# 2018 Challenger Banque Nationale de Granby – Men's singles

Blaž Kavčič was the defending champion but chose not to defend his title.
Peter Polansky won the title after defeating Ugo Humbert 6–4, 1–6, 6–2 in the final.

## Seeds

* Pierre-Hugues Herbert (second round)
* Jason Kubler (withdrew)
* Peter Polansky (champion)
* Matthias Bachinger (first round)
* Liam Broady (first round)
* Norbert Gombos (semifinals)
* Filip Peliwo (second round)
* Mitchell Krueger (first round)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final |
| | Ugo Humbert | 6 | 4 | 6 | | | | | |
| 6 | Norbert Gombos | 3 | 6 | 4 | | | | | |
| 6 | Norbert Gombos | 3 | 6 | 4 | | Ugo Humbert | 4 | 6 | 2 |
| | | | | | 3 | Peter Polansky | 6 | 1 | 6 |
| 3 | Peter Polansky | 7$^8$ | 6 | | 3 | Peter Polansky | 6 | 1 | 6 |
| | Frank Dancevic | 6$^6$ | 4 | | | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | P-H Herbert | 7$^7$ | 6 | | | | | | | | | | | | | | | |
| | V Millot | 6$^4$ | 0 | | 1 | P-H Herbert | 4 | 4 | | | | | | | | | | |
| | U Humbert | 6 | 6 | | | U Humbert | 6 | 6 | | | | | | | | | | |
| WC | A Galarneau | 4 | 2 | | | | | | | U Humbert | 5 | 6 | 4 | | | | | |
| | JC Aragone | 6 | 6 | | | | | | | B Schnur | 7 | 3 | 1$^r$ | | | | | |
| WC | Samuel Monette | 4 | 4 | | | JC Aragone | 3 | 4 | | | | | | | | | | |
| | B Schnur | 6 | 6 | | | B Schnur | 6 | 6 | | | | | | | | | | |
| 5 | L Broady | 4 | 4 | | | | | | | | | | | | U Humbert | 6 | 4 | 6 |
| 4 | M Bachinger | 3 | 6 | 2 | | | | | | | | | | 6 | N Gombos | 3 | 6 | 4 |
| Q | J De Loore | 6 | 4 | 6 | Q | J De Loore | 6 | 7 | | | | | | | | | | |
| WC | Pavel Krainik | 3 | 3 | | | R Tokuda | 1 | 5 | | | | | | | | | | |
| | Renta Tokuda | 6 | 6 | | | | | | Q | J De Loore | 4 | 4 | | | | | | |
| | M Neuchrist | 4 | 6 | 7$^7$ | | | | | 6 | N Gombos | 6 | 6 | | | | | | |
| Q | D Kelly | 6 | 3 | 6$^5$ | | M Neuchrist | 4 | 6$^3$ | | | | | | | | | | |
| | K Uchida | 1 | 4 | | 6 | N Gombos | 6 | 7$^7$ | | | | | | | | | | |
| 6 | N Gombos | 6 | 6 | | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 8 | M Krueger | 6$^3$ | 3 | | | | | | | | | | | | | | |
| | Y Uchiyama | 7$^7$ | 6 | | | Y Uchiyama | 4 | 6$^5$ | | | | | | | | | |
| LL | Jacob Grills | 1 | 6$^5$ | | | S Napolitano | 6 | 7$^7$ | | | | | | | | | |
| | S Napolitano | 6 | 7$^7$ | | | | | | | S Napolitano | 5 | 6$^2$ | | | | | |
| | Z Li | 6 | 6 | | | | | | 3 | P Polansky | 7 | 7$^7$ | | | | | |
| Q | W Trongcharoenchaikul | 2 | 1 | | | Z Li | 4 | 3 | | | | | | | | | |
| | Y Takahashi | 4 | 1 | | 3 | P Polansky | 6 | 6 | | | | | | | | | |
| 3 | P Polansky | 6 | 6 | | | | | | | | | | | 3 | P Polansky | 7$^8$ | 6 |
| 7 | F Peliwo | 6 | 6 | | | | | | | | | | | | F Dancevic | 6$^6$ | 4 |
| | J Menezes | 4 | 3 | | 7 | F Peliwo | 4 | 3 | | | | | | | | | |
| | B Mousley | 6 | 6$^5$ | 4 | | A Sarkissian | 6 | 6 | | | | | | | | | |
| | A Sarkissian | 3 | 7$^7$ | 6 | | | | | | A Sarkissian | 6 | 2 | 4 | | | | |
| WC | B Sigouin | 3 | 6 | 4 | | | | | | F Dancevic | 1 | 6 | 6 | | | | |
| Q | L Miedler | 6 | 2 | 6 | Q | L Miedler | 4 | 4 | | | | | | | | | |
| | F Dancevic | 6 | 6 | | | F Dancevic | 6 | 6 | | | | | | | | | |
| LL | T Garanganga | 4 | 4 | | | | | | | | | | | | | | |