2018 Challenger Banque Nationale de Granby – Women's singles

Cristiana Ferrando was the defending champion, but lost in the first round to Maria Sanchez.

Julia Glushko won the title after defeating Arina Rodionova 6–4, 6–3 in the final.

Seeds
• # 🇦🇺 Arina Rodionova (final)

• # 🇨🇿 Marie Bouzková (second round)

• # 🇨🇦 Bianca Andreescu (semifinals, withdrew)

• # 🇺🇸 Francesca Di Lorenzo (second round)

• # 🇮🇱 Julia Glushko (champion)

• # 🇦🇺 Ellen Perez (quarterfinals)

• # 🇺🇸 Maria Sanchez (second round)

• # 🇨🇦 Katherine Sebov (semifinals)