# 2023 Tennis Open Karlsruhe – Singles

This was the first edition of the tournament.
Alejandro Tabilo won the title after Giulio Zeppieri retired leading 6–2, 0–1 in the final.

## Seeds

* Zsombor Piros (semifinals)
* Pavel Kotov (second round)
* Pedro Martínez (second round)
* Giulio Zeppieri (final, retired)
* Thiago Seyboth Wild (quarterfinals)
* Timofey Skatov (semifinals)
* Ivan Gakhov (quarterfinals)
* Alejandro Tabilo (champion)

## 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 | Zsombor Piros | 6 | 3 | 3 | | | | |
| 4 | Giulio Zeppieri | 2 | 6 | 6 | | | | |
| 4 | Giulio Zeppieri | 2 | 6 | 6 | 4 | Giulio Zeppieri | 6 | 0$^r$ |
| | | | | | 8 | Alejandro Tabilo | 2 | 1 |
| 6 | Timofey Skatov | 4 | 1 | | 8 | Alejandro Tabilo | 2 | 1 |
| 8 | Alejandro Tabilo | 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 | Z Piros | 7 | 7$^7$ | | | | | | | | | | | | | | | | |
| | G Blancaneaux | 5 | 6$^5$ | | 1 | Z Piros | 7$^9$ | 6 | | | | | | | | | | | |
| Q | T Handel | 5 | 7 | 6 | Q | T Handel | 6$^7$ | 3 | | | | | | | | | | | |
| Q | Dali Blanch | 7 | 5 | 0 | | | | | | 1 | Z Piros | 6 | 2 | 6 | | | | | |
| | M Zekić | 3 | 4 | | | | | | | 5 | T Seyboth Wild | 3 | 6 | 3 | | | | | |
| WC | M Topo | 6 | 6 | | WC | M Topo | 4 | 2 | | | | | | | | | | | |
| Q | D Yevseyev | 6 | 3 | 3 | 5 | T Seyboth Wild | 6 | 6 | | | | | | | | | | | |
| 5 | T Seyboth Wild | 4 | 6 | 6 | | | | | | | | | | | 1 | Z Piros | 6 | 3 | 3 |
| 4 | G Zeppieri | 6 | 7 | | | | | | | | | | | | 4 | G Zeppieri | 2 | 6 | 6 |
| Q | A Santillan | 3 | 5 | | 4 | G Zeppieri | 4 | 6 | 6 | | | | | | | | | | |
| | H Casanova | 3 | 5 | | | B Paire | 6 | 3 | 4 | | | | | | | | | | |
| | B Paire | 6 | 7 | | | | | | | 4 | G Zeppieri | 6 | 6 | | | | | | |
| | M Geerts | 6 | 3 | 5 | | | | | | 7 | I Gakhov | 1 | 4 | | | | | | |
| | R Molleker | 3 | 6 | 7 | | R Molleker | 4 | 6 | 3 | | | | | | | | | | |
| | N Fatić | 6$^6$ | 2 | | 7 | I Gakhov | 6 | 3 | 6 | | | | | | | | | | |
| 7 | I Gakhov | 7$^8$ | 6 | | | | | | | | | | | | | | | | |

### 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 |
| 6 | T Skatov | 6 | 3 | 6 | | | | | | | | | | | | | | |
| | C Rodesch | 4 | 6 | 2 | 6 | T Skatov | 3 | 7$^{10}$ | 7$^9$ | | | | | | | | | |
| | JP Ficovich | 0 | 3 | | | V Sachko | 6 | 6$^8$ | 6$^7$ | | | | | | | | | |
| | V Sachko | 6 | 6 | | | | | | | 6 | T Skatov | 6 | 6 | | | | | |
| Q | H Habib | 6 | 6 | | | | | | | Q | H Habib | 3 | 2 | | | | | |
| | H Laaksonen | 1 | 3 | | Q | H Habib | 7$^7$ | 7 | | | | | | | | | | |
| | N Gombos | 7$^7$ | 4 | 3 | 3 | P Martínez | 6$^2$ | 5 | | | | | | | | | | |
| 3 | P Martínez | 6$^2$ | 6 | 6 | | | | | | | | | | | 6 | T Skatov | 4 | 1 |
| 8 | A Tabilo | 7 | 6 | | | | | | | | | | | | 8 | A Tabilo | 6 | 6 |
| WC | H Squire | 5 | 1 | | 8 | A Tabilo | 6 | 6 | | | | | | | | | | |
| Q | O Roca Batalla | 6 | 6$^8$ | 6$^3$ | WC | L Gavrielides | 1 | 1 | | | | | | | | | | |
| WC | Liam Gavrielides | 2 | 7$^{10}$ | 7$^7$ | | | | | | 8 | A Tabilo | 6 | 3 | 7 | | | | |
| | V Kopřiva | 6 | 3 | 2 | | | | | | | L Riedi | 1 | 6 | 5 | | | | |
| | L Riedi | 4 | 6 | 6 | | L Riedi | 6 | 7$^9$ | | | | | | | | | | |
| | A Dougaz | 6 | 2 | 5 | 2 | P Kotov | 2 | 6$^7$ | | | | | | | | | | |
| 2 | P Kotov | 2 | 6 | 7 | | | | | | | | | | | | | | |