# 2023 Calgary National Bank Challenger – Men's singles

Dominik Koepfer was the defending champion but lost in the final to Liam Draxl.
Draxl won the title after defeating Koepfer 6–4, 6–3 in the final.

## Seeds

* Dominik Koepfer (final)
* James Duckworth (second round)
* Benoît Paire (first round)
* Gabriel Diallo (semifinals, withdrew)
* Ryan Peniston (first round)
* Zizou Bergs (quarterfinals)
* Kimmer Coppejans (first 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 | Semifinals | Final | Final | Final | Final |
| 1 | Dominik Koepfer | w/o | | | | | | |
| 4 | Gabriel Diallo | | | | | | | |
| 4 | Gabriel Diallo | | | | 1 | Dominik Koepfer | 4 | 3 |
| | | | | | WC | Liam Draxl | 6 | 6 |
| | Andres Martin | 6$^5$ | 7 | 3 | WC | Liam Draxl | 6 | 6 |
| WC | Liam Draxl | 7$^7$ | 5 | 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 |
| 1 | D Koepfer | 6 | 6 | | | | | | | | | | | | | |
| | C Broom | 2 | 3 | | 1 | D Koepfer | 6 | 6 | | | | | | | | |
| | C Chidekh | 6 | 6 | | | C Chidekh | 3 | 3 | | | | | | | | |
| | M Vrbenský | 4 | 2 | | | | | | | 1 | D Koepfer | 6 | 6 | | | |
| Q | K Pannu | 6 | 6 | | | | | | | 6 | Z Bergs | 1 | 3 | | | |
| | D Jordà Sanchis | 1 | 4 | | Q | K Pannu | 4 | 5 | | | | | | | | |
| | B Lock | 7$^7$ | 3 | 3 | 6 | Z Bergs | 6 | 7 | | | | | | | | |
| 6 | Z Bergs | 6$^3$ | 6 | 6 | | | | | | | | | | 1 | D Koepfer | w/o |
| 4 | G Diallo | 4 | 7$^{10}$ | 6 | | | | | | | | | | 4 | G Diallo | |
| | A Paulson | 6 | 6$^8$ | 4 | 4 | G Diallo | 5 | 7 | 6 | | | | | | | |
| Q | Patrick Brady | 7 | 4 | 2 | | J Sousa | 7 | 5 | 3 | | | | | | | |
| | J Sousa | 5 | 6 | 6 | | | | | | 4 | G Diallo | 6 | 6 | | | |
| Q | JC Aguilar | 3 | 6 | 3 | | | | | | 8 | A Dougaz | 3 | 2 | | | |
| | S Diez | 6 | 1 | 6 | | S Diez | 3 | 2 | | | | | | | | |
| WC | Dan Martin | 2 | 5 | | 8 | A Dougaz | 6 | 6 | | | | | | | | |
| 8 | A Dougaz | 6 | 7 | | | | | | | | | | | | | |

### 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 | Semifinals |
| 5 | R Peniston | 3 | 4 | | | | | | | | | | | | | | | |
| | A Martin | 6 | 6 | | | A Martin | 7 | 6 | | | | | | | | | | |
| | T Samuel | 7$^8$ | 7$^{10}$ | | | T Samuel | 5 | 4 | | | | | | | | | | |
| Q | R Seggerman | 6$^6$ | 6$^8$ | | | | | | | A Martin | 6 | 6 | | | | | | |
| Q | Enzo Wallart | 1 | 7 | 6 | | | | | Q | E Wallart | 1 | 1 | | | | | | |
| | V Durasovic | 6 | 5 | 3 | Q | E Wallart | 7$^{11}$ | 7$^7$ | | | | | | | | | | |
| | M Kaśnikowski | 6 | 6$^3$ | 6 | | M Kaśnikowski | 6$^9$ | 6$^4$ | | | | | | | | | | |
| 3 | B Paire | 3 | 7$^7$ | 3 | | | | | | | | | | | A Martin | 6$^5$ | 7 | 3 |
| 7 | K Coppejans | 4 | 1 | | | | | | | | | | | WC | L Draxl | 7$^7$ | 5 | 6 |
| WC | L Draxl | 6 | 6 | | WC | L Draxl | 6 | 6 | | | | | | | | | | |
| | L Saville | 7$^9$ | 4 | 6 | | L Saville | 1 | 2 | | | | | | | | | | |
| | T Schoolkate | 6$^7$ | 6 | 3 | | | | | WC | L Draxl | 7 | 5 | 6 | | | | | |
| Q | I Montes de la Torre | 6 | 6 | | | | | | Q | I Montes de la Torre | 5 | 7 | 1 | | | | | |
| WC | J Boulais | 4 | 1 | | Q | I Montes de la Torre | 6 | 6 | | | | | | | | | | |
| | L Tu | 2 | 4 | | 2 | J Duckworth | 3 | 2 | | | | | | | | | | |
| 2 | J Duckworth | 6 | 6 | | | | | | | | | | | | | | | |