The 2013 Tilia Slovenia Open is a professional tennis tournament played on hard courts. It was the 1st edition of the tournament which was part of the 2013 ATP Challenger Tour. It took place in Portorož, Slovenia between 1 and 7 July 2013.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Grega Žemlja | 55 | 1 | ||
 Russian Federation | Evgeny Donskoy | 66 | 2 | |
| Aljaž Bedene | 90 | 3 | ||
| Blaž Kavčič | 132 | 4 | ||
 Italy | Matteo Viola | 139 | 5 | |
| Italy | Flavio Cipolla | 152 | 6 | |
 Belarus | Uladzimir Ignatik | 162 | 7 | |
 France | Stéphane Robert | 165 | 8 |
The following players received wildcards into the singles main draw:
Stepan KhotulevThe following players received entry from the qualifying draw:
Erik Crepaldi
Frank DancevicThe following player received entry as a lucky loser:
| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
| Marin Draganja | Mate Pavić | 209 | 1 | |||
 Brazil | Marcelo Demoliner |  Austria | Maximilian Neuchrist | 409 | 2 | |
 Slovakia | Karol Beck | Belarus | Uladzimir Ignatik | 430 | 3 | |
| Italy | Flavio Cipolla | Italy | Matteo Viola | 438 | 4 |
The following pairs received wildcards into the doubles main draw:
The following pair received entry as an alternate:
See main article: 2013 Tilia Slovenia Open – Singles.
Martin Fischer 6–4, 7–5See main article: 2013 Tilia Slovenia Open – Doubles.