See main article: 2007 ATP Buenos Aires.
Carlos Moyá was the defending champion, but was eliminated in the round robin competition.
Juan Mónaco won the title, defeating Alessio di Mauro 6–1, 6–2 in the final.
See also: 1. 
David Nalbandian (round robin)
See also: 2. 
Juan Carlos Ferrero (round robin)
See also: 3. Agustín Calleri (round robin, withdrew due to a back fibrosis)[1]
See also: 4. Nicolás Almagro (semifinals)
See also: 5. Carlos Moyá (round robin)
See also: 6. Gastón Gaudio (round robin, withdrew because of personal reasons)
See also: 7. Juan Ignacio Chela (quarterfinals)
See also: 8. José Acasuso (round robin, retired due to a right elbow injury)
Due to Gaudio's withdrawal from the tournament, di Mauro advanced to Quarterfinals based on head-to-head results against Ramírez Hidalgo.
Due to Lapentti's withdrawal from the tournament, Devilder advanced to Quarterfinals based on head-to-head results against Ferrero.
Prior to the round robin and after the completion of the qualifying draws, the 16 players with the lowest tier in the tournament (4 qualifiers, 3 wild cards, 1 lucky loser, 2 special exempts and 6 based on ATP rankings) competed in the elimination round in order to get one of the 8 last spots into the round robin competition. Winners in this round entered as main entrants.
| Main draw elimination round | ||||
|---|---|---|---|---|
| Event | Winner | Loser | Score | |
| Main Entrant 1 |  Stefano Galvani [LL] | Diego Junqueira [Q] | 6–4, 4–6, 7–5 | |
| Main Entrant 2 | Potito Starace | Mariano Zabaleta [WC] | 7–6(11–9), 6–2 | |
| Main Entrant 3 | Alessio di Mauro | Carlos Berlocq [Q] RR-LL | 6–1, 6–3 | |
| Main Entrant 4 |  Igor Andreev |  Jiří Vaněk RR-LL | 6–4, 6–4 | |
| Main Entrant 5 |  Nicolas Devilder | Juan Pablo Brzezicki [Q] | 6–3, 5–7, 6–3 | |
| Main Entrant 6 | Guillermo Cañas [SE] | Juan Pablo Guzmán [WC] | 7–6(7–4), 6–3 | |
| Main Entrant 7 | Diego Hartfield [WC] | Denis Gremelmayr [Q] | 7–6(7–5), 6–1 | |
| Main Entrant 8 |  Flávio Saretta [SE] | Lukáš Dlouhý RR-LL | 6–3, 6–1 | |
See also: 1. Óscar Hernández (first round, retired)
See also: 2. Olivier Patience (first round)
See also: 3. Stefano Galvani (qualifying competition, lucky loser)
See also: 4. Carlos Berlocq (qualified)
See also: 5. Gorka Fraile (qualifying competition)
See also: 6. 
Boris Pašanski (first round)
See also: 7. Denis Gremelmayr (qualified)
See also: 8. Paolo Lorenzi (first round)