Stadium: Opatija 2 Round: 27 Ground: Clay
| ITF Croatia F3 | 2018/03/22 14:00 | Matteo Viola v Nik Razborsek | 7-6,6-3 |
| ITF Croatia F3 | 2018/03/21 09:00 | Matteo Viola v Sebastian Prechtel | 6-1,6-2 |
| ITF Croatia F2 | 2018/03/16 13:30 | Mate Valkusz v Matteo Viola | 0-6,6-2,6-1 |
| ITF Croatia F2 | 2018/03/15 11:25 | Cezar Cretu v Matteo Viola | 2-6,2-6 |
| ITF Croatia F2 | 2018/03/14 14:50 | Ivan Sabanov v Matteo Viola | 3-6,0-6 |
| ITF Croatia F1 | 2018/03/10 09:00 | Javier Barranco Cosano v Matteo Viola | 4-6,7-6,6-2 |
| ITF Croatia F1 | 2018/03/09 14:30 | Alexandar Lazarov v Matteo Viola | 3-6,0-6 |
| ITF Croatia F1 | 2018/03/08 12:30 | David Perez Sanz v Matteo Viola | 3-6,2-6 |
| ITF Croatia F3 | 2018/03/22 11:30 | Kai Lemstra v Deni Zmak | 6-4,1-6,4-6 |
| ITF Croatia F3 | 2018/03/21 12:20 | Deni Zmak v David Perez Sanz | 6-3,6-0 |
| ITF Croatia F3 | 2018/03/20 08:30 | Ivan Sabanov v Deni Zmak | 2-6,3-6 |
| ITF Croatia F3 | 2018/03/19 14:00 | Deni Zmak v Andres Gabriel Ciurletti | 6-2,6-2 |
| ITF Croatia F3 | 2018/03/19 11:00 | Andre Biro v Deni Zmak | 2-6,3-6 |
| ITF Croatia F2 | 2018/03/13 08:00 | Tom Kocevar-Desman v Deni Zmak | 6-3,3-6,6-4 |
| ITF Croatia F2 | 2018/03/11 08:00 | Marko Pavlovic v Deni Zmak | 0-6,1-6 |
| ITF Croatia F2 | 2018/03/10 08:00 | Dominik Kisantal v Deni Zmak | 1-6,2-6 |