# 2004 ATP Buenos Aires – Singles

Carlos Moyá was the defending champion but lost in the final 6–4, 6–1 against Guillermo Coria.

## Seeds

* Guillermo Coria (champion)
* Carlos Moyá (final)
* Nicolás Massú (quarterfinals)
* Gustavo Kuerten (first round)
* Agustín Calleri (second round)
* Mariano Zabaleta (quarterfinals)
* Gastón Gaudio (first round)
* Juan Ignacio Chela (second 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 | Final | Final | Final | Final |
| 1 | Guillermo Coria | 7$^7$ | 6 | | | | |
| | Richard Gasquet | 6$^1$ | 1 | | | | |
| | Richard Gasquet | 6$^1$ | 1 | 1 | Guillermo Coria | 6 | 6 |
| | | | | 2 | Carlos Moyá | 4 | 1 |
| | José Acasuso | 6$^3$ | 5 | 2 | Carlos Moyá | 4 | 1 |
| 2 | Carlos Moyá | 7$^7$ | 7 | | | | |

### 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | G Coria | 6 | 6 | | | | | | | | | | | | | | | |
| | L Horna | 1 | 2 | | 1 | G Coria | 6 | 4 | 6 | | | | | | | | | |
| WC | F Squillari | 6 | 6 | | WC | F Squillari | 3 | 6 | 1 | | | | | | | | | |
| Q | M López | 0 | 1 | | | | | | | 1 | G Coria | 7$^{10}$ | 3 | 6 | | | | |
| | N Lapentti | 6$^2$ | 1 | | | | | | | WC | J Mónaco | 6$^8$ | 6 | 1 | | | | |
| WC | J Mónaco | 7$^7$ | 6 | | WC | J Mónaco | 7$^7$ | 6 | | | | | | | | | | |
| Q | G Lapentti | 5 | 0 | | 8 | J I Chela | 6$^4$ | 3 | | | | | | | | | | |
| 8 | J I Chela | 7 | 6 | | | | | | | | | | | | 1 | G Coria | 7$^7$ | 6 |
| 3 | N Massú | 6 | 6 | | | | | | | | | | | | | R Gasquet | 6$^1$ | 1 |
| | A Montañés | 1 | 3 | | 3 | N Massú | 6 | 6 | | | | | | | | | | |
| WC | G Cañas | 3 | 6 | 2 | | F Volandri | 2 | 4 | | | | | | | | | | |
| | F Volandri | 6 | 4 | 6 | | | | | | 3 | N Massú | 3 | 6 | 5 | | | | |
| | R Gasquet | 2 | 7 | 6 | | | | | | | R Gasquet | 6 | 4 | 7 | | | | |
| | F Verdasco | 6 | 5 | 1 | | R Gasquet | 7 | 6 | | | | | | | | | | |
| | G Blanco | 4 | 2 | | 5 | A Calleri | 5 | 2 | | | | | | | | | | |
| 5 | A Calleri | 6 | 6 | | | | | | | | | | | | | | | |

### 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 7 | G Gaudio | 3 | 6$^6$ | | | | | | | | | | | | | | | |
| | J Acasuso | 6 | 7$^8$ | | | J Acasuso | 3 | 7$^{11}$ | 6 | | | | | | | | | |
| Q | O Patience | 6 | 6 | | Q | O Patience | 6 | 6$^9$ | 4 | | | | | | | | | |
| | A Portas | 4 | 3 | | | | | | | | J Acasuso | 7 | 7$^7$ | | | | | |
| | F Saretta | 6 | 6 | | | | | | | | D Ferrer | 5 | 6$^5$ | | | | | |
| | T Behrend | 4 | 2 | | | F Saretta | 6$^1$ | 6 | 2 | | | | | | | | | |
| | D Ferrer | 6 | 7 | | | D Ferrer | 7$^7$ | 3 | 6 | | | | | | | | | |
| 4 | G Kuerten | 3 | 5 | | | | | | | | | | | | | J Acasuso | 6$^3$ | 5 |
| 6 | M Zabaleta | 6 | 6 | | | | | | | | | | | | 2 | C Moyá | 7$^7$ | 7 |
| | J-R Lisnard | 4 | 4 | | 6 | M Zabaleta | 6 | 6 | | | | | | | | | | |
| Q | D Moyano | 1 | 6 | 4 | | Ó Hernández | 1 | 4 | | | | | | | | | | |
| | Ó Hernández | 6 | 4 | 6 | | | | | | 6 | M Zabaleta | 6 | 6$^4$ | 4 | | | | |
| | R Ramírez Hidalgo | 6 | 0 | 1 | | | | | | 2 | C Moyá | 4 | 7$^7$ | 6 | | | | |
| | D Sánchez | 3 | 6 | 6 | | D Sánchez | 6$^5$ | 6 | 6$^5$ | | | | | | | | | |
| | H Levy | 2 | 4 | | 2 | C Moyá | 7$^7$ | 1 | 7$^7$ | | | | | | | | | |
| 2 | C Moyá | 6 | 6 | | | | | | | | | | | | | | | |