| Type: | ATP Challenger |
| Tilia Slovenia Open | |
| Current: | 2018 Tilia Slovenia Open |
| Event Name: | Tilia Slovenia Open |
| Location: | Portorož, Slovenia |
| Venue: | Tennis Club Portorož (ŠRC Marina Portorož) |
| Category: | ATP Challenger Tour |
| Surface: | Hard (outdoors) |
| Draw: | 32S/16D |
| Prize Money: | €42,500 |
| Website: | Website |
The Tilia Slovenia Open is a professional tennis tournament played on outdoor hard courts in Portorož, Slovenia with 1st edition on 2013. It is currently part of the ATP Challenger Tour. It is held on courts of the Sports-Recreational center Marina Portorož at Tennis club Portorož.
| Year | Champion | Runner-up | Score | |
|---|---|---|---|---|
| Aljaž Bedene | 7–5, 6–3 | |||
 Constant Lestienne | 6–2, 6–1 | |||
 Sergiy Stakhovsky | 6–7(4–7), 7–6(8–6), 6–3 | |||
| Florian Mayer | 6–1, 6–2 | |||
 Luca Vanni | 6–3, 7–6(8–6) | |||
| Blaž Kavčič | 7–5, 6–7(4–7), 6–1 | |||
| Grega Žemlja | 6–4, 7–5 |
| Year | Champions | Runners-up | Score | |
|---|---|---|---|---|
 Teymuraz Gabashvili Carlos Gómez-Herrera | 6–3, 6–2 | |||
Gerard Granollers Lukáš Rosol | 7–5, 6–3 | |||
Hans Podlipnik Castillo Andrei Vasilevski | 6–3, 7–6(7–4) | |||
| Sergey Betov Ilya Ivashka | 1–6, 6–3, [10–4] | |||
Fabrice Martin  Purav Raja | 7–6(7–5), 4–6, [18–16] | |||
| Sergey Betov Aliaksandr Bury | 6–0, 6–3 | |||
| Marin Draganja Mate Pavić | 6–3, 1–6, [10–5] |