2018 Los Cabos Open – Singles

Sam Querrey was the defending champion, but lost in the second round to Egor Gerasimov.

Fabio Fognini won the title, defeating Juan Martín del Potro in the final, 6–4, 6–2.

Seeds
The top four seeds received a bye into the second round. • #🇦🇷 Juan Martín del Potro (final)

• #🇮🇹 Fabio Fognini (champion)

• #🇧🇦 Damir Džumhur (semifinals)

• #🇫🇷 Adrian Mannarino (quarterfinals)

• #🇺🇸 Sam Querrey (second round)

• #🇺🇸 Ryan Harrison (withdrew)

• #🇺🇸 Taylor Fritz (second round)

• #🇪🇸 Feliciano López (second round)

Seeds
• # 🇨🇴 Daniel Elahi Galán (qualifying competition, lucky loser)

• # 🇪🇬 Mohamed Safwat (qualified)

• # 🇮🇳 Prajnesh Gunneswaran (qualified)

• # 🇺🇸 Evan King (first round)

• # 🇦🇺 Bradley Mousley (first round)

• # 🇺🇸 Evan Song (qualifying competition)

• # 🇦🇺 Aleksandar Vukic (qualifying competition)

• # 🇺🇸 Austin Krajicek (first round)

Qualifiers
• # 🇺🇸 Marcos Giron

• # 🇪🇬 Mohamed Safwat

• # 🇮🇳 Prajnesh Gunneswaran

• # Takanyi Garanganga

Lucky loser

 * 1) 🇨🇴 Daniel Elahi Galán