2018 Challenger Banque Nationale de Granby

The 2018 Challenger Banque Nationale de Granby was a professional tennis tournament played on outdoor hard courts. It was the twenty-fifth and eighth 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

¹ Rankings are as of 16 July 2018.

The following players received wildcards into the singles main draw:

The following players received entry from the qualifying draw:

The following players received entry as lucky losers:

¹ Rankings as of 16 July 2018.

The following players received a wildcard into the singles main draw:

The following players received entry from the qualifying draw:

Peter Polansky def. Ugo Humbert 6–4, 1–6, 6–2

Julia Glushko def. Arina Rodionova 6–4, 6–3

Alex Lawson / Li Zhe def. JC Aragone / Liam Broady 7–6, 6–3.

Ellen Perez / Arina Rodionova def. Erika Sema / Aiko Yoshitomi, 7–5, 6–4