# 2025 Argentina Open – Singles

João Fonseca defeated Francisco Cerúndolo in the final, 6–4, 7–6$^{(7–1)}$ to win the singles tennis title at the 2025 Argentina Open. He saved two match points (in the quarterfinals against Mariano Navone) en route to his first ATP Tour title. Fonseca was the youngest Brazilian man and the second-youngest South American in the Open Era, behind only Guillermo Pérez Roldán in 1987, and the first man born in 2006, to win a top-level title. He entered the tournament through the Next Gen Accelerator Program introduced by the ATP in 2024, being the first player entered under the system to win a tour-level title. Fonseca was the first Brazilian man to win the Argentina Open title since Gustavo Kuerten in 2001, and the lowest-ranked champion (world No. 99) in tournament history.
Facundo Díaz Acosta was the defending champion, but lost in the first round to Thiago Seyboth Wild.
This tournament marked the final professional appearance of former world No. 8 Diego Schwartzman. He defeated seventh seed Nicolás Jarry in the first round, before losing in the second round to Pedro Martínez.

## Seeds

The top four seeds received a bye into the second round.
* Alexander Zverev (quarterfinals)
* Holger Rune (second round)
* Lorenzo Musetti (quarterfinals, withdrew)
* Alejandro Tabilo (second round)
* Francisco Cerúndolo (final)
* Sebastián Báez (second round)
* Nicolás Jarry (first round)
* Tomás Martín Etcheverry (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 | Semifinals | Final | Final | Final | Final |
| 5 | Francisco Cerúndolo | 6 | 6 | | | | | |
| | Pedro Martínez | 2 | 4 | | | | | |
| | Pedro Martínez | 2 | 4 | | 5 | Francisco Cerúndolo | 4 | 6$^1$ |
| | | | | | | João Fonseca | 6 | 7$^7$ |
| Q | Laslo Djere | 6$^3$ | 7 | 1 | | João Fonseca | 6 | 7$^7$ |
| | João Fonseca | 7$^7$ | 5 | 6 | | | | |

### Top 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 |
| | | | | | 1 | A Zverev | 6 | 6 | | | | | | | | | |
| | R Carballés Baena | 6$^8$ | 5 | | | D Lajović | 4 | 4 | | | | | | | | | |
| | D Lajović | 7$^{10}$ | 7 | | | | | | 1 | A Zverev | 6 | 3 | 2 | | | | |
| Q | RA Burruchaga | 6$^4$ | 7 | 5 | | | | | 5 | F Cerúndolo | 3 | 6 | 6 | | | | |
| Q | JM Cerúndolo | 7$^7$ | 5 | 7 | Q | JM Cerúndolo | 2 | 3 | | | | | | | | | |
| | L Darderi | 4 | 4 | | 5 | F Cerúndolo | 6 | 6 | | | | | | | | | |
| 5 | F Cerúndolo | 6 | 6 | | | | | | | | | | | 5 | F Cerúndolo | 6 | 6 |
| | | | | | | | | | | | | | | | P Martínez | 2 | 4 |
| | | | | | 3 | L Musetti | 6 | 6 | | | | | | | | | |
| | C Moutet | 7 | 6 | | | C Moutet | 2 | 3 | | | | | | | | | |
| LL | S Nagal | 5 | 2 | | | | | | 3 | L Musetti | | | | | | | |
| | D Džumhur | 6 | 2 | 6$^3$ | | | | | | P Martínez | w/o | | | | | | |
| | P Martínez | 0 | 6 | 7$^7$ | | P Martínez | 6 | 6 | | | | | | | | | |
| WC | D Schwartzman | 7$^{12}$ | 4 | 6 | WC | D Schwartzman | 2 | 2 | | | | | | | | | |
| 7 | N Jarry | 6$^{10}$ | 6 | 3 | | | | | | | | | | | | | |

