# 2023 Istanbul Challenger – Singles

Radu Albot was the defending champion but chose not to defend his title.
Damir Džumhur won the title after defeating Lukáš Klein 7–6$^{(7–5)}$, 6–3 in the final.

## Seeds

* Kwon Soon-woo (first round)
* Jesper de Jong (semifinals)
* Lukáš Klein (final)
* Dino Prižmić (quarterfinals)
* Gauthier Onclin (first round)
* Harold Mayot (second round)
* Damir Džumhur (champion)
* Norbert Gombos (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 |
| | Nick Hardt | 4 | 3 | | | | | |
| 7 | Damir Džumhur | 6 | 6 | | | | | |
| 7 | Damir Džumhur | 6 | 6 | | 7 | Damir Džumhur | 7$^7$ | 6 |
| | | | | | 3 | Lukáš Klein | 6$^5$ | 3 |
| 3 | Lukáš Klein | 7$^7$ | 6$^2$ | 7$^7$ | 3 | Lukáš Klein | 6$^5$ | 3 |
| 2 | Jesper de Jong | 6$^2$ | 7$^7$ | 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 |
| 1 | S-w Kwon | 0 | 1 | | | | | | | | | | | | | | | |
| | N Hardt | 6 | 6 | | | N Hardt | 6 | 3 | 7$^8$ | | | | | | | | | |
| | S Mansouri | 3 | 4 | | | B Tomic | 2 | 6 | 6$^6$ | | | | | | | | | |
| | B Tomic | 6 | 6 | | | | | | | | N Hardt | 1 | 7$^7$ | 4 | | | | |
| | M Copil | 2 | 4 | | | | | | | | A Çelikbilek | 6 | 6$^5$ | 1$^r$ | | | | |
| Q | Y Oliel | 6 | 6 | | Q | Y Oliel | 6 | 4 | 3 | | | | | | | | | |
| | A Çelikbilek | 6 | 6 | | | A Çelikbilek | 2 | 6 | 6 | | | | | | | | | |
| 5 | G Onclin | 1 | 0 | | | | | | | | | | | | | N Hardt | 4 | 3 |
| 4 | D Prižmić | 6 | 6$^3$ | 7 | | | | | | | | | | | 7 | D Džumhur | 6 | 6 |
| | L Wessels | 2 | 7$^7$ | 5 | 4 | D Prižmić | 4 | 6 | 6 | | | | | | | | | |
| Q | B Bicknell | 6$^5$ | 7$^7$ | 6 | Q | B Bicknell | 6 | 3 | 2 | | | | | | | | | |
| | M Martineau | 7$^7$ | 6$^3$ | 3 | | | | | | 4 | D Prižmić | 3 | 7$^7$ | 5 | | | | |
| | Y Erel | 6 | 1 | | | | | | | 7 | D Džumhur | 6 | 6$^3$ | 7 | | | | |
| Q | D Cukierman | 2 | 0$^r$ | | | Y Erel | 5 | 3 | | | | | | | | | | |
| WC | Tuncay Duran | 4 | 1 | | 7 | D Džumhur | 7 | 6 | | | | | | | | | | |
| 7 | D Džumhur | 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 | Semifinals |
| 8 | N Gombos | 6 | 1 | 2 | | | | | | | | | | | | | | | |
| | D Yevseyev | 4 | 6 | 6 | | D Yevseyev | 6 | 7$^7$ | | | | | | | | | | | |
| Q | L Borg | 1 | 6 | 3 | WC | K Kırcı | 2 | 6$^4$ | | | | | | | | | | | |
| WC | K Kırcı | 6 | 3 | 6 | | | | | | | D Yevseyev | 6$^5$ | 7$^7$ | 6$^2$ | | | | | |
| | M Gengel | 1 | 2 | | | | | | | 3 | L Klein | 7$^7$ | 6$^3$ | 7$^7$ | | | | | |
| WC | E Kırkın | 6 | 6 | | WC | E Kırkın | 3 | 4 | | | | | | | | | | | |
| Q | M Damm | 4 | 6 | 5 | 3 | L Klein | 6 | 6 | | | | | | | | | | | |
| 3 | L Klein | 6 | 4 | 7 | | | | | | | | | | | 3 | L Klein | 7$^7$ | 6$^2$ | 7$^7$ |
| 6 | H Mayot | 7$^7$ | 7 | | | | | | | | | | | | 2 | J de Jong | 6$^2$ | 7$^7$ | 6$^5$ |
| | A Dougaz | 6$^4$ | 5 | | 6 | H Mayot | 7$^7$ | 3 | 3 | | | | | | | | | | |
| | C İlkel | 5 | 4 | | | G Mpetshi Perricard | 6$^1$ | 6 | 6 | | | | | | | | | | |
| | G Mpetshi Perricard | 7 | 6 | | | | | | | | G Mpetshi Perricard | 5 | 4 | | | | | | |
| | J Monday | 4 | 6 | 6 | | | | | | 2 | J de Jong | 7 | 6 | | | | | | |
| | K Żuk | 6 | 1 | 4 | | J Monday | 5 | 1 | | | | | | | | | | | |
| Q | M İlhan | 2 | 7$^7$ | 2 | 2 | J de Jong | 7 | 6 | | | | | | | | | | | |
| 2 | J de Jong | 6 | 6$^3$ | 6 | | | | | | | | | | | | | | | |