | | | | | | | | | |
| 5 | P Srichaphan | 7 | 1 | 6 | | | | | | | | | | | | | | | 3 | Carlos Moyá | 3 | r |
| 8 | M Verkerk | 6 | 6 | | | | | | | | | | | | | | | | 7 | Lleyton Hewitt | 4 | |
| WC | W Arthurs | 4 | 4 | | 8 | M Verkerk | 6$^0$ | 7$^8$ | 7$^7$ | | | | | | | | | | | | | |
| | A Calleri | 5 | 3 | | | M Mirnyi | 7$^7$ | 6$^6$ | 6$^5$ | | | | | | | | | | | | | |
| | M Mirnyi | 7 | 6 | | | | | | | 8 | M Verkerk | 6 | 7$^7$ | | | | | | | | | |
| | G Rusedski | 7$^7$ | 7$^7$ | | | | | | | 4 | M Philippoussis | 4 | 6$^4$ | | | | | | | | | |
| | J I Chela | 6$^1$ | 6$^5$ | | | G Rusedski | 3 | 6 | 4 | | | | | | | | | | | | | |
| Q | R Ramírez Hidalgo | 4 | 7 | 2 | 4 | M Philippoussis | 6 | 1 | 6 | | | | | | | | | | | | | |
| 4 | M Philippoussis | 6 | 5 | 6 | | | | | | | | | | | 8 | M Verkerk | 2 | r | | | | |
| 7 | L Hewitt | 6 | 6 | | | | | | | | | | | | 7 | L Hewitt | 6 | | | | | |
| | S Sargsian | 4 | 2 | | 7 | L Hewitt | 6 | 6 | | | | | | | | | | | | | | |
| | F López | 7$^7$ | 6$^4$ | 3 | | K Kučera | 4 | 1 | | | | | | | | | | | | | | |
| | K Kučera | 6$^3$ | 7$^7$ | 6 | | | | | | 7 | L Hewitt | 6 | 4 | 6 | | | | | | | | |
| | A Clément | 6 | 6 | | | | | | | | A Clément | 1 | 6 | 3 | | | | | | | | |
| | M Fish | 3 | 3 | | | A Clément | 6 | 7 | | | | | | | | | | | | | | |
| Q | J Johansson | 6 | 6 | | Q | J Johansson | 4 | 5 | | | | | | | | | | | | | | |
| 2 | R Schüttler | 4 | 4 | | | | | | | | | | | | | | | | | | | |