| Singles | |
|---|---|
| 2018 Tilia Slovenia Open | |
| Champion |  Constant Lestienne |
| Runner-up |  Andrea Arnaboldi |
| Score | 6–2, 6–1 |
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.
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)| Semifinals | Final | ||||||||||||
| Constant Lestienne | 6 | 6 | |||||||||||
 Dominik Köpfer | 3 | 2 | |||||||||||
| Constant Lestienne | 6 | 6 | |||||||||||
| 8 | Andrea Arnaboldi | 2 | 1 | ||||||||||
| 3 | Adrián Menéndez Maceiras | 64 | 5 | ||||||||||
| 8 | Andrea Arnaboldi | 77 | 7 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | S Stakhovsky | 4 | 6 | 6 | |||||||||||||||||||||||
| LL |  Christopher Heyman | 6 | 3 | 3 | 1 | S Stakhovsky | 77 | 6 | |||||||||||||||||||
| Q |  A Çelikbilek | 6 | 6 | Q | A Çelikbilek | 62 | 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 | 65 | 2 | 7 | N Serdarušić | 4 | 2 | |||||||||||||||||||||
| 7 | N Serdarušić | 77 | 6 | C Lestienne | 6 | 6 | |||||||||||||||||||||
| 4 | G Quinzi | 3 | 77 | 5 | D Köpfer | 3 | 2 | ||||||||||||||||||||
| GM Moroni | 6 | 63 | 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 | 77 | 5 | 64 | D Köpfer | 6 | 3 | 6 | |||||||||||||||||||
| D Köpfer | 63 | 7 | 77 | D Köpfer | 4 | 6 | 7 | ||||||||||||||||||||
| F Baldi | 77 | 3 | 4 | 6 | L Vanni | 6 | 1 | 5 | |||||||||||||||||||
| 6 | L Vanni | 65 | 6 | 6 | |||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | S Caruso | 6 | 6 | ||||||||||||||||||||||||
| Q |  A Karatsev | 3 | 3 | 5 | S Caruso | 4 | 6 | 7 | |||||||||||||||||||
| Q |  M Eriksson | 6 | 66 | 6 | Q | M Eriksson | 6 | 3 | 5 | ||||||||||||||||||
| V Galović | 4 | 78 | 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 | 2r | 3 | A Menéndez Maceiras | 4 | 6 | 6 | |||||||||||||||||||||
| 3 | A Menéndez Maceiras | 4 | 3 | A Menéndez Maceiras | 64 | 5 | |||||||||||||||||||||
| 8 | A Arnaboldi | 6 | 77 | 8 | A Arnaboldi | 77 | 7 | ||||||||||||||||||||
| WC | T Kočevar-Dešman | 0 | 62 | 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 | ||||||||||||||||||||||||
Marcos Baghdatis was the defending champion, but chose not to participate that year.
Sergiy Stakhovsky was the defending champion, but lost in the first round to Benjamin Becker.
Mikhail Kukushkin defeated 1st seed Mikhail Youzhny 6–3, 7–6(7–2) to win this tournament.
João Sousa was the defending champion.
Blaž Kavčič won the tournament by defeating Sergiy Stakhovsky 6–3, 2–6, 6–2 in the final.
Roger Federer was the defending champion, but lost in the quarterfinals to Julien Benneteau.
Juan Martín del Potro won the title, defeating Benneteau in the final 7–6(7–2), 6–3.
Juan Martín del Potro was the defending champion, but lost to Gilles Simon in the quarterfinals.
Jo-Wilfried Tsonga won the title, defeating Tomáš Berdych in the final, 3–6, 7–6(8–6), 6–4.
Philipp Kohlschreiber was the defending champion but lost in the final to Tommy Haas, 3–6, 6–7(3–7).
Nicolás Almagro was the two-time defending champion but decided not to participate.
Albert Montañés won the title, defeating Gaël Monfils in the final, 6–0, 7–6.(7–3)
Pablo Cuevas was the defending champion. He lost his title in the semifinals to Benoît Paire. Paire went on to win the title, defeating Tommy Robredo in the final, 7–6(9–7), 6–3.
Viktor Troicki was the defending champion and successfully defended his title, defeating Grigor Dimitrov in the final, 2–6, 6–1, 7–6(9–7).
Roger Federer was the three-time defending champion, but lost in the semifinals to Alexander Zverev.
Jaume Munar was the defending champion but chose not to defend his title.
Adrián Menéndez Maceiras and Sergiy Stakhovsky were the defending champions but withdrew before their quarterfinal match.
Peter Gojowczyk was the defending champion, but lost to Kei Nishikori in the second round.
Jo-Wilfried Tsonga was the defending champion, but lost in the second round to Gaël Monfils.
Vasek Pospisil was the defending champion but chose not to defend his title.
Quentin Halys was the defending champion but lost in the second round to Dan Evans.
Karen Khachanov was the defending champion, but withdrew before the tournament began.
Constant Lestienne was the defending champion but lost in the semifinals to Viktor Durasovic.
Ričardas Berankis was the defending champion but chose not to defend his title.
This was the first edition of the tournament.