# 2023 Sibiu Open – Singles

Nerman Fatić was the defending champion and successfully defended his title after defeating Damir Džumhur 6–2, 6–4 in the final.

## Seeds

* Zsombor Piros (semifinals)
* Flavio Cobolli (semifinals)
* Damir Džumhur (final)
* Ivan Gakhov (quarterfinals)
* Stefano Travaglia (quarterfinals)
* Duje Ajduković (quarterfinals)
* Alessandro Giannessi (first round, retired)
* Nerman Fatić (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 | 2 | 6 | 1 | | | | |
| 8 | Nerman Fatić | 6 | 1 | 6 | | | | |
| 8 | Nerman Fatić | 6 | 1 | 6 | 8 | Nerman Fatić | 6 | 6 |
| | | | | | 3 | Damir Džumhur | 2 | 4 |
| 3 | Damir Džumhur | 7 | 6 | | 3 | Damir Džumhur | 2 | 4 |
| 2 | Flavio Cobolli | 5 | 4 | | | | | |

### 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 | 6 | 6 | | | | | | | | | | | | | | | | |
| | N Sánchez Izquierdo | 3 | 3 | | 1 | Z Piros | 6 | 6 | | | | | | | | | | | |
| Q | A Paulson | 6 | 6 | | Q | A Paulson | 3 | 4 | | | | | | | | | | | |
| | N Serdarušić | 2 | 1 | | | | | | | 1 | Z Piros | 6 | 4 | 6 | | | | | |
| Q | C Hemery | 6 | 6 | | | | | | | Q | C Hemery | 3 | 6 | 1 | | | | | |
| | M Valkusz | 1 | 1 | | Q | C Hemery | 6 | 6 | | | | | | | | | | | |
| WC | B Artnak | 3 | | | WC | B Artnak | 4 | 2 | | | | | | | | | | | |
| 7 | A Giannessi | 0$^r$ | | | | | | | | | | | | | 1 | Z Piros | 2 | 6 | 1 |
| 4 | I Gakhov | 6 | 4 | 7 | | | | | | | | | | | 8 | N Fatić | 6 | 1 | 6 |
| | C Tabur | 1 | 6 | 5 | 4 | I Gakhov | 7$^7$ | 6$^1$ | 7$^7$ | | | | | | | | | | |
| | Alexander Weis | 6 | 4 | 6 | | A Weis | 6$^5$ | 7$^7$ | 6$^5$ | | | | | | | | | | |
| Q | M Vrbenský | 4 | 6 | 2 | | | | | | 4 | I Gakhov | 1 | 6 | 2 | | | | | |
| | S Diez | 2 | 5 | | | | | | | 8 | N Fatić | 6 | 2 | 6 | | | | | |
| | R Bonadio | 6 | 7 | | | R Bonadio | 7 | 6$^7$ | 4 | | | | | | | | | | |
| Q | Vlad Andrei Dancu | 4 | 4 | | 8 | N Fatić | 5 | 7$^9$ | 6 | | | | | | | | | | |
| 8 | N Fatić | 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 | S Travaglia | 7$^7$ | 6 | | | | | | | | | | | | | | |
| WC | Sebastian Gima | 6$^2$ | 3 | | 5 | S Travaglia | 7 | 6 | | | | | | | | | |
| | C Taberner | 6$^4$ | 2 | | | G Blancaneaux | 5 | 3 | | | | | | | | | |
| | G Blancaneaux | 7$^7$ | 6 | | | | | | | 5 | S Travaglia | 4 | 4 | | | | |
| Q | H Laaksonen | 6 | 0 | 2 | | | | | | 3 | D Džumhur | 6 | 6 | | | | |
| | M Echargui | 2 | 6 | 6 | | M Echargui | 4 | 1 | | | | | | | | | |
| | ND Ionel | 3 | 6$^2$ | | 3 | D Džumhur | 6 | 6 | | | | | | | | | |
| 3 | D Džumhur | 6 | 7$^7$ | | | | | | | | | | | 3 | D Džumhur | 7 | 6 |
| 6 | D Ajduković | 3 | 6 | 6 | | | | | | | | | | 2 | F Cobolli | 5 | 4 |
| | F Maestrelli | 6 | 3 | 4 | 6 | D Ajduković | 4 | 6 | 6 | | | | | | | | |
| | G Fonio | 7$^7$ | 6 | | | G Fonio | 6 | 3 | 2 | | | | | | | | |
| WC | C Crețu | 6$^1$ | 3 | | | | | | | 6 | D Ajduković | 2 | 3 | | | | |
| Q | FC Jianu | 6$^4$ | 4 | | | | | | | 2 | F Cobolli | 6 | 6 | | | | |
| | Edoardo Lavagno | 7$^7$ | 6 | | | E Lavagno | 5 | 2 | | | | | | | | | |
| | S Caruso | 7$^7$ | 4 | 4 | 2 | F Cobolli | 7 | 6 | | | | | | | | | |
| 2 | F Cobolli | 6$^5$ | 6 | 6 | | | | | | | | | | | | | |