### 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 | Semifinals |
| 6 | S Báez | 6 | 6 | | | | | | | | | | | | | | | | |
| WC | C Ugo Carabelli | 4 | 4 | | 6 | S Báez | 3 | 4 | | | | | | | | | | | |
| | F Díaz Acosta | 6 | 2 | 3 | | T Seyboth Wild | 6 | 6 | | | | | | | | | | | |
| | T Seyboth Wild | 3 | 6 | 6 | | | | | | | T Seyboth Wild | 6$^3$ | 3 | | | | | | |
| | A Müller | 3 | 3 | | | | | | | Q | L Djere | 7$^7$ | 6 | | | | | | |
| Q | L Djere | 6 | 6 | | Q | L Djere | 2 | 6 | 7$^7$ | | | | | | | | | | |
| | | | | | 4 | A Tabilo | 6 | 1 | 6$^2$ | | | | | | | | | | |
| | | | | | | | | | | | | | | | Q | L Djere | 6$^3$ | 7 | 1 |
| 8 | TM Etcheverry | 3 | 3 | | | | | | | | | | | | | J Fonseca | 7$^7$ | 5 | 6 |
| | J Fonseca | 6 | 6 | | | J Fonseca | 2 | 6 | 6 | | | | | | | | | | |
| | H Gaston | 3 | 2 | | LL | F Coria | 6 | 4 | 2 | | | | | | | | | | |
| LL | F Coria | 6 | 6 | | | | | | | | J Fonseca | 3 | 6 | 7 | | | | | |
| | M Navone | 6 | 6 | | | | | | | | M Navone | 6 | 4 | 5 | | | | | |
| WC | F Comesaña | 4 | 4 | | | M Navone | 6 | 7$^7$ | | | | | | | | | | | |
| | | | | | 2 | H Rune | 1 | 6$^2$ | | | | | | | | | | | |

## Qualifying
### Seeds

* Francesco Passaro (qualified, withdrew)
* Thiago Monteiro (first round)
* Federico Coria (qualifying competition, lucky loser)
* Sumit Nagal (qualifying competition, retired, lucky loser)
* Jaime Faria (first round)
* Laslo Djere (qualified)
* Hugo Dellien (withdrew, still playing in Rosario)
* Tseng Chun-hsin (first round)

### Qualifiers

* Francesco Passaro (withdrew)
* Román Andrés Burruchaga
* Laslo Djere
* Juan Manuel Cerúndolo

### Lucky losers

* Federico Coria
* Sumit Nagal

### Qualifying draw
#### First qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 1 | Francesco Passaro | 6 | 6 | | | | | | |
| | Daniel Elahi Galán | 1 | 4 | | | | | | |
| | Daniel Elahi Galán | 1 | 4 | | 1 | Francesco Passaro | 2 | 7$^8$ | 6 |
| | | | | | WC | Juan Bautista Torres | 6 | 6$^6$ | 1 |
| WC | Juan Bautista Torres | 6 | 3 | 7 | WC | Juan Bautista Torres | 6 | 6$^6$ | 1 |
| 8 | Tseng Chun-hsin | 1 | 6 | 5 | | | | | |

#### Second qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 2 | Thiago Monteiro | 7 | 3 | 6$^8$ | | | | | |
| Alt | Felipe Meligeni Alves | 5 | 6 | 7$^{10}$ | | | | | |
| Alt | Felipe Meligeni Alves | 5 | 6 | 7$^{10}$ | Alt | Felipe Meligeni Alves | 6 | 2 | 6$^3$ |
| | | | | | Alt | Román Andrés Burruchaga | 2 | 6 | 7$^7$ |
| Alt | Román Andrés Burruchaga | 6 | 6 | | Alt | Román Andrés Burruchaga | 2 | 6 | 7$^7$ |
| Alt | Gustavo Heide | 3 | 4 | | | | | | |

#### Third qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 3 | Federico Coria | 5 | 7$^{10}$ | 4 | | | | |
| | Thiago Agustín Tirante | 7 | 6$^8$ | 1$^r$ | | | | |
| | Thiago Agustín Tirante | 7 | 6$^8$ | 1$^r$ | 3 | Federico Coria | 2 | 4 |
| | | | | | 6 | Laslo Djere | 6 | 6 |
| Alt | Marco Trungelliti | 4 | 4 | | 6 | Laslo Djere | 6 | 6 |
| 6 | Laslo Djere | 6 | 6 | | | | | |

#### Fourth qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 4 | Sumit Nagal | 6$^4$ | 6 | 7$^7$ | | | | | |
| WC | Juan Pablo Ficovich | 7$^7$ | 2 | 6$^4$ | | | | | |
| WC | Juan Pablo Ficovich | 7$^7$ | 2 | 6$^4$ | 4 | Sumit Nagal | 6 | 6$^5$ | 0$^r$ |
| | | | | | | Juan Manuel Cerúndolo | 3 | 7$^7$ | 1 |
| | Juan Manuel Cerúndolo | 6 | 7$^7$ | | | Juan Manuel Cerúndolo | 3 | 7$^7$ | 1 |
| 5 | Jaime Faria | 1 | 6$^1$ | | | | | | |