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

Denis Shapovalov was the defending champion but chose not to defend his title.
Bradley Klahn won the title after defeating Ugo Humbert 6–3, 7–6$^{(7–5)}$ in the final.

## Seeds

* Peter Polansky (quarterfinals)
* Jason Kubler (semifinals)
* Darian King (second round)
* Tatsuma Ito (first round)
* Bradley Klahn (champion)
* Liam Broady (first round)
* Go Soeda (semifinals)
* Filip Peliwo (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 | Final | Final | Final | Final |
| | Ugo Humbert | 6 | 6 | | | | |
| 7 | Go Soeda | 4 | 1 | | | | |
| 7 | Go Soeda | 4 | 1 | | Ugo Humbert | 3 | 6$^5$ |
| | | | | 5 | Bradley Klahn | 6 | 7$^7$ |
| 5 | Bradley Klahn | 6 | 6 | 5 | Bradley Klahn | 6 | 7$^7$ |
| 2 | Jason Kubler | 2 | 3 | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | P Polansky | 7$^7$ | 6$^7$ | 7 | | | | | | | | | | | | | | |
| Q | R Rodríguez | 6$^5$ | 7$^9$ | 5 | 1 | P Polansky | 6 | 7 | | | | | | | | | | |
| WC | Pavel Krainik | 4 | 6 | 6 | WC | P Krainik | 2 | 5 | | | | | | | | | | |
| WC | Samuel Monette | 6 | 4 | 4 | | | | | | 1 | P Polansky | 7$^7$ | 6$^3$ | 6$^4$ | | | | |
| | B Schnur | 3 | 1 | | | | | | | | U Humbert | 6$^4$ | 7$^7$ | 7$^7$ | | | | |
| | U Humbert | 6 | 6 | | | U Humbert | 6 | 6 | | | | | | | | | | |
| WC | B Sigouin | 6 | 6 | | WC | B Sigouin | 4 | 4 | | | | | | | | | | |
| 6 | L Broady | 4 | 2 | | | | | | | | | | | | | U Humbert | 6 | 6 |
| 4 | T Ito | 7$^7$ | 3 | 5 | | | | | | | | | | | 7 | G Soeda | 4 | 1 |
| | M Neuchrist | 6$^2$ | 6 | 7 | | M Neuchrist | 1 | | | | | | | | | | | |
| | Renta Tokuda | 6 | 6$^1$ | 6 | | R Tokuda | 1$^r$ | | | | | | | | | | | |
| Q | E Leshem | 4 | 7$^7$ | 3 | | | | | | | M Neuchrist | 6$^3$ | 3 | | | | | |
| Q | Jacob Grills | 6 | 7$^7$ | | | | | | | 7 | G Soeda | 7$^7$ | 6 | | | | | |
| | A Sarkissian | 3 | 6$^3$ | | Q | J Grills | 6 | 1 | 4 | | | | | | | | | |
| | Y Takahashi | 4 | 3 | | 7 | G Soeda | 2 | 6 | 6 | | | | | | | | | |
| 7 | G Soeda | 6 | 6 | | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 5 | B Klahn | 7 | 7$^7$ | | | | | | | | | | | | | | | |
| | B Mousley | 5 | 6$^3$ | | 5 | B Klahn | 7 | 6 | | | | | | | | | | |
| Q | Y-s Chung | 7$^7$ | 6 | | Q | Y-s Chung | 5 | 4 | | | | | | | | | | |
| | M Krueger | 6$^3$ | 4 | | | | | | | 5 | B Klahn | 6$^7$ | 6 | 6 | | | | |
| | A Ward | 4 | 6$^3$ | | | | | | | | Z Li | 7$^9$ | 4 | 3 | | | | |
| | Z Li | 6 | 7$^7$ | | | Z Li | 2 | 6 | 6 | | | | | | | | | |
| WC | A Galarneau | 6$^5$ | 5 | | 3 | D King | 6 | 4 | 0 | | | | | | | | | |
| 3 | D King | 7$^7$ | 7 | | | | | | | | | | | | 5 | B Klahn | 6 | 6 |
| 8 | F Peliwo | 6 | 4 | 5 | | | | | | | | | | | 2 | J Kubler | 2 | 3 |
| | E Escobedo | 3 | 6 | 7 | | E Escobedo | 6 | 3 | 7$^7$ | | | | | | | | | |
| | J Menezes | 6 | 6 | | | J Menezes | 2 | 6 | 6$^5$ | | | | | | | | | |
| | L Miedler | 3 | 3 | | | | | | | | E Escobedo | 6$^4$ | 7$^7$ | 3 | | | | |
| | L Grigelis | 6 | 7 | | | | | | | 2 | J Kubler | 7$^7$ | 6$^3$ | 6 | | | | |
| | S Napolitano | 2 | 5 | | | L Grigelis | 6$^5$ | 6 | 4 | | | | | | | | | |
| | K Uchida | 1 | 2 | | 2 | J Kubler | 7$^7$ | 4 | 6 | | | | | | | | | |
| 2 | J Kubler | 6 | 6 | | | | | | | | | | | | | | | |