# 2018 Diema Xtra Sofia Open – Singles

Grigor Dimitrov was the defending champion, but withdrew before the tournament because of a shoulder injury.
Mirza Bašić won his first ATP title, defeating Marius Copil in the final, 7–6$^{(8–6)}$, 6–7$^{(4–7)}$, 6–4.

## Seeds

The top four seeds receive a bye into the second round.
* Stan Wawrinka (semifinals)
* Adrian Mannarino (second round)
* Gilles Müller (quarterfinals)
* Philipp Kohlschreiber (second round)
* Robin Haase (first round)
* Viktor Troicki (quarterfinals)
* João Sousa (second round)
* Evgeny Donskoy (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 | Final | Final | Final | Final | Final |
| 1 | Stan Wawrinka | 6$^6$ | 4 | | | | | |
| Q | Mirza Bašić | 7$^8$ | 6 | | | | | |
| Q | Mirza Bašić | 7$^8$ | 6 | Q | Mirza Bašić | 7$^8$ | 6$^4$ | 6 |
| | | | | | Marius Copil | 6$^6$ | 7$^7$ | 4 |
| | Marius Copil | 6 | 6 | | Marius Copil | 6$^6$ | 7$^7$ | 4 |
| Q | Jozef Kovalík | 4 | 2 | | | | | |

### 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 Wawrinka | 4 | 6 | 6 | | | | | | | | | |
| Q | M Kližan | 7 | 6 | | Q | M Kližan | 6 | 2 | 3 | | | | | | | | | |
| WC | A Donski | 5 | 1 | | | | | | | 1 | S Wawrinka | 6 | 7$^7$ | | | | | |
| WC | A Andreev | 3 | 4 | | | | | | | 6 | V Troicki | 1 | 6$^3$ | | | | | |
| | D Istomin | 6 | 6 | | | D Istomin | 6$^4$ | 6 | 6$^5$ | | | | | | | | | |
| Q | E Gulbis | 3 | 7$^7$ | 3 | 6 | V Troicki | 7$^7$ | 1 | 7$^7$ | | | | | | | | | |
| 6 | V Troicki | 6 | 6$^2$ | 6 | | | | | | | | | | | 1 | S Wawrinka | 6$^6$ | 4 |
| | | | | | | | | | | | | | | | Q | M Bašić | 7$^8$ | 6 |
| | | | | | 4 | P Kohlschreiber | 5 | 6$^5$ | | | | | | | | | | |
| LL | F Mayer | 4 | 1 | | Q | M Bašić | 7 | 7$^7$ | | | | | | | | | | |
| Q | M Bašić | 6 | 6 | | | | | | | Q | M Bašić | 6 | 4 | 6 | | | | |
| | M Marterer | 7$^7$ | 6 | | | | | | | | M Marterer | 4 | 6 | 3 | | | | |
| | M Jaziri | 6$^3$ | 4 | | | M Marterer | 7 | 7$^8$ | | | | | | | | | | |
| WC | D Kuzmanov | 6$^6$ | 1 | | 7 | J Sousa | 5 | 6$^6$ | | | | | | | | | | |
| 7 | J Sousa | 7$^8$ | 6 | | | | | | | | | | | | | | | |

