# 2023 Championnats Banque Nationale de Granby – Men's singles

Gabriel Diallo was the defending champion but chose not to defend his title.
Alexis Galarneau won the title after defeating Philip Sekulic 6–4, 3–6, 6–3 in the final.

## Seeds

* Thanasi Kokkinakis (second round, retired)
* Arthur Cazaux (second round)
* Shang Juncheng (first round)
* Vasek Pospisil (first round)
* Denis Kudla (second round)
* Rio Noguchi (first round)
* Alexis Galarneau (champion)
* Giovanni Mpetshi Perricard (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 |
| Q | James Trotter | 4 | 6 | 6$^3$ | | | | | |
| Q | Philip Sekulic | 6 | 2 | 7$^7$ | | | | | |
| Q | Philip Sekulic | 6 | 2 | 7$^7$ | Q | Philip Sekulic | 4 | 6 | 3 |
| | | | | | 7 | Alexis Galarneau | 6 | 3 | 6 |
| | Wu Tung-lin | 6$^4$ | 3 | | 7 | Alexis Galarneau | 6 | 3 | 6 |
| 7 | Alexis Galarneau | 7$^7$ | 6 | | | | | | |

### 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 | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | T Kokkinakis | 6 | 6$^6$ | 6 | | | | | | | | | | | | | | |
| Q | P Kypson | 2 | 7$^8$ | 4 | 1 | T Kokkinakis | 6$^5$ | 0$^r$ | | | | | | | | | | |
| Q | J Trotter | 6 | 7$^7$ | | Q | J Trotter | 7$^7$ | 2 | | | | | | | | | | |
| LL | Nathan Ponwith | 3 | 6$^1$ | | | | | | | Q | J Trotter | 7$^{10}$ | 6 | | | | | |
| | J McCabe | 7$^7$ | 6 | | | | | | | | J McCabe | 6$^8$ | 2 | | | | | |
| | T Sandgren | 6$^4$ | 3 | | | J McCabe | 6 | 6 | | | | | | | | | | |
| | D Sweeny | 3 | 6 | 6 | | D Sweeny | 4 | 2 | | | | | | | | | | |
| 8 | G Mpetshi Perricard | 6 | 4 | 4 | | | | | | | | | | Q | J Trotter | 4 | 6 | 6$^3$ |
| 3 | J Shang | 2 | 2 | | | | | | | | | | | Q | P Sekulic | 6 | 2 | 7$^7$ |
| | M Lajal | 6 | 6 | | | M Lajal | 4 | 6 | 6$^5$ | | | | | | | | | |
| Q | B Bicknell | 0 | 6 | 4 | WC | J Boulais | 6 | 1 | 7$^7$ | | | | | | | | | |
| WC | J Boulais | 6 | 4 | 6 | | | | | | WC | J Boulais | 3 | 2 | | | | | |
| Q | P Sekulic | 6$^6$ | 7$^7$ | 6 | | | | | | Q | P Sekulic | 6 | 6 | | | | | |
| | Y Uchiyama | 7$^8$ | 6$^4$ | 1 | Q | P Sekulic | 7 | 6 | | | | | | | | | | |
| | H Moriya | 4 | 7 | 2 | 5 | D Kudla | 5 | 3 | | | | | | | | | | |
| 5 | D Kudla | 6 | 5 | 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| 6 | R Noguchi | 0 | 2 | | | | | | | | | | | | | | |
| | T-l Wu | 6 | 6 | | | T-l Wu | 6 | 6 | | | | | | | | | |
| LL | A Cozbinov | 1 | 3 | | PR | C Harrison | 3 | 4 | | | | | | | | | |
| PR | C Harrison | 6 | 6 | | | | | | | | T-l Wu | 6 | 6 | | | | |
| | M Janvier | 7$^8$ | 6 | | | | | | | | M Janvier | 4 | 4 | | | | |
| | J Jung | 6$^6$ | 3 | | | M Janvier | 6 | 4 | 7$^7$ | | | | | | | | |
| | A Walton | 6$^7$ | 7$^7$ | 6 | | A Walton | 4 | 6 | 6$^4$ | | | | | | | | |
| 4 | V Pospisil | 7$^9$ | 6$^1$ | 1 | | | | | | | | | | | T-l Wu | 6$^4$ | 3 |
| 7 | A Galarneau | 6 | 3 | 6 | | | | | | | | | | 7 | A Galarneau | 7$^7$ | 6 |
| | O Jasika | 1 | 6 | 3 | 7 | A Galarneau | 6 | 7$^8$ | | | | | | | | | |
| Q | N Chappell | 5 | 3 | | PR | T-S Kwiatkowski | 2 | 6$^6$ | | | | | | | | | |
| PR | T-S Kwiatkowski | 7 | 6 | | | | | | | 7 | A Galarneau | 6 | 6 | | | | |
| Alt | T Schoolkate | 6 | 6 | | | | | | | Alt | T Schoolkate | 4 | 3 | | | | |
| Q | Joshua Sheehy | 2 | 3 | | Alt | T Schoolkate | 6 | 6 | | | | | | | | | |
| | NH Lý | 1 | 6$^7$ | | 2 | A Cazaux | 3 | 3 | | | | | | | | | |
| 2 | A Cazaux | 6 | 7$^9$ | | | | | | | | | | | | | | |