# 2018 Sibiu Open – Singles

Cedrik-Marcel Stebe was the defending champion but chose not to defend his title.
Dragoș Dima won the title after defeating Jelle Sels 6–3, 6–2 in the final.

## Seeds

* Laslo Đere (semifinals, retired)
* Dennis Novak (first round)
* Pedro Sousa (quarterfinals)
* Simone Bolelli (second round)
* Marc Polmans (second round)
* Gianluigi Quinzi (first round, retired)
* Pedro Martínez (semifinals)
* Lukáš Rosol (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 |
| 1 | Laslo Đere | 1$^r$ | | | | | |
| Q | Jelle Sels | 0 | | | | | |
| Q | Jelle Sels | 0 | | Q | Jelle Sels | 3 | 2 |
| | | | | WC | Dragoș Dima | 6 | 6 |
| 7 | Pedro Martínez | 4 | 2 | WC | Dragoș Dima | 6 | 6 |
| WC | Dragoș Dima | 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 |
| 1 | L Đere | 7$^9$ | 7 | | | | | | | | | | | | | | |
| | D Kuzmanov | 6$^7$ | 5 | | 1 | L Đere | 4 | 6 | 6 | | | | | | | | |
| Alt | A Šetkić | 5 | 2 | | | K Krawietz | 6 | 2 | 2 | | | | | | | | |
| | K Krawietz | 7 | 6 | | | | | | | 1 | L Đere | 3 | 6 | 6 | | | |
| | M Viola | 2 | 7$^7$ | 1 | | | | | | 8 | L Rosol | 6 | 4 | 0 | | | |
| | N Serdarušić | 6 | 6$^0$ | 6 | | N Serdarušić | 1$^r$ | | | | | | | | | | |
| | G Oliveira | 6$^6$ | 3 | | 8 | L Rosol | 2 | | | | | | | | | | |
| 8 | L Rosol | 7$^8$ | 6 | | | | | | | | | | | | 1 | L Đere | 1$^r$ |
| 4 | S Bolelli | 6 | 6 | | | | | | | | | | | | Q | J Sels | 0 |
| Q | Jeremy Jahn | 4 | 4 | | 4 | S Bolelli | 6$^2$ | 3 | | | | | | | | | |
| Q | J Sels | 7$^7$ | 6 | | Q | J Sels | 7$^7$ | 6 | | | | | | | | | |
| | C Gómez-Herrera | 6$^4$ | 3 | | | | | | | Q | J Sels | 3 | 6 | 6 | | | |
| WC | Michał Dembek | 5 | 3 | | | | | | | LL | J Barranco Cosano | 6 | 2 | 4 | | | |
| | Z Kolář | 7 | 6 | | | Z Kolář | 4 | 4 | | | | | | | | | |
| LL | J Barranco Cosano | 7$^7$ | 0 | | LL | J Barranco Cosano | 6 | 6 | | | | | | | | | |
| 6 | G Quinzi | 6$^3$ | 0$^r$ | | | | | | | | | | | | | | |

### 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 | P Martínez | 7$^7$ | 0 | | | | | | | | | | | | | | | |
| Q | N Frunză | 6$^5$ | 0$^r$ | | 7 | P Martínez | 6 | 6 | | | | | | | | | | |
| Q | Fabrizio Ornago | 3 | 6 | 7$^7$ | Q | F Ornago | 4 | 4 | | | | | | | | | | |
| WC | A Ungur | 6 | 3 | 6$^2$ | | | | | | 7 | P Martínez | 6 | 6$^2$ | 6 | | | | |
| | F Horanský | 6 | 5 | 4 | | | | | | 3 | P Sousa | 4 | 7$^7$ | 2 | | | | |
| | K Coppejans | 2 | 7 | 6 | | K Coppejans | 2 | 4 | | | | | | | | | | |
| | S Nagal | 2 | 4 | | 3 | P Sousa | 6 | 6 | | | | | | | | | | |
| 3 | P Sousa | 6 | 6 | | | | | | | | | | | | 7 | P Martínez | 4 | 2 |
| 5 | M Polmans | 7 | 2 | 6 | | | | | | | | | | | WC | D Dima | 6 | 6 |
| | S Ofner | 5 | 6 | 3 | 5 | M Polmans | 3 | 4 | | | | | | | | | | |
| | K Majchrzak | 3 | | | | K Majchrzak | 6 | 6 | | | | | | | | | | |
| | G Mager | 0$^r$ | | | | | | | | | K Majchrzak | 6 | 6$^5$ | 3 | | | | |
| WC | VV Cornea | 3 | 6 | 0 | | | | | | WC | D Dima | 0 | 7$^7$ | 6 | | | | |
| | J Domingues | 6 | 3 | 6 | | J Domingues | 6 | 6$^7$ | 4 | | | | | | | | | |
| WC | D Dima | 6 | 6 | | WC | D Dima | 3 | 7$^9$ | 6 | | | | | | | | | |
| 2 | D Novak | 2 | 1 | | | | | | | | | | | | | | | |