2018 Fairfield Challenger – Singles

Mackenzie McDonald was the defending champion but chose not to defend his title.

Bjorn Fratangelo won the title after defeating Alex Bolt 6–4, 6–3 in the final.

Seeds
• # 🇦🇺 Jordan Thompson (quarterfinals)

• # Lloyd Harris (quarterfinals)

• # 🇺🇸 Noah Rubin (second round)

• # 🇺🇸 Reilly Opelka (first round)

• # 🇪🇸 Adrián Menéndez Maceiras (semifinals, retired)

• # 🇳🇴 Casper Ruud (semifinals)

• # Ivo Karlović (first round)

• # 🇦🇺 Alex Bolt (final)