# 2023 Banja Luka Challenger – Singles

Fábián Marozsán was the defending champion but withdrew before his semifinal match against Dino Prižmić.
Prižmić won the title after defeating Kimmer Coppejans 6–2, 6–3 in the final.

## Seeds

* Fábián Marozsán (semifinals, withdrew)
* Marco Cecchinato (first round)
* Alex Molčan (second round)
* Benoît Paire (second round)
* Kimmer Coppejans (final)
* Mariano Navone (second round)
* Zdeněk Kolář (first round)
* Damir Džumhur (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 |
| 1 | Fábián Marozsán | | | | | | |
| | Dino Prižmić | w/o | | | | | |
| | Dino Prižmić | w/o | | | Dino Prižmić | 6 | 6 |
| | | | | 5 | Kimmer Coppejans | 2 | 3 |
| 5 | Kimmer Coppejans | 6 | 6 | 5 | Kimmer Coppejans | 2 | 3 |
| Q | Marko Topo | 0 | 1 | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals |
| 1 | F Marozsán | 3 | 6 | 6 | | | | | | | | | | | |
| | V Durasovic | 6 | 0 | 3 | 1 | F Marozsán | 6 | 6 | | | | | | | |
| | C Tabur | 7$^7$ | 7$^7$ | | | C Tabur | 3 | 2 | | | | | | | |
| | K Ivanovski | 6$^4$ | 6$^3$ | | | | | | 1 | F Marozsán | 6 | 6 | | | |
| WC | A Nedić | 7 | 6$^4$ | 3 | | | | | | J Barranco Cosano | 2 | 0 | | | |
| | J Barranco Cosano | 5 | 7$^7$ | 6 | | J Barranco Cosano | 6 | 7$^7$ | | | | | | | |
| Alt | K Jacquet | 6 | 3 | 3 | 6 | M Navone | 2 | 6$^5$ | | | | | | | |
| 6 | M Navone | 3 | 6 | 6 | | | | | | | | | 1 | F Marozsán | |
| 3/WC | A Molčan | 6 | 6 | | | | | | | | | | | D Prižmić | w/o |
| Q | M Zekić | 1 | 2 | | 3/WC | A Molčan | 1 | 4 | | | | | | | |
| Q | A Santillan | 6 | 3 | 3$^r$ | | D Prižmić | 6 | 6 | | | | | | | |
| | D Prižmić | 2 | 6 | 5 | | | | | | D Prižmić | 6 | 6 | | | |
| | N Sánchez Izquierdo | 4 | 5 | | | | | | 8 | D Džumhur | 3 | 4 | | | |
| | D Ajduković | 6 | 7 | | | D Ajduković | 2 | 5 | | | | | | | |
| | M Polmans | 3 | 1 | | 8 | D Džumhur | 6 | 7 | | | | | | | |
| 8 | D Džumhur | 6 | 6 | | | | | | | | | | | | |

### Bottom half

| 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 |
| 5 | K Coppejans | 6 | 6 | | | | | | | | | | | | | |
| Q | M Bašić | 3 | 4 | 5 | K Coppejans | 6$^7$ | 6 | 7 | | | | | | | | |
| | N Fatić | 3 | 0$^r$ | | N Serdarušić | 7$^9$ | 3 | 5 | | | | | | | | |
| | N Serdarušić | 6 | 0 | | | | | | 5 | K Coppejans | 3 | | | | | |
| | FC Jianu | 6$^0$ | 2 | | | | | | | N Gombos | 5$^r$ | | | | | |
| | N Gombos | 7$^7$ | 6 | | N Gombos | 6 | 6 | | | | | | | | | |
| Q | A Šetkić | 2 | 5 | 4 | B Paire | 4 | 2 | | | | | | | | | |
| 4 | B Paire | 6 | 7 | | | | | | | | | | 5 | K Coppejans | 6 | 6 |
| 7 | Z Kolář | 4 | 4 | | | | | | | | | | Q | M Topo | 0 | 1 |
| Q | Eric Vanshelboim | 6 | 6 | Q | E Vanshelboim | 5 | 1 | | | | | | | | | |
| SE | T Kodat | 6 | 6 | SE | T Kodat | 7 | 6 | | | | | | | | | |
| SE | U Blanchet | 4 | 3 | | | | | | SE | T Kodat | 3 | 3 | | | | |
| Q | M Topo | 6 | 6 | | | | | | Q | M Topo | 6 | 6 | | | | |
| | G Blancaneaux | 0 | 2 | Q | M Topo | 6 | 6 | | | | | | | | | |
| | DN Mădăraș | 6 | 6 | | DN Mădăraș | 3 | 4 | | | | | | | | | |
| 2/WC | M Cecchinato | 2 | 1 | | | | | | | | | | | | | |