| Men's doubles | |
|---|---|
| 2018 Challenger Banque Nationale de Gatineau | |
| Champions |  Robert Galloway Bradley Klahn |
| Runners-up |  Darian King  Peter Polansky |
| Score | 7–6(7–4), 4–6, [10–8] |
Bradley Klahn and Jackson Withrow were the defending champions but only Klahn chose to defend his title, partnering Robert Galloway. Klahn successfully defended his title.
Klahn and Galloway won the title after defeating Darian King and Peter Polansky 7–6(7–4), 4–6, [10–8] in the final.
Bradley Mousley / Matt Reid (semifinals) Robert Galloway / Bradley Klahn (champions)
Lucas Miedler / Maximilian Neuchrist (first round) Darian King / Peter Polansky (final)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | B Mousley M Reid | 6 | 6 | ||||||||||||||||||||||||
 S Napolitano B Schnur | 4 | 4 | 1 | B Mousley M Reid | 6 | 62 | [10] | ||||||||||||||||||||
| H Johnson Y Johnson | 6 | 3 | [11] | H Johnson Y Johnson | 3 | 77 | [3] | ||||||||||||||||||||
 A Escoffier U Humbert | 4 | 6 | [9] | 1 | B Mousley M Reid | 4 | 2 | ||||||||||||||||||||
| 4 | D King P Polansky | 713 | 7 | 4 | D King P Polansky | 6 | 6 | ||||||||||||||||||||
 L Broady  J De Loore | 611 | 5 | 4 | D King P Polansky | 4 | 77 | [10] | ||||||||||||||||||||
 Shintaro Imai K Uchida | 6 | 77 | S Imai K Uchida | 6 | 64 | [3] | |||||||||||||||||||||
| Y Takahashi Renta Tokuda | 4 | 63 | 4 | D King P Polansky | 64 | 6 | [8] | ||||||||||||||||||||
 L Grigelis  E Leshem | 6 | 6 | 2 | R Galloway B Klahn | 77 | 4 | [10] | ||||||||||||||||||||
| WC | Justin Boulais Pavel Krainik | 2 | 4 | L Grigelis E Leshem | 64 | 710 | [13] | ||||||||||||||||||||
| M Krueger A Lawson | 710 | 77 | M Krueger A Lawson | 77 | 68 | [11] | |||||||||||||||||||||
| 3 | L Miedler M Neuchrist | 68 | 64 | L Grigelis E Leshem | 4 | 5 | |||||||||||||||||||||
| WC | A Galarneau B Sigouin | 6 | 6 | 2 | R Galloway B Klahn | 6 | 7 | ||||||||||||||||||||
 Z Li F Peliwo | 1 | 3 | WC | A Galarneau B Sigouin | 5 | 5 | |||||||||||||||||||||
| WC | JM Lin Nicaise Muamba | 3 | 3 | 2 | R Galloway B Klahn | 7 | 7 | ||||||||||||||||||||
| 2 | R Galloway B Klahn | 6 | 6 | ||||||||||||||||||||||||
Juan Mónaco was the defending champion, but lost to John Isner in the semifinals.
Isner went on to win the title, defeating Nicolás Almagro in the final, 6–3, 7–5.
Austin Krajicek and John Peers were the defending champions, but Peers chose not to compete.
Krajicek paired with Mitchell Krueger but lost in the semifinals to eventual finalists Bradley Klahn and Michael Venus.
Frank Dancevic and Peter Polansky won the title 7–5, 6–3.
Jack Sock was the defending champion but decided to participate at the 2013 Shanghai Rolex Masters instead.
Peter Polansky won the title over 3rd seed Matthew Ebden 7–5, 6–3 to win his first Challenger title.
Bobby Reynolds and John-Patrick Smith were the defending champions, but Reynolds chose not to participate. Smith partnered with Adam Hubble and lost in the quarterfinals to Alex Kuznetsov and Nils Langer.
Peter Polansky was the defending champion, but withdrew because of an elbow injury.
Hsieh Cheng-peng and Yi Chu-huan were the defending champions, but chose to defend their title with different partners. Hsieh partnered Zhang Ze but lost in the first round to Wu Yibing and Wu Di. Yi partnered Toshihide Matsui and successfully defended his title.
Malek Jaziri was the defending champion but chose not to defend his title.
Steve Johnson was the defending champion and successfully defended his title, defeating Tennys Sandgren in the final, 7–6(7–2), 2–6, 6–4.
Purav Raja and Divij Sharan were the defending champions but only Raja chose to defend his title, partnering Fabrice Martin. Raja lost in the quarterfinals to Guillermo Durán and Máximo González.
The 2018 Challenger Banque Nationale de Gatineau was a professional tennis tournament played on outdoor hard courts. It was the 3rd edition of the tournament for men and the 5th for women, and it was part of the 2018 ATP Challenger Tour and the 2018 ITF Women's Circuit. It took place in Gatineau, Canada between July 16 and 22, 2018.
Denis Shapovalov was the defending champion but chose not to defend his title.
Cameron Norrie was the defending champion but chose not to defend his title.
Filip Peliwo was the defending champion but chose not to defend his title.
Taylor Fritz was the defending champion and successfully defended his title after defeating Brayden Schnur 7–6(9–7), 6–4 in the final.
David Ferrer was the defending champion but chose not to defend his title.
Marc-Andrea Hüsler and Sem Verbeek were the defending champions but chose not to defend their title.
Bradley Klahn was the defending champion but chose not to defend his title.
This was the first edition of the tournament.
Sanchai Ratiwatana and Christopher Rungkat were the defending champions but chose not to defend their title.
Reilly Opelka was the defending champion but chose not to defend his title.