2015 Rio Open – Men's singles

Rafael Nadal was the defending champion, but lost in the semifinals to Fabio Fognini.

David Ferrer won the title, defeating Fognini in the final, 6–2, 6–3.

Seeds
• 🇪🇸 Rafael Nadal (semifinals)

• 🇪🇸 David Ferrer (champion)

• 🇪🇸 Tommy Robredo (second round)

• 🇮🇹 Fabio Fognini (final)

• 🇦🇷 Leonardo Mayer (first round, retired)

• Pablo Cuevas (quarterfinals)

• 🇨🇴 Santiago Giraldo (first round, retired)

• 🇸🇰 Martin Kližan (second round)

Seeds
• 🇪🇸 Daniel Gimeno-Traver (qualified)

• 🇦🇷 Facundo Bagnis (first round)

• Thiemo de Bakker (qualified)

• 🇦🇷 Facundo Argüello (qualified)

• 🇷🇴 Adrian Ungur (qualifying competition)

• 🇮🇹 Marco Cecchinato (qualified)

• 🇧🇷 André Ghem (first round)

• 🇦🇷 Guido Pella (first round)

Qualifiers
• # 🇪🇸 Daniel Gimeno-Traver

• # 🇮🇹 Marco Cecchinato

• # Thiemo de Bakker

• # 🇦🇷 Facundo Argüello