| Doubles | |
|---|---|
| 2018 Tilia Slovenia Open | |
| Champions | |
| Runners-up | |
| Score | 7–5, 6–3 |
Hans Podlipnik Castillo and Andrei Vasilevski were the defending champions but chose not to defend their title.
Gerard Granollers and Lukáš Rosol won the title after defeating Nikola Ćaćić and Lucas Miedler 7–5, 6–3 in the final.
Ruben Gonzales / 
Nathaniel Lammons (quarterfinals)
Franco Agamenone / 
Luis David Martínez (first round)
Andre Begemann / 
Albano Olivetti (semifinals)
Timur Khabibulin / 
Sergiy Stakhovsky (semifinals)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | 7 | 6 | |||||||||||||||||||||||||
| 5 | 3 | 1 | 3 | 5 | |||||||||||||||||||||||
| 3 | 2 | 6 | 7 | ||||||||||||||||||||||||
| 6 | 6 | 3 | 6 | [10] | |||||||||||||||||||||||
| 3 | 7 | 6 | 3 | 6 | 3 | [4] | |||||||||||||||||||||
| 5 | 4 | 3 | 4 | 6 | [10] | ||||||||||||||||||||||
| WC |  Aljaž Jakob Kaplja Robert Kjellberg | 1 | 4 | 6 | 2 | [4] | |||||||||||||||||||||
| 6 | 6 | 5 | 3 | ||||||||||||||||||||||||
| 4 | 4 | 7 | 6 | ||||||||||||||||||||||||
| 6 | 6 | 5 | 4 | ||||||||||||||||||||||||
| WC | 3 | 4 | 4 | 7 | 6 | ||||||||||||||||||||||
| 4 | 6 | 6 | 4 | 1 | 1 | ||||||||||||||||||||||
| 77 | 4 | [12] | 6 | 6 | |||||||||||||||||||||||
| WC | 64 | 6 | [10] | 4 | 4 | ||||||||||||||||||||||
| 5 | 6 | [10] | 6 | 6 | |||||||||||||||||||||||
| 2 | 7 | 2 | [4] | ||||||||||||||||||||||||
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