The 2018 Challenger Banque Nationale de Granby was a professional tennis tournament played on outdoor hard courts. It was the twenty-fifth (ATP) and eighth (ITF) editions of the tournament and was part of the 2018 ATP Challenger Tour and the 2018 ITF Women's Circuit. It took place in Granby, Canada, on 23–29 July 2018.
Men's singles main draw entrants
Seeds
1 Rankings are as of 16 July 2018.
Other entrants
The following players received wildcards into the singles main draw: Alexis Galarneau Pavel Krainik Samuel Monette Benjamin Sigouin
The following players received entry from the qualifying draw: Joris De Loore Dayne Kelly Lucas Miedler Wishaya Trongcharoenchaikul
The following players received entry as lucky losers: Takanyi Garanganga Jacob Grills
Women's singles main draw entrants
Seeds
1 Rankings as of 16 July 2018.
Other entrants
The following players received a wildcard into the singles main draw: Isabelle Boulais Jada Bui Leylah Annie Fernandez Tiffany Lagarde
The following players received entry from the qualifying draw: Freya Christie Nagi Hanatani Samantha Murray Akiko Omae
Champions
Men's singles
Peter Polansky def. Ugo Humbert 6–4, 1–6, 6–2
Women's singles
Julia Glushko def. Arina Rodionova 6–4, 6–3
Men's doubles
Alex Lawson / Li Zhe def. JC Aragone / Liam Broady 7–6(7–2), 6–3.