# 2004 BellSouth Open – Singles

David Sánchez was the defending champion but lost in the semifinals to Gustavo Kuerten.
Fernando González won in the final 7–5, 6–4 against Kuerten.

## Seeds

* Nicolás Massú (quarterfinals)
* Gustavo Kuerten (final)
* Mariano Zabaleta (quarterfinals)
* Gastón Gaudio (quarterfinals)
* Fernando González (champion)
* Juan Ignacio Chela (first round)
* Filippo Volandri (quarterfinals)
* Flávio Saretta (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 | Final | Final | Final | Final |
| 5 | Fernando González | 6 | 6 | | | | |
| 8 | Flávio Saretta | 2 | 3 | | | | |
| 8 | Flávio Saretta | 2 | 3 | 5 | Fernando González | 7 | 6 |
| | | | | 2 | Gustavo Kuerten | 5 | 4 |
| | David Sánchez | 6$^6$ | 4 | 2 | Gustavo Kuerten | 5 | 4 |
| 2 | Gustavo Kuerten | 7$^8$ | 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 |
| 1 | N Massú | 6 | 6 | | | | | | | | | | | | | | |
| | F Verdasco | 1 | 2 | | 1 | N Massú | 6 | 6 | | | | | | | | | |
| Q | F Čermák | 3 | 3 | | | H Levy | 2 | 4 | | | | | | | | | |
| | H Levy | 6 | 6 | | | | | | | 1 | N Massú | 6$^4$ | 3 | | | | |
| WC | A García | 6 | 6 | | | | | | | 5 | F González | 7$^7$ | 6 | | | | |
| Q | P Capdeville | 4 | 4 | | WC | A García | 5 | 1 | | | | | | | | | |
| | A Montañés | 1 | 5 | | 5 | F González | 7 | 6 | | | | | | | | | |
| 5 | F González | 6 | 7 | | | | | | | | | | | 5 | F González | 6 | 6 |
| 3 | M Zabaleta | 6 | 6 | | | | | | | | | | | 8 | F Saretta | 2 | 3 |
| | D Ferrer | 4 | 0 | | 3 | M Zabaleta | 6 | 4 | 6 | | | | | | | | |
| | R Ramírez Hidalgo | 6 | 3 | 6 | | R Ramírez Hidalgo | 3 | 6 | 1 | | | | | | | | |
| | T Behrend | 1 | 6 | 3 | | | | | | 3 | M Zabaleta | 3 | 4 | | | | |
| | L Horna | 6 | 7 | | | | | | | 8 | F Saretta | 6 | 6 | | | | |
| WC | G Hormazábal | 4 | 5 | | | L Horna | 1 | 0$^r$ | | | | | | | | | |
| WC | H Gamonal | 2 | 1 | | 8 | F Saretta | 6 | 1 | | | | | | | | | |
| 8 | F Saretta | 6 | 6 | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 6 | J I Chela | 4 | 2 | | | | | | | | | | | | | | |
| | D Sánchez | 6 | 6 | | | D Sánchez | 6 | 6 | | | | | | | | | |
| | I Miranda | 6 | 6 | | | I Miranda | 1 | 4 | | | | | | | | | |
| | M Vassallo Argüello | 4 | 3 | | | | | | | D Sánchez | 7 | 3 | 6 | | | | |
| | N Lapentti | 6$^5$ | 4 | | | | | | 4 | G Gaudio | 5 | 6 | 2 | | | | |
| | J Acasuso | 7$^7$ | 6 | | | J Acasuso | 3 | 3 | | | | | | | | | |
| | R Gasquet | 6 | 3 | 2 | 4 | G Gaudio | 6 | 6 | | | | | | | | | |
| 4 | G Gaudio | 3 | 6 | 6 | | | | | | | | | | | D Sánchez | 6$^6$ | 4 |
| 7 | F Volandri | 6 | 6 | | | | | | | | | | | 2 | G Kuerten | 7$^8$ | 6 |
| | A Portas | 0 | 4 | | 7 | F Volandri | 6 | 6 | | | | | | | | | |
| | G Blanco | 6 | 6 | | | G Blanco | 2 | 0 | | | | | | | | | |
| Q | J A Marín | 4 | 3 | | | | | | 7 | F Volandri | 1 | 6 | 6$^4$ | | | | |
| Q | F Squillari | 6 | 6 | | | | | | 2 | G Kuerten | 6 | 2 | 7$^7$ | | | | |
| | Ó Hernández | 4 | 1 | | Q | F Squillari | 1 | 6$^2$ | | | | | | | | | |
| | J-R Lisnard | 3 | 3 | | 2 | G Kuerten | 6 | 7$^7$ | | | | | | | | | |
| 2 | G Kuerten | 6 | 6 | | | | | | | | | | | | | | |