The 2018 Tilia Slovenia Open was a professional tennis tournament played on hard courts. It was the sixth edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Portorož, Slovenia between 6 – 11 August 2018.
| 2018 Tilia Slovenia Open | |
|---|---|
| Date | 6–11 August |
| Edition | 6th |
| Surface | Hard |
| Location | Portorož, Slovenia |
| Champions | |
| Singles | |
 Constant Lestienne | |
| Doubles | |
 Gerard Granollers /  Lukáš Rosol | |
Singles main-draw entrants edit
Seeds edit
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 UKR
|
Sergiy Stakhovsky | 117 | 1 |
 AUT
|
Dennis Novak | 136 | 2 |
| ESP
|
Adrián Menéndez Maceiras | 143 | 3 |
 ITA
|
Gianluigi Quinzi | 162 | 4 |
| ITA
|
Salvatore Caruso | 185 | 5 |
| ITA
|
Luca Vanni | 191 | 6 |
 CRO
|
Nino Serdarušić | 193 | 7 |
| ITA
|
Andrea Arnaboldi | 199 | 8 |
- 1 Rankings are as of 30 July 2018.
Other entrants edit
The following players received wildcards into the singles main draw:
Aljaž Jakob Kaplja- Tom Kočevar-Dešman
- Aljaž Radinski
- Nik Razboršek
The following player received entry into the singles main draw as a special exempt:
The following players received entry from the qualifying draw:
The following player received entry as a lucky loser:
Christopher Heyman
Champions edit
Singles edit
Constant Lestienne def. 
Andrea Arnaboldi 6–2, 6–1.
Doubles edit
Gerard Granollers / 
Lukáš Rosol def. 
Nikola Ćaćić / 
Lucas Miedler 7–5, 6–3.