### Bottom half

| 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 | R Haase | 6$^5$ | 4 | | | | | | | | | | | | | |
| | M Copil | 7$^7$ | 6 | | M Copil | 6 | 6 | | | | | | | | | |
| | L Đere | 4 | 4 | | B Kavčič | 2 | 2 | | | | | | | | | |
| | B Kavčič | 6 | 6 | | | | | | | M Copil | 6 | 6 | | | | |
| | M Youzhny | 3 | 4 | | | | | | 3 | G Müller | 4 | 4 | | | | |
| | A Seppi | 6 | 6 | | A Seppi | 6 | 6$^5$ | 6$^2$ | | | | | | | | |
| | | | | 3 | G Müller | 4 | 7$^7$ | 7$^7$ | | | | | | | | |
| | | | | | | | | | | | | | | M Copil | 6 | 6 |
| 8 | E Donskoy | 4 | 4 | | | | | | | | | | Q | J Kovalík | 4 | 2 |
| | L Lacko | 6 | 6 | | L Lacko | 6 | 2 | 5 | | | | | | | | |
| Q | J Kovalík | 6 | 6 | Q | J Kovalík | 4 | 6 | 7 | | | | | | | | |
| | R Albot | 3 | 3 | | | | | | Q | J Kovalík | 7$^7$ | 6 | | | | |
| | M Baghdatis | 7$^7$ | 6 | | | | | | | M Baghdatis | 6$^2$ | 4 | | | | |
| LL | S Caruso | 6$^4$ | 3 | | M Baghdatis | 6$^4$ | 6 | 6 | | | | | | | | |
| | | | | 2 | A Mannarino | 7$^7$ | 3 | 1 | | | | | | | | |

## Qualifying
### Seeds

* Florian Mayer (qualifying competition, lucky loser)
* Mirza Bašić (qualified)
* Oscar Otte (qualifying competition)
* Martin Kližan (qualified)
* Mats Moraing (first round)
* Lorenzo Sonego (first round)
* Salvatore Caruso (qualifying competition, lucky loser)
* Jozef Kovalík (qualified)

### Qualifiers

* Ernests Gulbis
* Mirza Bašić
* Jozef Kovalík
* Martin Kližan

### Lucky losers

* Florian Mayer
* Salvatore Caruso

### Qualifying draw
#### First qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 1 | Florian Mayer | 7$^7$ | 7$^7$ | | | | | |
| | John-Patrick Smith | 6$^5$ | 6$^1$ | | | | | |
| | John-Patrick Smith | 6$^5$ | 6$^1$ | | 1 | Florian Mayer | 4 | 1 |
| | | | | | | Ernests Gulbis | 6 | 6 |
| | Ernests Gulbis | 6$^5$ | 7$^7$ | 7$^7$ | | Ernests Gulbis | 6 | 6 |
| 6 | Lorenzo Sonego | 7$^7$ | 6$^2$ | 6$^2$ | | | | |

#### Second qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 2 | Mirza Bašić | 6$^2$ | 7$^7$ | 6 | | | | |
| WC | Alexandar Lazov | 7$^7$ | 6$^3$ | 4 | | | | |
| WC | Alexandar Lazov | 7$^7$ | 6$^3$ | 4 | 2 | Mirza Bašić | 7 | 6 |
| | | | | | | Tomislav Brkić | 5 | 4 |
| | Tomislav Brkić | 5 | 6 | 7$^7$ | | Tomislav Brkić | 5 | 4 |
| 5 | Mats Moraing | 7 | 3 | 6$^4$ | | | | |

#### Third qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 3 | Oscar Otte | 6$^3$ | 7 | 6 | | | | |
| WC | Alexandar Lazarov | 7$^7$ | 5 | 1 | | | | |
| WC | Alexandar Lazarov | 7$^7$ | 5 | 1 | 3 | Oscar Otte | 3 | 3 |
| | | | | | 8 | Jozef Kovalík | 6 | 6 |
| | Stefano Napolitano | 6 | 4 | 3 | 8 | Jozef Kovalík | 6 | 6 |
| 8 | Jozef Kovalík | 4 | 6 | 6 | | | | |

#### Fourth qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 4 | Martin Kližan | 6 | 6 | | | | | |
| | Tobias Kamke | 4 | 3 | | | | | |
| | Tobias Kamke | 4 | 3 | 4 | Martin Kližan | 1 | 6 | 6 |
| | | | | 7 | Salvatore Caruso | 6 | 4 | 3 |
| | Luca Vanni | 6$^2$ | 3 | 7 | Salvatore Caruso | 6 | 4 | 3 |
| 7 | Salvatore Caruso | 7$^7$ | 6 | | | | | |