2019 Challenger Banque Nationale de Granby – Men's singles

Peter Polansky was the defending champion but lost in the semifinals to Yasutaka Uchiyama.

Ernesto Escobedo won the title after defeating Uchiyama 7–6(7–5), 6–4 in the final.

Seeds
All seeds receive a bye into the second round. • # 🇸🇰 Norbert Gombos (third round)

• # 🇨🇦 Peter Polansky (semifinals)

• # 🇯🇵 Yasutaka Uchiyama (final)

• # 🇨🇦 Vasek Pospisil (third round)

• # 🇫🇷 Maxime Janvier (second round)

• # 🇫🇷 Enzo Couacaud (quarterfinals)

• # 🇦🇺 Andrew Harris (third round)

• # 🇦🇺 Jason Kubler (withdrew)

• # 🇨🇦 Steven Diez (quarterfinals)

• # 🇨🇳 Li Zhe (quarterfinals)

• # 🇯🇵 Yosuke Watanuki (second round)

• # 🇦🇺 Akira Santillan (second round)

• # 🇯🇵 Hiroki Moriya (quarterfinals)

• # 🇯🇵 Kaichi Uchida (second round)

• # 🇦🇺 Maverick Banes (second round)

• # 🇷🇸 Danilo Petrović (third round)