# 2019 Sibiu Open – Singles

Dragoș Dima was the defending champion but lost in the first round to Václav Šafránek.
Danilo Petrović won the title after defeating Christopher O'Connell 6–4, 6–2 in the final.

## Seeds

All seeds receive a bye into the second round.
* Pedro Sousa (third round)
* Blaž Rola (quarterfinals)
* Attila Balázs (withdrew)
* Pedro Martínez (second round)
* Nikola Milojević (second round)
* Federico Coria (third round)
* Robin Haase (second round)
* Rudolf Molleker (second round)
* João Domingues (second round)
* Facundo Argüello (second round)
* Tallon Griekspoor (second round)
* Filip Horanský (second round)
* Dmitry Popko (second round)
* Christopher O'Connell (final)
* Peđa Krstin (third round)
* Bernabé Zapata Miralles (second 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

| Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 14 | Christopher O'Connell | 7 | 6 | | | | | | | | | | |
| | Vít Kopřiva | 5 | 3 | | | | | | | | | | |
| | Vít Kopřiva | 5 | 3 | | 14 | Christopher O'Connell | 4 | 6 | 6 | | | | |
| | | | | | | Jelle Sels | 6 | 4 | 2 | | | | |
| | Jelle Sels | 6 | 6 | | | Jelle Sels | 6 | 4 | 2 | | | | |
| | Václav Šafránek | 2 | 2 | | | | | | | | | | |
| | Václav Šafránek | 2 | 2 | | | | | | | 14 | Christopher O'Connell | 4 | 2 |
| | | | | | | | | | | | Danilo Petrović | 6 | 6 |
| | Danilo Petrović | 6 | 7$^7$ | | | | | | | | | | | Danilo Petrović | 6 | 6 |
| | Laurent Lokoli | 4 | 6$^3$ | | | | | | | | | | |
| | Laurent Lokoli | 4 | 6$^3$ | | | Danilo Petrović | 6 | 6 | | | | | |
| | | | | | | Alex Molčan | 3 | 3 | | | | | |
| | Alex Molčan | 6 | 6$^4$ | 6 | | Alex Molčan | 3 | 3 | | | | | |
| 2 | Blaž Rola | 4 | 7$^7$ | 4 | | | | | | | | | |

### Top half
#### Section 1

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 1 | P Sousa | 6 | 6 | | | | | | | | | | |
| Alt | Pavel Nejedlý | 6 | 3 | 3 | Alt | P Nouza | 3 | 1 | | | | | | | | | | |
| Alt | P Nouza | 3 | 6 | 6 | | | | | | 1 | P Sousa | 4 | 1 | | | | | |
| | A Pavlásek | 3 | 4 | | | | | | | 14 | C O'Connell | 6 | 6 | | | | | |
| | M Hamou | 6 | 6 | | | M Hamou | 7$^7$ | 6$^4$ | 2 | | | | | | | | | |
| | | | | | 14 | C O'Connell | 6$^3$ | 7$^7$ | 6 | | | | | | | | | |
| | | | | | | | | | | | | | | | 14 | C O'Connell | 7 | 6 |
| | | | | | | | | | | | | | | | | V Kopřiva | 5 | 3 |
| | | | | | 10 | F Argüello | 5 | 1 | | | | | | | | | | |
| | V Kopřiva | 6 | 7$^7$ | | | V Kopřiva | 7 | 6 | | | | | | | | | | |
| | P Torebko | 2 | 6$^4$ | | | | | | | | V Kopřiva | 5 | 6 | 7 | | | | |
| | J Barranco Cosano | 3 | 6 | 7 | | | | | | 6 | F Coria | 7 | 2 | 5 | | | | |
| | Fabrizio Ornago | 6 | 3 | 5 | | J Barranco Cosano | 1 | 2 | | | | | | | | | | |
| | | | | | 6 | F Coria | 6 | 6 | | | | | | | | | | |

