# 2019 Challenger Banque Nationale de Gatineau – Men's singles

Bradley Klahn was the defending champion but chose not to defend his title.
Jason Kubler won the title after defeating Enzo Couacaud 6–4, 6–4 in the final.

## Seeds

All seeds receive a bye into the second round.
* Antoine Hoang (second round)
* Kwon Soon-woo (third round)
* Peter Polansky (third round)
* Michael Mmoh (third round)
* Dudi Sela (third round)
* Norbert Gombos (quarterfinals)
* Mikael Torpegaard (second round)
* Yasutaka Uchiyama (third round)
* Vasek Pospisil (withdrew)
* Jason Kubler (champion)
* Marc Polmans (quarterfinals)
* Darian King (semifinals)
* Maxime Janvier (quarterfinals)
* Thanasi Kokkinakis (withdrew)
* Enzo Couacaud (final)
* Lee Duck-hee (quarterfinals)

## 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

| Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 16 | Lee Duck-hee | 2 | 3 | | | | | | | | | |
| 10 | Jason Kubler | 6 | 6 | | | | | | | | | |
| 10 | Jason Kubler | 6 | 6 | | 10 | Jason Kubler | 6 | 6 | | | | |
| | | | | | | João Menezes | 3 | 1 | | | | |
| | João Menezes | 4 | 7 | 7 | | João Menezes | 3 | 1 | | | | |
| 6 | Norbert Gombos | 6 | 5 | 5 | | | | | | | | |
| 6 | Norbert Gombos | 6 | 5 | 5 | | | | | 10 | Jason Kubler | 6 | 6 |
| | | | | | | | | | 15 | Enzo Couacaud | 4 | 4 |
| 12 | Darian King | 6 | 1 | 6 | | | | | | | | | 15 | Enzo Couacaud | 4 | 4 |
| 13 | Maxime Janvier | 3 | 6 | 1 | | | | | | | | |
| 13 | Maxime Janvier | 3 | 6 | 1 | 12 | Darian King | 2 | 4 | | | | |
| | | | | | 15 | Enzo Couacaud | 6 | 6 | | | | |
| 11 | Marc Polmans | 1 | 4 | | 15 | Enzo Couacaud | 6 | 6 | | | | |
| 15 | Enzo Couacaud | 6 | 6 | | | | | | | | | |

### Top half
#### Section 1

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 1 | A Hoang | 3 | 6 | 6$^4$ | | | | | | | | |
| WC | A Galarneau | 7 | 2 | 6 | WC | A Galarneau | 6 | 3 | 7$^7$ | | | | | | | | |
| | MT Barrios Vera | 5 | 6 | 3 | | | | | | WC | A Galarneau | 3 | 5 | | | | |
| | E Escobedo | 6 | 6 | | | | | | | 16 | D-h Lee | 6 | 7 | | | | |
| | A Sarkissian | 1 | 3 | | | E Escobedo | 4 | 6 | 6$^4$ | | | | | | | | |
| | | | | | 16 | D-h Lee | 6 | 4 | 7$^7$ | | | | | | | | |
| | | | | | | | | | | | | | | 16 | D-h Lee | 2 | 3 |
| | | | | | | | | | | | | | | 10 | J Kubler | 6 | 6 |
| | | | | | 10 | J Kubler | 6 | 6 | | | | | | | | | |
| ITF | E Hoyt | 1 | 4 | | | H Moriya | 2 | 2 | | | | | | | | | |
| | H Moriya | 6 | 6 | | | | | | | 10 | J Kubler | 6 | 7 | | | | |
| | Mi Redlicki | 6 | 4 | 7 | | | | | | 5 | D Sela | 2 | 5 | | | | |
| | D Petrović | 3 | 6 | 5 | | Mi Redlicki | 2 | 1 | | | | | | | | | |
| | | | | | 5 | D Sela | 6 | 6 | | | | | | | | | |

