2019 Rio Open – Singles

Laslo Đere won the title – the first of his career – defeating Félix Auger-Aliassime in the final, 6–3, 7–5. No seeded players reached the quarterfinals, and only one seed (João Sousa) won his first-round match.

Diego Schwartzman was the defending champion, but he retired in the first round against Pablo Cuevas.

Seeds
• #🇦🇹 Dominic Thiem (first round)

• #🇮🇹 Fabio Fognini (first round)

• #🇮🇹 Marco Cecchinato (first round)

• #🇦🇷 Diego Schwartzman (first round, retired)

• # João Sousa (second round)

• #🇷🇸 Dušan Lajović (first round)

• #🇹🇳 Malek Jaziri (first round)

• # Nicolás Jarry (first round)

Seeds
• # 🇦🇷 Juan Ignacio Londero (qualified)

• # 🇮🇹 Lorenzo Sonego (moved to main draw)

• # 🇧🇴 Hugo Dellien (qualified)

• # 🇸🇪 Elias Ymer (qualified)

• # 🇳🇴 Casper Ruud (qualified)

• # 🇦🇷 Carlos Berlocq (qualifying competition, lucky loser)

• # 🇧🇷 Rogério Dutra Silva (qualifying competition)

• # 🇪🇸 Pedro Martínez (qualifying competition)

Qualifiers
• # 🇦🇷 Juan Ignacio Londero

• # 🇳🇴 Casper Ruud

• # 🇧🇴 Hugo Dellien

• # 🇸🇪 Elias Ymer

Lucky loser

 * 1) 🇦🇷 Carlos Berlocq