2018 Brasil Open – Singles

Pablo Cuevas was the three-time defending champion, but lost in the semifinals to Fabio Fognini.

Fognini went on to win the title, defeating Nicolás Jarry in the final, 1–6, 6–1, 6–4.

Seeds
The top four seeds receive a bye into the second round. • #🇪🇸 Albert Ramos Viñolas (quarterfinals)

• #🇮🇹 Fabio Fognini (champion)

• # Pablo Cuevas (semifinals)

• #🇫🇷 Gaël Monfils (second round)

• #🇦🇷 Leonardo Mayer (quarterfinals)

• #🇦🇷 Guido Pella (second round)

• #🇺🇸 Tennys Sandgren (first round)

• #🇦🇷 Federico Delbonis (second round)

Seeds
• # 🇦🇹 Sebastian Ofner (qualified)

• # 🇪🇸 Tommy Robredo (first round)

• # 🇦🇷 Renzo Olivo (qualified)

• # João Domingues (qualified)

• # 🇧🇷 Guilherme Clezar (qualified)

• # 🇧🇷 João Souza (first round, retired)

• # 🇪🇸 Daniel Muñoz de la Nava (first round, retired)

• # 🇪🇨 Roberto Quiroz (qualifying competition)

Qualifiers
• # 🇦🇹 Sebastian Ofner

• # 🇧🇷 Guilherme Clezar

• # 🇦🇷 Renzo Olivo

• # João Domingues