# 2023 IBG Prague Open – Singles

Oleksii Krutykh was the defending champion but chose not to defend his title.
Rudolf Molleker won the title after defeating Gabriel Debru 6–2, 6–2 in the final.

## Seeds

* Lukas Neumayer (first round)
* Francesco Maestrelli (first round)
* Luciano Darderi (quarterfinals)
* Rudolf Molleker (champion)
* João Sousa (semifinals)
* Henri Squire (first round)
* Mathias Bourgue (first round)
* Valentin Vacherot (semifinals)

## 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 |
| Q | Gabriel Debru | 5 | 6 | 6 | | | | |
| 5 | João Sousa | 7 | 3 | 4 | | | | |
| 5 | João Sousa | 7 | 3 | 4 | Q | Gabriel Debru | 2 | 2 |
| | | | | | 4 | Rudolf Molleker | 6 | 6 |
| 4 | Rudolf Molleker | 6 | 7$^7$ | | 4 | Rudolf Molleker | 6 | 6 |
| 8 | Valentin Vacherot | 4 | 6$^5$ | | | | | |

### 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 | L Neumayer | 6 | 3 | 4 | | | | | | | | | | | | | | | |
| Q | G Debru | 2 | 6 | 6 | Q | G Debru | 7 | 6 | | | | | | | | | | | |
| WC | Hynek Bartoň | 6 | 3 | 2 | Q | J Nicod | 5 | 1 | | | | | | | | | | | |
| Q | Jakub Nicod | 1 | 6 | 6 | | | | | | Q | G Debru | 7$^7$ | 6$^3$ | 6 | | | | | |
| | C Hemery | 4 | 6 | 2 | | | | | | WC | T Kodat | 6$^4$ | 7$^7$ | 4 | | | | | |
| WC | T Kodat | 6 | 1 | 6 | WC | T Kodat | 6 | 6 | | | | | | | | | | | |
| | H Laaksonen | 4 | 7$^7$ | 6 | | H Laaksonen | 3 | 3 | | | | | | | | | | | |
| 7 | M Bourgue | 6 | 6$^3$ | 2 | | | | | | | | | | | Q | G Debru | 5 | 6 | 6 |
| 3 | L Darderi | 6 | 6$^7$ | 7$^7$ | | | | | | | | | | | 5 | J Sousa | 7 | 3 | 4 |
| | M Janvier | 3 | 7$^9$ | 6$^5$ | 3 | L Darderi | 6 | 6 | | | | | | | | | | | |
| Q | M Vrbenský | 6 | 7 | | Q | M Vrbenský | 4 | 1 | | | | | | | | | | | |
| | D Jordà Sanchis | 3 | 5 | | | | | | | 3 | L Darderi | 5 | 6 | 6$^3$ | | | | | |
| WC | J Forejtek | 6 | 3 | 6 | | | | | | 5 | J Sousa | 7 | 3 | 7$^7$ | | | | | |
| | J Barranco Cosano | 4 | 6 | 4 | WC | J Forejtek | 0 | 6 | 4 | | | | | | | | | | |
| | V Royer | 4 | 1 | | 5 | J Sousa | 6 | 4 | 6 | | | | | | | | | | |
| 5 | J Sousa | 6 | 6 | | | | | | | | | | | | | | | | |

### Bottom 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 | Semifinals |
| 6 | H Squire | 6 | 4 | 3 | | | | | | | | | | | | |
| Q | FA Gómez | 4 | 6 | 6 | Q | FA Gómez | 6 | 6 | | | | | | | | |
| | L Giustino | 6 | 6 | | | L Giustino | 3 | 3 | | | | | | | | |
| | FC Jianu | 4 | 3 | | | | | | Q | FA Gómez | 3 | 3 | | | | |
| | M Gengel | 2 | 2 | | | | | | 4 | R Molleker | 6 | 6 | | | | |
| | M Chazal | 6 | 6 | | | M Chazal | 2 | 2 | | | | | | | | |
| | L Rosol | 3 | 4 | | 4 | R Molleker | 6 | 6 | | | | | | | | |
| 4 | R Molleker | 6 | 6 | | | | | | | | | | 4 | R Molleker | 6 | 7$^7$ |
| 8 | V Vacherot | 6 | 6 | | | | | | | | | | 8 | V Vacherot | 4 | 6$^5$ |
| Q | Kirill Kivattsev | 4 | 4 | | 8 | V Vacherot | 6 | 6 | | | | | | | | |
| | F Mena | 7 | 6 | | | F Mena | 2 | 4 | | | | | | | | |
| PR | Carlos López Montagud | 5 | 3 | | | | | | 8 | V Vacherot | 7$^7$ | 6 | | | | |
| | A Paulson | 6 | 6 | | | | | | | A Paulson | 6$^5$ | 2 | | | | |
| Q | Paweł Ciaś | 4 | 4 | | | A Paulson | 6 | 6 | | | | | | | | |
| | Mathys Erhard | 7$^7$ | 5 | 6 | | M Erhard | 3 | 3 | | | | | | | | |
| 2 | F Maestrelli | 6$^0$ | 7 | 3 | | | | | | | | | | | | |