# 2023 Challenger Banque Nationale de Drummondville – Singles

Vasek Pospisil was the defending champion but chose not to defend his title.
Zizou Bergs won the title after defeating James Duckworth 6–4, 7–5 in the final.

## Seeds

* Dominik Koepfer (quarterfinals)
* James Duckworth (final)
* Benoît Paire (second round)
* Gabriel Diallo (withdrew)
* Ryan Peniston (quarterfinals)
* Zizou Bergs (champion)
* Alexis Galarneau (second round)
* Aziz Dougaz (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

| Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 6 | Zizou Bergs | w/o | | | | | |
| | Michael Vrbenský | | | | | | |
| | Michael Vrbenský | | | 6 | Zizou Bergs | 6 | 7 |
| | | | | 2 | James Duckworth | 4 | 5 |
| | Li Tu | 4 | 3 | 2 | James Duckworth | 4 | 5 |
| 2 | James Duckworth | 6 | 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 | Quarterfinals | Semifinals | Semifinals | Semifinals |
| 1 | D Koepfer | 5 | 6 | 6 | | | | | | | | | | | | | |
| Q | Luca Wiedenmann | 7 | 2 | 2 | 1 | D Koepfer | 6 | 6 | | | | | | | | | |
| LL | Olaf Pieczkowski | 4 | 6 | 6 | LL | O Pieczkowski | 4 | 4 | | | | | | | | | |
| | A Paulson | 6 | 3 | 1 | | | | | | 1 | D Koepfer | 4 | 6 | 5 | | | |
| Q | Benjamin Thomas George | 6 | 7 | | | | | | | 6 | Z Bergs | 6 | 4 | 7 | | | |
| | B Lock | 1 | 5 | | Q | BT George | 3 | 2 | | | | | | | | | |
| | L Saville | 1 | 1 | | 6 | Z Bergs | 6 | 6 | | | | | | | | | |
| 6 | Z Bergs | 6 | 6 | | | | | | | | | | | | 6 | Z Bergs | w/o |
| Q | Colin Markes | 4 | 6 | 3 | | | | | | | | | | | | M Vrbenský | |
| | M Vrbenský | 6 | 3 | 6 | | M Vrbenský | 6$^4$ | 6 | 7 | | | | | | | | |
| | S Diez | 4 | 7$^9$ | 1 | SE | L Draxl | 7$^7$ | 3 | 5 | | | | | | | | |
| SE | L Draxl | 6 | 6$^7$ | 6 | | | | | | | M Vrbenský | 6 | 3 | 6 | | | |
| | C Broom | 7$^7$ | 4 | 6 | | | | | | 8 | A Dougaz | 2 | 6 | 4 | | | |
| WC | J Boulais | 6$^4$ | 6 | 2 | | C Broom | 6 | 4 | 1 | | | | | | | | |
| | M Kaśnikowski | 4 | 6 | 5 | 8 | A Dougaz | 3 | 6 | 6 | | | | | | | | |
| 8 | A Dougaz | 6 | 3 | 7 | | | | | | | | | | | | | |

### 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 |
| 7 | A Galarneau | 6 | 3 | 6 | | | | | | | | | | | | | | |
| | D Jordà Sanchis | 3 | 6 | 4 | 7 | A Galarneau | 6$^5$ | 2 | | | | | | | | | | |
| | M Janvier | 6 | 6$^3$ | 3 | | L Tu | 7$^7$ | 6 | | | | | | | | | | |
| | L Tu | 4 | 7$^7$ | 6 | | | | | | | L Tu | 6 | 7 | | | | | |
| | T Samuel | 6 | 0 | 3 | | | | | | | J Sousa | 4 | 5 | | | | | |
| | J Sousa | 3 | 6 | 6 | | J Sousa | 6 | 7$^7$ | | | | | | | | | | |
| WC | JC Aguilar | 3 | 4 | | 3 | B Paire | 1 | 6$^4$ | | | | | | | | | | |
| 3 | B Paire | 6 | 6 | | | | | | | | | | | | | L Tu | 4 | 3 |
| 5 | R Peniston | 6 | 6 | | | | | | | | | | | | 2 | J Duckworth | 6 | 6 |
| Q | K Pannu | 3 | 1 | | 5 | R Peniston | 6 | 0 | | | | | | | | | | |
| WC | Dan Martin | 2 | | | WC | D Martin | 2 | 0$^r$ | | | | | | | | | | |
| Q | Alexander Kotzen | 1$^r$ | | | | | | | | 5 | R Peniston | 6 | 3 | 4 | | | | |
| | T-S Kwiatkowski | 7$^7$ | 0 | 7 | | | | | | 2 | J Duckworth | 4 | 6 | 6 | | | | |
| Q | G Hussey | 6$^4$ | 6 | 5 | | T-S Kwiatkowski | 1 | 7$^7$ | 3 | | | | | | | | | |
| | C Kingsley | 5 | 7$^7$ | 6$^5$ | 2 | J Duckworth | 6 | 6$^3$ | 6 | | | | | | | | | |
| 2 | J Duckworth | 7 | 6$^2$ | 7$^7$ | | | | | | | | | | | | | | |