| Men's doubles | |
|---|---|
| 2018 Challenger Banque Nationale de Granby | |
| Champions |  Alex Lawson  Li Zhe |
| Runners-up | JC Aragone  Liam Broady |
| Score | 7–6(7–2), 6–3 |
Joe Salisbury and Jackson Withrow were the defending champions but chose not to defend their title.
Alex Lawson and Li Zhe won the title after defeating JC Aragone and Liam Broady 7–6(7–2), 6–3 in the final.
Matt Reid / 
Yasutaka Uchiyama (semifinals) Bradley Mousley / 
Maximilian Neuchrist (first round) Alex Lawson / Li Zhe (champions) JC Aragone / Liam Broady (final)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | M Reid Y Uchiyama | 6 | 3 | [10] | |||||||||||||||||||||||
 F Dancevic P Polansky | 6 | 63 | [10] | F Dancevic P Polansky | 3 | 6 | [7] | ||||||||||||||||||||
| WC | Taha Baadi Justin Boulais | 3 | 77 | [6] | 1 | M Reid Y Uchiyama | 3 | 6 | [4] | ||||||||||||||||||
| 4 | JC Aragone L Broady | 4 | 6 | [11] | 4 | JC Aragone L Broady | 6 | 3 | [10] | ||||||||||||||||||
| Shintaro Imai K Uchida | 6 | 4 | [9] | 4 | JC Aragone L Broady | w/o | |||||||||||||||||||||
| A Galarneau B Sigouin | w/o | A Galarneau B Sigouin | |||||||||||||||||||||||||
| T Fawcett Tyler Lu | 4 | JC Aragone L Broady | 62 | 3 | |||||||||||||||||||||||
L Johnson  J Menezes | 6 | 3 | [10] | 3 | A Lawson Z Li | 77 | 6 | ||||||||||||||||||||
| WC | JM Lin Nicaise Muamba | 4 | 6 | [7] | L Johnson J Menezes | 79 | 1 | [9] | |||||||||||||||||||
| WC | Washi Gervais K Stevenson | 4 | 3 | 3 | A Lawson Z Li | 67 | 6 | [11] | |||||||||||||||||||
| 3 | A Lawson Z Li | 6 | 6 | 3 | A Lawson Z Li | 6 | 4 | [10] | |||||||||||||||||||
| Pavel Krainik Samuel Monette | 4 | 65 |  J De Loore  N Gombos | 2 | 6 | [6] | |||||||||||||||||||||
| J De Loore N Gombos | 6 | 77 | J De Loore N Gombos | 6 | 79 | ||||||||||||||||||||||
| J Frawley Jacob Grills | 6 | 6 | J Frawley J Grills | 1 | 67 | ||||||||||||||||||||||
| 2 | B Mousley M Neuchrist | 2 | 3 | ||||||||||||||||||||||||
Liam Broady and Tom Farquharson were the defending champions but Farquharson was no longer eligible to compete as a Junior. Broady competed with Filip Horanský and lost in the semifinals to George Morgan and Mate Pavić.
Oliver Golding was the defending champion, but was no longer eligible to compete.
David O'Hare and Joe Salisbury were the defending champions but lost in the quarterfinals to Dominik Köpfer and Alex Lawson.
John Isner was the defending champion, but withdrew before the tournament began.
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.
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Alex Lawson and Li Zhe were the defending champions but only Li chose to defend his title, partnering Hugo Nys. Li lost in the final to André Göransson and Sem Verbeek.
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Mitchell Krueger and Jack Sock were the defending champions but chose not to defend their title.
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