2018 Tilia Slovenia Open

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.

Seeds

 * 1 Rankings are as of 30 July 2018.

Other entrants
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:
 * 🇷🇺 Pavel Kotov

The following players received entry from the qualifying draw:
 * 🇹🇷 Altuğ Çelikbilek
 * 🇸🇪 Markus Eriksson
 * 🇷🇺 Aslan Karatsev
 * Frederik Nielsen

The following player received entry as a lucky loser:
 * 🇧🇪 Christopher Heyman

Singles

 * 🇫🇷 Constant Lestienne def. 🇮🇹 Andrea Arnaboldi 6–2, 6–1.

Doubles

 * 🇪🇸 Gerard Granollers / 🇨🇿 Lukáš Rosol def. 🇷🇸 Nikola Ćaćić / 🇦🇹 Lucas Miedler 7–5, 6–3.