2018 Estoril Open – Singles

Pablo Carreño Busta was the defending champion, but lost in the semifinals to Frances Tiafoe.

João Sousa won the title, defeating Tiafoe in the final, 6–4, 6–4.

Seeds
The top four seeds received a bye into the second round. • # Kevin Anderson (second round)

• #🇪🇸 Pablo Carreño Busta (semifinals)

• #🇬🇧 Kyle Edmund (quarterfinals)

• #🇱🇺 Gilles Müller (second round)

• #🇪🇸 Albert Ramos Viñolas (first round)

• # Robin Haase (first round)

• #🇦🇷 Leonardo Mayer (first round)

• #🇷🇺 Daniil Medvedev (first round)

Seeds
• # 🇺🇸 Tim Smyczek (qualified)

• # 🇫🇷 Corentin Moutet (qualifying competition)

• # 🇰🇿 Alexander Bublik (first round)

• # 🇮🇹 Simone Bolelli (qualified)

• # 🇮🇹 Alessandro Giannessi (first round)

• # 🇫🇷 Stéphane Robert (first round)

• # 🇪🇸 Jaume Munar (qualifying competition)

• # 🇫🇷 Kenny de Schepper (first round)

Qualifiers
• # 🇺🇸 Tim Smyczek

• # João Domingues

• # 🇪🇸 Ricardo Ojeda Lara

• # 🇮🇹 Simone Bolelli