#### Section 2

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | 3 | P Polansky | 5 | 6 | 6 | | | | | | | | | | |
| | K Uchida | 6 | 6 | | K Uchida | 7 | 2 | 1 | | | | | | | | | | |
| | Roy Smith | 3 | 4 | | | | | | 3 | P Polansky | 6 | 4 | 2 | | | | | |
| | J Menezes | 6 | 6 | | | | | | | J Menezes | 4 | 6 | 6 | | | | | |
| Q | D Novikov | 4 | 2 | | J Menezes | 4 | 6 | 6 | | | | | | | | | | |
| | | | | | A Harris | 6 | 3 | 4 | | | | | | | | | | |
| | | | | | | | | | | | | | | | J Menezes | 4 | 7 | 7 |
| | | | | | | | | | | | | | | 6 | N Gombos | 6 | 5 | 5 |
| | | | | LL | B Klein | 4 | 5 | | | | | | | | | | | |
| | Z Li | 1 | 1 | Alt | M Neuchrist | 6 | 7 | | | | | | | | | | | |
| Alt | M Neuchrist | 6 | 6 | | | | | | Alt | M Neuchrist | 6$^5$ | 3 | | | | | | |
| | R Ortega Olmedo | 1 | 4 | | | | | | 6 | N Gombos | 7$^7$ | 6 | | | | | | |
| ITF | S Mansouri | 6 | 6 | ITF | S Mansouri | 0 | 4 | | | | | | | | | | | |
| | | | | 6 | N Gombos | 6 | 6 | | | | | | | | | | | |

### Bottom half
#### Section 3

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 8 | Y Uchiyama | 6 | 6 | | | | | | | | | | | |
| | Yo Watanuki | 6$^6$ | 6 | 6 | | Yo Watanuki | 4 | 2 | | | | | | | | | | | |
| Q | Jacob Grills | 7$^8$ | 1 | 0 | | | | | | 8 | Y Uchiyama | 6 | 2 | 3 | | | | | |
| WC | L Draxl | 6 | 6 | | | | | | | 12 | D King | 4 | 6 | 6 | | | | | |
| ITF | Jordi Arconada | 2 | 4 | | WC | L Draxl | 6 | 5 | 2 | | | | | | | | | | |
| | | | | | 12 | D King | 3 | 7 | 6 | | | | | | | | | | |
| | | | | | | | | | | | | | | | 12 | D King | 6 | 1 | 6 |
| | | | | | | | | | | | | | | | 13 | M Janvier | 3 | 6 | 1 |
| | | | | | 13 | M Janvier | 4 | 7$^7$ | 6 | | | | | | | | | | |
| | B Gojo | 5 | 6 | 6 | | B Gojo | 6 | 6$^4$ | 3 | | | | | | | | | | |
| WC | B Sigouin | 7 | 3 | 2 | | | | | | 13 | M Janvier | 7 | 5 | 6 | | | | | |
| | C Altamirano | 1 | 6$^1$ | | | | | | | 4 | M Mmoh | 5 | 7 | 4 | | | | | |
| WC | B Holt | 6 | 7$^7$ | | WC | B Holt | 4 | 2 | | | | | | | | | | | |
| | | | | | 4 | M Mmoh | 6 | 6 | | | | | | | | | | | |

#### Section 4

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 7 | M Torpegaard | 4 | 6 | 2 | | | | | | | | | |
| | M Banes | 3 | 2 | | | C İlkel | 6 | 4 | 6 | | | | | | | | | |
| | C İlkel | 6 | 6 | | | | | | | | C İlkel | 3 | 6 | 1 | | | | |
| | J. J. Wolf | 6 | 6 | | | | | | | 11 | M Polmans | 6 | 1 | 6 | | | | |
| | G Sakharov | 4 | 2 | | | J. J. Wolf | 3 | 6 | 5 | | | | | | | | | |
| | | | | | 11 | M Polmans | 6 | 4 | 7 | | | | | | | | | |
| | | | | | | | | | | | | | | | 11 | M Polmans | 1 | 4 |
| | | | | | | | | | | | | | | | 15 | E Couacaud | 6 | 6 |
| | | | | | 15 | E Couacaud | 6 | 6 | | | | | | | | | | |
| | A Santillan | 6 | 3 | 1 | PR | C Gómez-Herrera | 2 | 3 | | | | | | | | | | |
| PR | C Gómez-Herrera | 3 | 6 | 6 | | | | | | 15 | E Couacaud | 7 | 7 | | | | | |
| ITF | Shintaro Imai | 6 | 2 | 7 | | | | | | 2 | S-w Kwon | 5 | 5 | | | | | |
| ITF | A Tabilo | 4 | 6 | 5 | ITF | S Imai | 2 | 3 | | | | | | | | | | |
| | | | | | 2 | S-w Kwon | 6 | 6 | | | | | | | | | | |