2018 Challenger Banque Nationale de Granby – Men's singles

Blaž Kavčič was the defending champion but chose not to defend his title.

Peter Polansky won the title after defeating Ugo Humbert 6–4, 1–6, 6–2 in the final.

Seeds
• # 🇫🇷 Pierre-Hugues Herbert (second round)

• # 🇦🇺 Jason Kubler (withdrew)

• # 🇨🇦 Peter Polansky (champion)

• # 🇩🇪 Matthias Bachinger (first round)

• # 🇬🇧 Liam Broady (first round)

• # 🇸🇰 Norbert Gombos (semifinals)

• # 🇨🇦 Filip Peliwo (second round)

• # 🇺🇸 Mitchell Krueger (first round)