2017 Challenger Banque Nationale de Granby – Men's singles

Frances Tiafoe was the defending champion but chose not to defend his title.

Blaž Kavčič won the title after defeating Peter Polansky 6–3, 2–6, 7–5 in the final.

Seeds
• # Blaž Kavčič (champion)

• # 🇨🇦 Peter Polansky (final)

• # 🇯🇵 Go Soeda (second round)

• # 🇨🇦 Denis Shapovalov (semifinals)

• # Jason Jung (first round)

• # 🇫🇷 Vincent Millot (first round)

• # 🇯🇵 Tatsuma Ito (quarterfinals)

• # 🇯🇵 Yasutaka Uchiyama (quarterfinals)