# 2023 Challenger Biel/Bienne – Singles

Jurij Rodionov was the defending champion and successfully defended his title after Liam Broady retired trailing 3–6, 0–0 in the final.

## Seeds

* Dominic Stricker (second round)
* Jurij Rodionov (champion)
* Norbert Gombos (quarterfinals)
* Liam Broady (final, retired)
* Otto Virtanen (quarterfinals)
* Zdeněk Kolář (first round)
* Alexander Ritschard (first round)
* Gabriel Diallo (quarterfinals)

## 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 | Marius Copil | 3 | 4 | | | | |
| 4 | Liam Broady | 6 | 6 | | | | |
| 4 | Liam Broady | 6 | 6 | 4 | Liam Broady | 3 | 0$^r$ |
| | | | | 2 | Jurij Rodionov | 6 | 0 |
| | Benjamin Hassan | 3 | 5 | 2 | Jurij Rodionov | 6 | 0 |
| 2 | Jurij Rodionov | 6 | 7 | | | | |

### 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$^7$ | 7$^7$ | | | | | | | | | | | | | | | |
| | B Zhukayev | 6$^2$ | 6$^5$ | | 1 | D Stricker | 6 | 2 | 6$^3$ | | | | | | | | | |
| Q | M Copil | 6 | 6 | | Q | M Copil | 3 | 6 | 7$^7$ | | | | | | | | | |
| | M Gengel | 4 | 3 | | | | | | | Q | M Copil | 6 | 6 | | | | | |
| LL | MH Rehberg | 6 | 6$^5$ | 6 | | | | | | WC | M Brunold | 3 | 3 | | | | | |
| | D Masur | 3 | 7$^7$ | 3 | LL | MH Rehberg | 2 | 6 | 3 | | | | | | | | | |
| WC | M Brunold | 6 | 6 | | WC | M Brunold | 6 | 3 | 6 | | | | | | | | | |
| 6 | Z Kolář | 1 | 4 | | | | | | | | | | | | Q | M Copil | 3 | 4 |
| 4 | L Broady | 6 | 6 | | | | | | | | | | | | 4 | L Broady | 6 | 6 |
| | V Durasovic | 1 | 4 | | 4 | L Broady | 6 | 7 | | | | | | | | | | |
| | O Jasika | 4 | 4 | | | M Neuchrist | 4 | 5 | | | | | | | | | | |
| | M Neuchrist | 6 | 6 | | | | | | | 4 | L Broady | 3 | 7 | 6 | | | | |
| Q | Kirill Kivattsev | 6 | 6$^5$ | 6 | | | | | | 8 | G Diallo | 6 | 5 | 3 | | | | |
| | A Lazarov | 4 | 7$^7$ | 3 | Q | K Kivattsev | 2 | 3 | | | | | | | | | | |
| WC | Dylan Dietrich | 6 | 1 | 4 | 8 | G Diallo | 6 | 6 | | | | | | | | | | |
| 8 | G Diallo | 4 | 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 7 | A Ritschard | 6$^3$ | 6 | 6$^6$ | | | | | | | | | | | | | | |
| | B Hassan | 7$^7$ | 4 | 7$^8$ | | B Hassan | 6 | 7$^7$ | | | | | | | | | | |
| | A Dougaz | 3 | 6 | 6$^8$ | PR | T-S Kwiatkowski | 4 | 6$^5$ | | | | | | | | | | |
| PR | T-S Kwiatkowski | 6 | 3 | 7$^{10}$ | | | | | | | B Hassan | 7$^7$ | 6 | | | | | |
| | A Çelikbilek | 2 | 0 | | | | | | | 3 | N Gombos | 6$^2$ | 2 | | | | | |
| | M Kukushkin | 6 | 6 | | | M Kukushkin | 6$^2$ | 6 | 2 | | | | | | | | | |
| Q | E Dalla Valle | 6 | 3 | 6$^1$ | 3 | N Gombos | 7$^7$ | 4 | 6 | | | | | | | | | |
| 3 | N Gombos | 4 | 6 | 7$^7$ | | | | | | | | | | | | B Hassan | 3 | 5 |
| 5 | O Virtanen | 6 | 6 | | | | | | | | | | | | 2 | J Rodionov | 6 | 7 |
| | J McCabe | 4 | 4 | | 5 | O Virtanen | 6 | 6 | | | | | | | | | | |
| Q | D Cukierman | 6 | 7$^7$ | | Q | D Cukierman | 2 | 3 | | | | | | | | | | |
| | A Vatutin | 4 | 6$^3$ | | | | | | | 5 | O Virtanen | 6$^4$ | 7 | 3 | | | | |
| WC | J Paul | 6$^5$ | 4 | | | | | | | 2 | J Rodionov | 7$^7$ | 5 | 6 | | | | |
| Q | F Forti | 7$^7$ | 6 | | Q | F Forti | 4 | 4 | | | | | | | | | | |
| Q | N Oberleitner | 3 | 6$^3$ | | 2 | J Rodionov | 6 | 6 | | | | | | | | | | |
| 2 | J Rodionov | 6 | 7$^7$ | | | | | | | | | | | | | | | |