# 2023 Kozerki Open – Singles

Tomáš Macháč was the defending champion but lost in the second round to Denis Yevseyev.
Jesper de Jong won the title after defeating Benjamin Hassan 6–3, 6–3 in the final.

## Seeds

* Tomáš Macháč (second round)
* Joris De Loore (first round)
* Zdeněk Kolář (withdrew)
* Marc Polmans (second round)
* Jesper de Jong (champion)
* Elias Ymer (semifinals)
* Jelle Sels (first round)
* Frederico Ferreira Silva (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 | Final | Final | Final | Final |
| Q | Denis Yevseyev | 4 | 4 | | | | |
| | Benjamin Hassan | 6 | 6 | | | | |
| | Benjamin Hassan | 6 | 6 | | Benjamin Hassan | 3 | 3 |
| | | | | 5 | Jesper de Jong | 6 | 6 |
| 5 | Jesper de Jong | 7$^9$ | 6 | 5 | Jesper de Jong | 6 | 6 |
| 6 | Elias Ymer | 6$^7$ | 1 | | | | |

### 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 | Semifinals |
| 1 | T Macháč | 6 | 6 | | | | | | | | | | | | | | | |
| | F Peliwo | 1 | 1 | | 1 | T Macháč | 5 | 6$^5$ | | | | | | | | | | |
| WC | T Berkieta | 3 | 1 | | Q | D Yevseyev | 7 | 7$^7$ | | | | | | | | | | |
| Q | D Yevseyev | 6 | 6 | | | | | | | Q | D Yevseyev | 6 | 3 | 7$^7$ | | | | |
| | M Janvier | 7$^7$ | 6 | | | | | | | | M Janvier | 3 | 6 | 6$^5$ | | | | |
| | A Bellier | 6$^1$ | 3 | | | M Janvier | 6 | 5 | 6 | | | | | | | | | |
| | S Mansouri | 7$^7$ | 6 | | | S Mansouri | 1 | 7 | 2 | | | | | | | | | |
| 8 | F Ferreira Silva | 6$^4$ | 3 | | | | | | | | | | | | Q | D Yevseyev | 4 | 4 |
| 4 | M Polmans | 6 | 6 | | | | | | | | | | | | | B Hassan | 6 | 6 |
| Q | Adrià Soriano Barrera | 3 | 4 | | 4 | M Polmans | 2 | 2 | | | | | | | | | | |
| Q | M Copil | 6 | 1 | 6 | Q | M Copil | 6 | 6 | | | | | | | | | | |
| | K Ivanovski | 4 | 6 | 4 | | | | | | Q | M Copil | 5 | 1 | | | | | |
| | B Hassan | 6 | 6 | | | | | | | | B Hassan | 7 | 6 | | | | | |
| WC | Martyn Pawelski | 2 | 0 | | | B Hassan | 4 | 7$^7$ | 7$^7$ | | | | | | | | | |
| Q | J Veselý | 6 | 7 | | Q | J Veselý | 6 | 6$^5$ | 6$^5$ | | | | | | | | | |
| 7 | J Sels | 4 | 5 | | | | | | | | | | | | | | | |

### 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 |
| 5 | J de Jong | 6 | 4 | | | | | | | | | | | | | | |
| | S Rodríguez Taverna | 3 | 3$^r$ | | 5 | J de Jong | 6 | 6 | | | | | | | | | |
| | R Berankis | 1 | 6 | 2 | Alt | C Broom | 4 | 4 | | | | | | | | | |
| Alt | C Broom | 6 | 3 | 6 | | | | | | 5 | J de Jong | 6 | 6 | | | | |
| WC | Dali Blanch | 2 | 1 | | | | | | | | M Kaśnikowski | 0 | 2 | | | | |
| Alt | P Gojowczyk | 6 | 6 | | Alt | P Gojowczyk | 3 | 4 | | | | | | | | | |
| | M Kaśnikowski | 6 | 6 | | | M Kaśnikowski | 6 | 6 | | | | | | | | | |
| LL | S Sakellaridis | 2 | 0 | | | | | | | | | | | 5 | J de Jong | 7$^9$ | 6 |
| 6 | E Ymer | 6 | 6 | | | | | | | | | | | 6 | E Ymer | 6$^7$ | 1 |
| Q | David Poljak | 4 | 3 | | 6 | E Ymer | 4 | 6 | 6 | | | | | | | | |
| | S Napolitano | 6 | 4 | 6$^2$ | | J Marie | 6 | 3 | 4 | | | | | | | | |
| | Jules Marie | 3 | 6 | 7$^7$ | | | | | | 6 | E Ymer | 6 | 6 | | | | |
| Q | A Santillan | 3 | 2 | | | | | | | | K Żuk | 3 | 4 | | | | |
| | K Żuk | 6 | 6 | | | K Żuk | 6 | 3 | 7 | | | | | | | | |
| Alt | V Durasovic | 1 | 7$^8$ | 7$^7$ | Alt | V Durasovic | 4 | 6 | 5 | | | | | | | | |
| 2 | J De Loore | 6 | 6$^6$ | 6$^4$ | | | | | | | | | | | | | |