#### Section 2

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | 4 | P Martínez | 4 | 2 | | | | | | |
| | J Sels | 7 | 6 | | J Sels | 6 | 6 | | | | | | |
| Q | J Pospíšil | 5 | 3 | | | | | J Sels | 6 | 6 | | | |
| | S Doumbia | 4 | 2 | | | | | Z Kolář | 4 | 4 | | | |
| | Z Kolář | 6 | 6 | | Z Kolář | 6 | 6 | | | | | | |
| | | | | 13 | D Popko | 1 | 2 | | | | | | |
| | | | | | | | | | | | J Sels | 6 | 6 |
| | | | | | | | | | | | V Šafránek | 2 | 2 |
| | | | | 11 | T Griekspoor | 3 | 4 | | | | | | |
| | J Zopp | 2 | 6$^3$ | | N Serdarušić | 6 | 6 | | | | | | |
| | N Serdarušić | 6 | 7$^7$ | | | | | N Serdarušić | 1 | 2 | | | |
| | D Dima | 2 | 4 | | | | | V Šafránek | 6 | 6 | | | |
| | V Šafránek | 6 | 6 | | V Šafránek | 6 | 6 | | | | | | |
| | | | | 8 | R Molleker | 3 | 4 | | | | | | |

### Bottom half
#### Section 3

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | 7 | R Haase | 3 | 2 | | | | | | |
| | U Ignatik | 6$^7$ | 4 | | D Petrović | 6 | 6 | | | | | | |
| | D Petrović | 7$^9$ | 6 | | | | | D Petrović | 7$^7$ | 6 | | | |
| | Jules Okala | 1 | 3 | | | | | JP Varillas | 6$^4$ | 3 | | | |
| | JP Varillas | 6 | 6 | | JP Varillas | 6 | 6 | | | | | | |
| | | | | 9 | J Domingues | 3 | 3 | | | | | | |
| | | | | | | | | | | | D Petrović | 6 | 7$^7$ |
| | | | | | | | | | | | L Lokoli | 4 | 6$^3$ |
| | | | | 16 | B Zapata Miralles | 2 | 4 | | | | | | |
| | P Toledo Bagué | 2 | 1 | | N Sánchez Izquierdo | 6 | 6 | | | | | | |
| | N Sánchez Izquierdo | 6 | 6 | | | | | N Sánchez Izquierdo | 4 | 5 | | | |
| WC | A Bodmer | 5 | 3 | | | | | L Lokoli | 6 | 7 | | | |
| | L Lokoli | 7 | 6 | | L Lokoli | 6 | 6 | | | | | | |
| | | | | LL | S Martos Gornés | 1 | 2 | | | | | | |

#### Section 4

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 5 | N Milojević | 7 | 1 | 3 | | | | | | | | | | |
| | A Molčan | 6 | 7$^7$ | | | A Molčan | 5 | 6 | 6 | | | | | | | | | | |
| WC | VV Cornea | 1 | 6$^5$ | | | | | | | | A Molčan | 2 | 6 | 7$^7$ | | | | | |
| Q | M Sabanov | 4 | 2 | | | | | | | WC | FC Jianu | 6 | 4 | 6$^4$ | | | | | |
| WC | FC Jianu | 6 | 6 | | WC | FC Jianu | 7$^7$ | 6 | | | | | | | | | | | |
| | | | | | 12 | F Horanský | 6$^3$ | 3 | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | A Molčan | 6 | 6$^4$ | 6 |
| | | | | | | | | | | | | | | | 2 | B Rola | 4 | 7$^7$ | 4 |
| | | | | | 15 | P Krstin | 6 | 6 | | | | | | | | | | | |
| WC | A Jecan | 6 | 4 | 3 | WC | M Dembek | 4 | 2 | | | | | | | | | | | |
| WC | Michał Dembek | 2 | 6 | 6 | | | | | | 15 | P Krstin | 1 | 6 | 1 | | | | | |
| | C Taberner | 6 | 4 | 2 | | | | | | 2 | B Rola | 6 | 3 | 6 | | | | | |
| Alt | F Reboul | 0 | 6 | 6 | Alt | F Reboul | 3 | 6 | 3 | | | | | | | | | | |
| | | | | | 2 | B Rola | 6 | 4 | 6 | | | | | | | | | | |