# 2018 Tilia Slovenia Open – Singles

Sergiy Stakhovsky was the defending champion but lost in the quarterfinals to Constant Lestienne.
Lestienne won the title after defeating Andrea Arnaboldi 6–2, 6–1 in the final.

## Seeds

* Sergiy Stakhovsky (quarterfinals)
* Dennis Novak (first round)
* Adrián Menéndez Maceiras (semifinals)
* Gianluigi Quinzi (first round)
* Salvatore Caruso (quarterfinals)
* Luca Vanni (second round)
* Nino Serdarušić (second round)
* Andrea Arnaboldi (final)

## 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 |
| | Constant Lestienne | 6 | 6 | | | | |
| | Dominik Köpfer | 3 | 2 | | | | |
| | Dominik Köpfer | 3 | 2 | | Constant Lestienne | 6 | 6 |
| | | | | 8 | Andrea Arnaboldi | 2 | 1 |
| 3 | Adrián Menéndez Maceiras | 6$^4$ | 5 | 8 | Andrea Arnaboldi | 2 | 1 |
| 8 | Andrea Arnaboldi | 7$^7$ | 7 | | | | |

### 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 | S Stakhovsky | 4 | 6 | 6 | | | | | | | | | | | | | |
| LL | Christopher Heyman | 6 | 3 | 3 | 1 | S Stakhovsky | 7$^7$ | 6 | | | | | | | | | |
| Q | A Çelikbilek | 6 | 6 | | Q | A Çelikbilek | 6$^2$ | 2 | | | | | | | | | |
| WC | Aljaž Jakob Kaplja | 0 | 1 | | | | | | | 1 | S Stakhovsky | 6 | 2 | 1 | | | |
| | C Lestienne | 6 | 6 | | | | | | | | C Lestienne | 3 | 6 | 6 | | | |
| | F Gaio | 3 | 2 | | | C Lestienne | 6 | 6 | | | | | | | | | |
| | V Šafránek | 6$^5$ | 2 | | 7 | N Serdarušić | 4 | 2 | | | | | | | | | |
| 7 | N Serdarušić | 7$^7$ | 6 | | | | | | | | | | | | C Lestienne | 6 | 6 |
| 4 | G Quinzi | 3 | 7$^7$ | 5 | | | | | | | | | | | D Köpfer | 3 | 2 |
| | GM Moroni | 6 | 6$^3$ | 7 | | GM Moroni | 6 | 6 | | | | | | | | | |
| | L Rosol | 3 | 5 | | | C İlkel | 1 | 1 | | | | | | | | | |
| | C İlkel | 6 | 7 | | | | | | | | GM Moroni | 4 | 6 | 1 | | | |
| WC | N Razboršek | 7$^7$ | 5 | 6$^4$ | | | | | | | D Köpfer | 6 | 3 | 6 | | | |
| | D Köpfer | 6$^3$ | 7 | 7$^7$ | | D Köpfer | 4 | 6 | 7 | | | | | | | | |
| | F Baldi | 7$^7$ | 3 | 4 | 6 | L Vanni | 6 | 1 | 5 | | | | | | | | |
| 6 | L Vanni | 6$^5$ | 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 Caruso | 6 | 6 | | | | | | | | | | | | | | |
| Q | A Karatsev | 3 | 3 | | 5 | S Caruso | 4 | 6 | 7 | | | | | | | | |
| Q | M Eriksson | 6 | 6$^6$ | 6 | Q | M Eriksson | 6 | 3 | 5 | | | | | | | | |
| | V Galović | 4 | 7$^8$ | 4 | | | | | | 5 | S Caruso | 2 | 5 | | | | |
| | L Miedler | 6 | 6 | | | | | | | 3 | A Menéndez Maceiras | 6 | 7 | | | | |
| Q | F Nielsen | 3 | 2 | | | L Miedler | 6 | 3 | 3 | | | | | | | | |
| | I Nedelko | 2$^r$ | | | 3 | A Menéndez Maceiras | 4 | 6 | 6 | | | | | | | | |
| 3 | A Menéndez Maceiras | 4 | | | | | | | | | | | | 3 | A Menéndez Maceiras | 6$^4$ | 5 |
| 8 | A Arnaboldi | 6 | 7$^7$ | | | | | | | | | | | 8 | A Arnaboldi | 7$^7$ | 7 |
| WC | T Kočevar-Dešman | 0 | 6$^2$ | | 8 | A Arnaboldi | 6 | 1 | 6 | | | | | | | | |
| | T Kamke | 6 | 6 | | | T Kamke | 2 | 6 | 4 | | | | | | | | |
| WC | A Radinski | 0 | 2 | | | | | | | 8 | A Arnaboldi | 6 | 6 | | | | |
| SE | P Kotov | 6 | 6 | | | | | | | | A Šetkić | 2 | 4 | | | | |
| | B Bonzi | 4 | 3 | | SE | P Kotov | 3 | 1 | | | | | | | | | |
| | A Šetkić | 6 | 6 | | | A Šetkić | 6 | 6 | | | | | | | | | |
| 2 | D Novak | 4 | 2 | | | | | | | | | | | | | | |