2018 Argentina Open – Singles

Alexandr Dolgopolov was the defending champion, but withdrew before the tournament began.

Dominic Thiem won the title, defeating Aljaž Bedene in the final, 6–2, 6–4.

Seeds
The top four seeds receive a bye into the second round. • #🇦🇹 Dominic Thiem (champion)

• #🇪🇸 Pablo Carreño Busta (second round)

• #🇪🇸 Albert Ramos Viñolas (second round)

• #🇮🇹 Fabio Fognini (second round)

• #🇦🇷 Diego Schwartzman (quarterfinals)

• #🇬🇧 Kyle Edmund (withdrew)

• # Pablo Cuevas (first round)

• #🇪🇸 Fernando Verdasco (second round)

Seeds
• # 🇺🇸 Tennys Sandgren (first round)

• # 🇮🇹 Marco Cecchinato (qualified)

• # 🇧🇷 Rogério Dutra Silva (qualified)

• # 🇧🇷 Thomaz Bellucci (qualified)

• # Gastão Elias (qualifying competition, lucky loser)

• # 🇳🇴 Casper Ruud (qualifying competition)

• # 🇦🇷 Renzo Olivo (first round)

• # 🇮🇹 Alessandro Giannessi (first round)

Qualifiers
• # 🇦🇷 Facundo Bagnis

• # 🇮🇹 Marco Cecchinato

• # 🇧🇷 Rogério Dutra Silva

• # 🇧🇷 Thomaz Bellucci

Lucky losers

 * 1)  Gastão Elias