2005 ATP Buenos Aires – Singles
| Singles | |
|---|---|
| 2005 ATP Buenos Aires | |
| Champion |
 Gastón Gaudio
|
| Runner-up |
Mariano Puerta
|
| Final score | 6–4, 6–4 |
Gastón Gaudio defeated Mariano Puerta 6–4, 6–4 to win the 2005 ATP Buenos Aires singles competition. Guillermo Coria was the champion but did not defend his title.
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