# 2009 Copa Petrobras Buenos Aires – Singles

Martín Vassallo Argüello chose to not defend his 2008 title. Horacio Zeballos won in the final 6–2, 3–6, 6–3, against Gastón Gaudio.

## Seeds

* Horacio Zeballos (champion)
* Máximo González (quarterfinals)
* Nicolás Massú (first round)
* Juan Ignacio Chela (semifinals)
* Santiago Ventura (quarterfinals)
* Sergio Roitman (second round)
* Rubén Ramírez Hidalgo (second round)
* Laurent Recouderc (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 | Final | Final | Final | Final | Final |
| 1 | Horacio Zeballos | 6 | 6 | | | | | |
| | Júlio Silva | 3 | 3 | | | | | |
| | Júlio Silva | 3 | 3 | 1 | Horacio Zeballos | 6 | 3 | 6 |
| | | | | | Gastón Gaudio | 2 | 6 | 3 |
| 4 | Juan Ignacio Chela | 4 | 2 | | Gastón Gaudio | 2 | 6 | 3 |
| | Gastón Gaudio | 6 | 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | H Zeballos | 6 | 4 | 6 | | | | | | | | | | | | | | |
| | R Hocevar | 4 | 6 | 4 | 1 | H Zeballos | 7 | 6$^8$ | 6 | | | | | | | | | |
| WC | M Puerta | 6 | 6 | | WC | M Puerta | 5 | 7 | 3 | | | | | | | | | |
| Q | A Molteni | 4 | 3 | | | | | | | 1 | H Zeballos | 6 | 5 | 7 | | | | |
| | B Dabul | 6 | 6 | | | | | | | | B Dabul | 2 | 7 | 6$^5$ | | | | |
| WC | G Pella | 4 | 3 | | | B Dabul | 7 | 2 | 6 | | | | | | | | | |
| | F Ferreiro | 2 | 4 | | 7 | R Ramírez Hidalgo | 6$^6$ | 6 | 3 | | | | | | | | | |
| 7 | R Ramírez Hidalgo | 6 | 6 | | | | | | | | | | | | 1 | H Zeballos | 6 | 6 |
| 3 | N Massú | 3 | 1 | r | | | | | | | | | | | | J Silva | 3 | 3 |
| | D Muñoz-De La Nava | 6 | 2 | | | D Muñoz-De La Nava | 2 | 4 | | | | | | | | | | |
| Q | L Noviski | 1 | 1 | | | J Silva | 6 | 6 | | | | | | | | | | |
| | J Silva | 6 | 6 | | | | | | | | J Silva | 3 | 6 | 6 | | | | |
| | A Bogomolov Jr. | 6 | 4 | 2 | | | | | | 5 | S Ventura | 6 | 3 | 2 | | | | |
| Q | C Berlocq | 3 | 6 | 6 | Q | C Berlocq | 6 | 2 | 6$^5$ | | | | | | | | | |
| | J Souza | 1 | 6 | 3 | 5 | S Ventura | 4 | 6 | 7 | | | | | | | | | |
| 5 | S Ventura | 6 | 3 | 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 | S Roitman | 6 | 6 | | | | | | | | | | | | | | |
| | B Kavčič | 3 | 3 | | 6 | S Roitman | 2 | 4 | | | | | | | | | |
| | N Lapentti | 7 | 6 | | | N Lapentti | 6 | 6 | | | | | | | | | |
| | E Schwank | 6$^2$ | 2 | | | | | | | N Lapentti | 2 | 6 | 4 | | | | |
| | M Alund | 4 | 2 | | | | | | 4 | JI Chela | 6 | 4 | 6 | | | | |
| | J-M Aranguren | 6 | 6 | | | J-M Aranguren | 0 | 2 | | | | | | | | | |
| Q | A Fabbri | 1 | 0 | | 4 | JI Chela | 6 | 6 | | | | | | | | | |
| 4 | JI Chela | 6 | 6 | | | | | | | | | | | 4 | JI Chela | 4 | 2 |
| 8 | L Recouderc | 6 | 2 | 2 | | | | | | | | | | | G Gaudio | 6 | 6 |
| | D Junqueira | 3 | 6 | 6 | | D Junqueira | 2 | 2 | | | | | | | | | |
| WC | M Zabaleta | 1 | 6$^3$ | | | G Gaudio | 6 | 6 | | | | | | | | | |
| | G Gaudio | 6 | 7 | | | | | | | G Gaudio | 3 | 6 | 6 | | | | |
| | D Marrero | 6 | 6 | | | | | | 2 | M González | 6 | 3 | 0 | | | | |
| WC | F Bagnis | 2 | 4 | | | D Marrero | 4 | 2 | | | | | | | | | |
| | JP Brzezicki | 7 | 6$^4$ | 1 | 2 | M González | 6 | 6 | | | | | | | | | |
| 2 | M González | 5 | 7 | 6 | | | | | | | | | | | | | |