2018 Stockton Challenger – Men's singles

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

Lloyd Harris won the title after defeating Marc Polmans 6–2, 6–2 in the final.

Seeds
• # 🇦🇺 Jordan Thompson (semifinals)

• # 🇺🇸 Reilly Opelka (first round)

• # Henri Laaksonen (first round)

• # Lloyd Harris (champion)

• # 🇳🇴 Casper Ruud (second round)

• # 🇺🇸 Noah Rubin (quarterfinals)

• # 🇦🇺 Alex Bolt (second round)

• # 🇦🇺 Marc Polmans (final)