2025 Rio Open – Singles
| Singles | |
|---|---|
| 2025 Rio Open | |
| Champion | Sebastián Báez |
| Runner-up | Alexandre Müller |
| Score | 6–2, 6–3 |
| Draw | 32 (4 Q / 3 WC ) |
| Seeds | 8 |
Defending champion Sebastián Báez defeated Alexandre Müller in the final, 6–2, 6–3 to win the singles tennis title at the 2025 Rio Open. It was his seventh ATP Tour title. Báez was the first player to successfully defend the title and first to win multiple titles since the tournament's inception in 2014.
The quarterfinal match between Camilo Ugo Carabelli and Jaime Faria marked the second all-lucky loser quarterfinal in ATP Tour history (since 1990), after Max Purcell and Andreas Seppi at the 2021 Eastbourne International.