2018 Tiburon Challenger – Singles

Cameron Norrie was the defending champion but chose not to defend his title.

Michael Mmoh won the title after defeating Marcel Granollers 6–3, 7–5 in the final.

Seeds
• # 🇪🇸 Marcel Granollers (final)

• # 🇦🇺 Jordan Thompson (first round)

• # 🇨🇦 Peter Polansky (second round)

• # Henri Laaksonen (first round)

• # 🇺🇸 Michael Mmoh (champion)

• # 🇺🇸 Noah Rubin (semifinals)

• # 🇦🇺 Marc Polmans (first round)

• # 🇺🇸 Bjorn Fratangelo (second round)