# 2023 Wolffkran Open – Singles

Quentin Halys was the defending champion but chose not to defend his title.
Antoine Bellier won the title after defeating Maximilian Marterer 7–6$^{(7–5)}$, 6–7$^{(5–7)}$, 7–6$^{(8–6)}$ in the final.

## Seeds

* Dominic Stricker (second round, retired)
* Maximilian Marterer (final)
* Maxime Cressy (first round)
* Lloyd Harris (withdrew)
* Damir Džumhur (first round)
* Jan Choinski (first round)
* Vitaliy Sachko (first round)
* Marc-Andrea Hüsler (quarterfinals)
* Harold Mayot (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 | Final |
| | Rudolf Molleker | 6$^5$ | 2 | | | | | |
| Q | Antoine Bellier | 7$^7$ | 6 | | | | | |
| Q | Antoine Bellier | 7$^7$ | 6 | Q | Antoine Bellier | 7$^7$ | 6$^5$ | 7$^8$ |
| | | | | 2 | Maximilian Marterer | 6$^5$ | 7$^7$ | 6$^6$ |
| | Lukáš Klein | 4 | 4 | 2 | Maximilian Marterer | 6$^5$ | 7$^7$ | 6$^6$ |
| 2 | Maximilian Marterer | 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 |
| 1 | D Stricker | 7$^7$ | 3 | 6 | | | | | | | | | | | | | | |
| Q | J Sousa | 6$^4$ | 6 | 3 | 1 | D Stricker | 7$^7$ | 1$^r$ | | | | | | | | | | |
| | R Molleker | 7$^7$ | 4 | 6 | | R Molleker | 6$^2$ | 4 | | | | | | | | | | |
| WC | D Masur | 6$^4$ | 6 | 3 | | | | | | | R Molleker | 7 | 6$^7$ | 6 | | | | |
| Alt | M Bourgue | 6 | 6 | | | | | | | Alt | A Kachmazov | 5 | 7$^9$ | 3 | | | | |
| | O Krutykh | 3 | 0 | | Alt | M Bourgue | 7$^7$ | 3 | 3 | | | | | | | | | |
| Alt | A Kachmazov | 6 | 5 | 6 | Alt | A Kachmazov | 6$^1$ | 6 | 6 | | | | | | | | | |
| 6 | J Choinski | 4 | 7 | 2 | | | | | | | | | | | | R Molleker | 6$^5$ | 2 |
| 9 | H Mayot | 6$^1$ | 3 | | | | | | | | | | | | Q | A Bellier | 7$^7$ | 6 |
| Q | A Bellier | 7$^7$ | 6 | | Q | A Bellier | 6 | 7$^7$ | | | | | | | | | | |
| WC | M Topo | 7$^7$ | 3 | 6$^3$ | | O Otte | 4 | 6$^3$ | | | | | | | | | | |
| | O Otte | 6$^2$ | 6 | 7$^7$ | | | | | | Q | A Bellier | 6 | 6 | | | | | |
| | D Yevseyev | 3 | 4 | | | | | | | 8 | M-A Hüsler | 3 | 2 | | | | | |
| | H Squire | 6 | 6 | | | H Squire | 3 | 7 | 6$^5$ | | | | | | | | | |
| | M Poljičak | 4 | 1 | | 8 | M-A Hüsler | 6 | 5 | 7$^7$ | | | | | | | | | |
| 8 | M-A Hüsler | 6 | 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| 5 | D Džumhur | 3 | 6 | 1 | | | | | | | | | | | | | |
| | L Klein | 6 | 3 | 6 | | L Klein | 6$^0$ | 6 | 6 | | | | | | | | |
| | N Fatić | 7 | 7 | | | N Fatić | 7$^7$ | 4 | 4 | | | | | | | | |
| LL | M Copil | 5 | 5 | | | | | | | | L Klein | 6 | 6 | | | | |
| | M Valkusz | 4 | 6$^{13}$ | | | | | | | WC | MH Rehberg | 3 | 2 | | | | |
| Q | M Rosenkranz | 6 | 7$^{15}$ | | Q | M Rosenkranz | 6$^5$ | 4 | | | | | | | | | |
| WC | MH Rehberg | 6$^5$ | 6 | 7$^7$ | WC | MH Rehberg | 7$^7$ | 6 | | | | | | | | | |
| 3 | M Cressy | 7$^7$ | 4 | 6$^4$ | | | | | | | | | | | L Klein | 4 | 4 |
| 7 | V Sachko | 6 | 6$^3$ | 3 | | | | | | | | | | 2 | M Marterer | 6 | 6 |
| | Timo Stodder | 3 | 7$^7$ | 6 | | T Stodder | 6$^9$ | 3 | | | | | | | | | |
| Q | A Paulson | 6 | 6$^6$ | 6 | Q | A Paulson | 7$^{11}$ | 6 | | | | | | | | | |
| Q | L Wessels | 4 | 7$^8$ | 3 | | | | | | Q | A Paulson | 2 | 4 | | | | |
| | A Andreev | 6$^{12}$ | 4 | | | | | | | 2 | M Marterer | 6 | 6 | | | | |
| Q | K Żuk | 7$^{14}$ | 6 | | Q | K Żuk | 3 | 6$^3$ | | | | | | | | | |
| | M Geerts | 3 | 4 | | 2 | M Marterer | 6 | 7$^7$ | | | | | | | | | |
| 2 | M Marterer | 6 | 6 | | | | | | | | | | | | | | |