# 2023 Poznań Open – Singles

Arthur Rinderknech was the defending champion but chose not to defend his title.
Mariano Navone won the title after defeating Tomás Barrios Vera 7–5, 6–3 in the final.

## Seeds

* Alexander Shevchenko (first round)
* Federico Coria (first round)
* Tomáš Macháč (first round)
* Facundo Díaz Acosta (quarterfinals)
* Tomás Barrios Vera (final)
* Geoffrey Blancaneaux (first round, retired)
* Damir Džumhur (first round)
* Dalibor Svrčina (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 |
| 5 | Tomás Barrios Vera | 6 | 1 | 6 | | | | |
| | Zdeněk Kolář | 4 | 6 | 3 | | | | |
| | Zdeněk Kolář | 4 | 6 | 3 | 5 | Tomás Barrios Vera | 5 | 3 |
| | | | | | | Mariano Navone | 7 | 6 |
| Alt | Timo Stodder | 2 | 0 | | | Mariano Navone | 7 | 6 |
| | Mariano Navone | 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 | Semifinals | Semifinals |
| 1 | A Shevchenko | 3 | 2 | | | | | | | | | | | | | | | | |
| WC | Dali Blanch | 6 | 6 | | WC | D Blanch | 6 | 3 | 4 | | | | | | | | | | |
| Q | U Blanch | 7$^7$ | 0 | | Q | U Blanch | 1 | 6 | 6 | | | | | | | | | | |
| | V Sachko | 6$^5$ | 0$^r$ | | | | | | | Q | U Blanch | 3 | 7 | 5 | | | | | |
| | G Mpetshi Perricard | 7$^{10}$ | 3 | 7$^{13}$ | | | | | | 5 | T Barrios Vera | 6 | 5 | 7 | | | | | |
| | J Menšík | 6$^8$ | 6 | 6$^{11}$ | | G Mpetshi Perricard | 6$^2$ | 3 | | | | | | | | | | | |
| Alt | M Houkes | 1 | 6$^2$ | | 5 | T Barrios Vera | 7$^7$ | 6 | | | | | | | | | | | |
| 5 | T Barrios Vera | 6 | 7$^7$ | | | | | | | | | | | | 5 | T Barrios Vera | 6 | 1 | 6 |
| 4 | F Díaz Acosta | 3 | 6 | 6 | | | | | | | | | | | | Z Kolář | 4 | 6 | 3 |
| | L Giustino | 6 | 2 | 4 | 4 | F Díaz Acosta | 6 | 2 | 6 | | | | | | | | | | |
| | S Nagal | 6 | 6 | | | S Nagal | 1 | 6 | 4 | | | | | | | | | | |
| WC | L Borg | 2 | 3 | | | | | | | 4 | F Díaz Acosta | 3 | 1 | | | | | | |
| LL | C Taberner | 6 | 7$^7$ | | | | | | | | Z Kolář | 6 | 6 | | | | | | |
| | K Żuk | 4 | 6$^3$ | | LL | C Taberner | 4 | 1 | | | | | | | | | | | |
| | Z Kolář | 6 | 6 | | | Z Kolář | 6 | 6 | | | | | | | | | | | |
| 7 | D Džumhur | 2 | 2 | | | | | | | | | | | | | | | | |

### 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 |
| 8 | D Svrčina | 5 | 6$^4$ | | | | | | | | | | | | | | | |
| | Pol Martín Tiffon | 7 | 7$^7$ | | | P Martín Tiffon | 4 | 6 | 0 | | | | | | | | | |
| Q | D Jordà Sanchis | 6$^2$ | 3 | | Alt | T Stodder | 6 | 3 | 6 | | | | | | | | | |
| Alt | Timo Stodder | 7$^7$ | 6 | | | | | | | Alt | T Stodder | 6 | 6 | | | | | |
| | D Michalski | 5 | 6 | 6 | | | | | | | D Michalski | 1 | 4 | | | | | |
| | M Valkusz | 7 | 4 | 1 | | D Michalski | 6 | 6 | | | | | | | | | | |
| Q | R Molleker | 7 | 7$^7$ | | Q | R Molleker | 4 | 2 | | | | | | | | | | |
| 3 | T Macháč | 5 | 6$^1$ | | | | | | | | | | | | Alt | T Stodder | 2 | 0 |
| 6 | G Blancaneaux | 2 | 3$^r$ | | | | | | | | | | | | | M Navone | 6 | 6 |
| Q | M Guinard | 6 | 4 | | Q | M Guinard | 6 | 6 | | | | | | | | | | |
| Q | J Kym | 6 | 6 | | Q | J Kym | 3 | 4 | | | | | | | | | | |
| Q | N Oberleitner | 1 | 2 | | | | | | | Q | M Guinard | 5 | 7$^7$ | 2 | | | | |
| WC | M Kaśnikowski | 6 | 2 | 7$^7$ | | | | | | | M Navone | 7 | 6$^3$ | 6 | | | | |
| | H Laaksonen | 1 | 6 | 6$^4$ | WC | M Kaśnikowski | 4 | 6$^4$ | | | | | | | | | | |
| | M Navone | 3 | 6 | 6 | | M Navone | 6 | 7$^7$ | | | | | | | | | | |
| 2 | F Coria | 6 | 3 | 1 | | | | | | | | | | | | | | |