# 2018 Slovak Open – Singles

Lukáš Lacko was the defending champion but lost in the second round to Egor Gerasimov.
Alexander Bublik won the title after defeating Lukáš Rosol 6–4, 6–4 in the final.

## Seeds

* Lukáš Lacko (second round)
* Evgeny Donskoy (quarterfinals)
* Lorenzo Sonego (second round)
* Guillermo García López (second round)
* Marco Trungelliti (first round)
* Ramkumar Ramanathan (second round)
* Marcos Baghdatis (second round)
* Ruben Bemelmans (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

| Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| | Lukáš Rosol | 7 | 7$^7$ | | | | |
| | Dennis Novak | 5 | 6$^1$ | | | | |
| | Dennis Novak | 5 | 6$^1$ | | Lukáš Rosol | 4 | 4 |
| | | | | Q | Alexander Bublik | 6 | 6 |
| Q | Alexander Bublik | 7 | 7$^7$ | Q | Alexander Bublik | 6 | 6 |
| | Matthias Bachinger | 5 | 6$^4$ | | | | |

### 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 |
| 1 | L Lacko | 4 | 6 | 7 | | | | | | | | | | | | | |
| | S Robert | 6 | 4 | 5 | 1 | L Lacko | 3 | 3 | | | | | | | | | |
| PR | E Gerasimov | 6 | 6 | | PR | E Gerasimov | 6 | 6 | | | | | | | | | |
| Q | D Masur | 2 | 2 | | | | | | | PR | E Gerasimov | 7$^7$ | 3 | 4 | | | |
| Q | J Härteis | 3 | 3 | | | | | | | | L Rosol | 6$^5$ | 6 | 6 | | | |
| | L Rosol | 6 | 6 | | | L Rosol | 4 | 6 | 7$^7$ | | | | | | | | |
| | R Molleker | 4 | 3 | | 8 | R Bemelmans | 6 | 3 | 6$^2$ | | | | | | | | |
| 8 | R Bemelmans | 6 | 6 | | | | | | | | | | | | L Rosol | 7 | 7$^7$ |
| 4 | G García López | 7$^7$ | 6 | | | | | | | | | | | | D Novak | 5 | 6$^1$ |
| | D Brands | 6$^5$ | 4 | | 4 | G García López | 5 | 4 | | | | | | | | | |
| | S Ofner | 6$^{11}$ | 6 | 6 | | S Ofner | 7 | 6 | | | | | | | | | |
| | A Arnaboldi | 7$^{13}$ | 3 | 4 | | | | | | | S Ofner | 1 | 6 | 3 | | | |
| | D Novak | 6 | 6 | | | | | | | | D Novak | 6 | 1 | 6 | | | |
| WC | A Molčan | 4 | 4 | | | D Novak | 6 | 6 | | | | | | | | | |
| Alt | F Horanský | 3 | 4 | | 7 | M Baghdatis | 4 | 1 | | | | | | | | | |
| 7 | M Baghdatis | 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 | M Trungelliti | 2 | 4 | | | | | | | | | | | | | | |
| | S Stakhovsky | 6 | 6 | | | S Stakhovsky | 6$^6$ | 6 | 6 | | | | | | | | |
| WC | Tomáš Líška | 2 | 1 | | WC | N Gombos | 7$^8$ | 4 | 2 | | | | | | | | |
| WC | N Gombos | 6 | 6 | | | | | | | | S Stakhovsky | 3 | 6$^5$ | | | | |
| | A Martin | 6 | 3 | 5 | | | | | | Q | A Bublik | 6 | 7$^7$ | | | | |
| Q | A Bublik | 2 | 6 | 7 | Q | A Bublik | 6 | 6 | | | | | | | | | |
| | M Donati | 3 | 2 | | 3 | L Sonego | 4 | 2 | | | | | | | | | |
| 3 | L Sonego | 6 | 6 | | | | | | | | | | | Q | A Bublik | 7 | 7$^7$ |
| 6 | R Ramanathan | 6 | 7 | | | | | | | | | | | | M Bachinger | 5 | 6$^4$ |
| | S Gutiérrez Ferrol | 3 | 5 | | 6 | R Ramanathan | 3 | 6 | 2 | | | | | | | | |
| | M Bachinger | 6 | 7$^8$ | | | M Bachinger | 6 | 3 | 6 | | | | | | | | |
| WC | L Klein | 4 | 6$^6$ | | | | | | | | M Bachinger | 6 | 7$^8$ | | | | |
| Alt | U Ignatik | 6 | 6$^1$ | 6$^6$ | | | | | | 2 | E Donskoy | 4 | 6$^6$ | | | | |
| Q | J Rodionov | 2 | 7$^7$ | 7$^8$ | Q | J Rodionov | 7$^7$ | 4 | 6$^5$ | | | | | | | | |
| | J Zopp | 6$^4$ | 2 | | 2 | E Donskoy | 6$^4$ | 6 | 7$^7$ | | | | | | | | |
| 2 | E Donskoy | 7$^7$ | 6 | | | | | | | | | | | | | | |