| Singles | |
|---|---|
| 2023 Aberto da República | |
| Champion |  Alejandro Tabilo |
| Runner-up |  Román Andrés Burruchaga |
| Score | 6–3, 7–6(8–6) |
Federico Coria was the defending champion [1] but chose not to defend his title.
Alejandro Tabilo won the title after defeating Román Andrés Burruchaga 6–3, 7–6(8–6) in the final.
Cristian Garín (quarterfinals) Tomás Barrios Vera (first round)
Hugo Dellien (withdrew)
Aleksandar Kovacevic (first round) Thiago Agustín Tirante (quarterfinals)
Thiago Monteiro (withdrew) Nicolas Moreno de Alboran (second round) Guido Andreozzi (first round) Oliver Crawford (first round)| Semifinals | Final | ||||||||||||
| Santiago Rodríguez Taverna | 4 | 3 | |||||||||||
| Román Andrés Burruchaga | 6 | 6 | |||||||||||
| Román Andrés Burruchaga | 3 | 66 | |||||||||||
| Q | Alejandro Tabilo | 6 | 78 | ||||||||||
| Q | Alejandro Tabilo | 6 | 3 | 6 | |||||||||
| Juan Pablo Ficovich | 4 | 6 | 2 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | C Garín | 6 | 6 | ||||||||||||||||||||||||
| Alt | O Luz | 0 | 4 | 1 | C Garín | 7 | 6 | ||||||||||||||||||||
| Q |  G Bueno | 62 | 67 | JL Reis da Silva | 5 | 4 | |||||||||||||||||||||
| JL Reis da Silva | 77 | 79 | 1 | C Garín | 4 | 5 | |||||||||||||||||||||
| S Rodríguez Taverna | 6 | 5 | 7 | S Rodríguez Taverna | 6 | 7 | |||||||||||||||||||||
| WC | E Ribeiro | 4 | 7 | 5 | S Rodríguez Taverna | 3 | 6 | 77 | |||||||||||||||||||
| M Pucinelli de Almeida | 3 | 3 | 7 | N Moreno de Alboran | 6 | 4 | 65 | ||||||||||||||||||||
| 7 | N Moreno de Alboran | 6 | 6 | S Rodríguez Taverna | 4 | 3 | |||||||||||||||||||||
| 4 | A Kovacevic | 3 | 6 | 62 | RA Burruchaga | 6 | 6 | ||||||||||||||||||||
| WC | J Fonseca | 6 | 3 | 77 | WC | J Fonseca | 6 | 4 | 4 | ||||||||||||||||||
| H Casanova | 6 | 5 | 1 | RA Burruchaga | 4 | 6 | 6 | ||||||||||||||||||||
| RA Burruchaga | 1 | 7 | 6 | RA Burruchaga | 77 | 6 | |||||||||||||||||||||
| Alt |  B Lock | 64 | 65 | T Boyer | 63 | 1 | |||||||||||||||||||||
| R Olivo | 77 | 77 | R Olivo | 1 | 4 | ||||||||||||||||||||||
| Tristan Boyer | 6 | 6 | T Boyer | 6 | 6 | ||||||||||||||||||||||
| 8 | G Andreozzi | 4 | 3 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| LL | M Alves | 7 | 6 | ||||||||||||||||||||||||
| Q | F Romboli | 5 | 3 | LL | M Alves | 4 | 4 | ||||||||||||||||||||
| Q | A Tabilo | 6 | 77 | Q | A Tabilo | 6 | 6 | ||||||||||||||||||||
| Q | I Buse | 4 | 65 | Q | A Tabilo | 6 | 64 | 711 | |||||||||||||||||||
 V Vacherot | 6 | 6 |  B Tomic | 4 | 77 | 69 | |||||||||||||||||||||
| LL |  B Bicknell | 1 | 1 | V Vacherot | 5 | 7 | 66 | ||||||||||||||||||||
| B Tomic | 6 | 6 | B Tomic | 7 | 5 | 78 | |||||||||||||||||||||
| 9 | Oliver Crawford | 3 | 2 | Q | A Tabilo | 6 | 3 | 6 | |||||||||||||||||||
| 5 | TA Tirante | 6 | 6 | JP Ficovich | 4 | 6 | 2 | ||||||||||||||||||||
| F Bagnis | 2 | 4 | 5 | TA Tirante | 6 | 6 | |||||||||||||||||||||
| Q | Wilson Leite | 64 | 5 | WC | G Klier Júnior | 4 | 4 | ||||||||||||||||||||
| WC | Gilbert Klier Júnior | 77 | 7 | 5 | TA Tirante | 6 | 3 | 61 | |||||||||||||||||||
| JP Ficovich | 6 | 6 | JP Ficovich | 4 | 6 | 77 | |||||||||||||||||||||
| Q | P Sakamoto | 1 | 2 | JP Ficovich | 77 | 6 | |||||||||||||||||||||
| G Heide | 79 | 6 | G Heide | 62 | 3 | ||||||||||||||||||||||
| 2 | T Barrios Vera | 67 | 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.
Guillermo Coria defeated Rainer Schüttler in the final, 6–2, 6–1, 6–3 to win the singles tennis title at the 2004 Monte Carlo Masters.
Roger Federer was the defending champion, but did not complete in the Juniors this year.
Guillermo Cañas was the defending champion, but did not participate.
Jo-Wilfried Tsonga was the defending champion, but due to injury did not defend his title.
Gerald Melzer was the defending champion but lost in the first round to Federico Coria.
Cristian Garín was the defending champion but chose not to defend his title.
Cristian Garín was the defending champion but chose not to defend his title.
Guido Andreozzi was the defending champion but chose not to defend his title.
This was the first edition of the tournament.
This was the first edition of the tournament, primarily organised due to the cancellation of many tournaments in 2020, due to the COVID-19 pandemic.
Thiago Seyboth Wild was the defending champion but chose not to defend his title.
Thiago Monteiro was the defending champion but chose not to defend his title.
This was the first edition of the tournament.
Cristian Garín defeated Facundo Bagnis in the final, 6–4, 6–7(3–7), 7–5 to capture the men's singles tennis title at the 2021 Chile Open.
Stefanos Tsitsipas defeated Andrey Rublev in the final, 6–3, 6–3 to win the singles tennis title at the 2021 Monte-Carlo Masters. It was his first ATP Tour Masters 1000 title, making him the first Greek to win a Masters tournament. Rublev was also in contention for his maiden Masters 1000 title.
Jaume Munar was the defending champion but lost in the semifinals to Juan Ignacio Londero.
Francisco Cerúndolo was the defending champion but lost in the semifinals to Sebastián Báez.
This was the first edition of the tournament.
Stefano Travaglia was the defending champion but chose not to defend his title.