Stadium: Opatija 3 Round: 26 Ground: Clay
| 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 |
| Challenger Bergamo | 2018/02/21 19:30 | Matteo Berrettini v Matteo Viola | 6-3,6-1 |
| ITF Croatia F3 | 2018/03/21 10:30 | Tommaso Gabrieli v Nik Razborsek | 3-6,3-6 |
| ITF Croatia F2 | 2018/03/15 09:00 | Zdenek Kolar v Nik Razborsek | 6-7,4-6 |
| ITF Croatia F2 | 2018/03/14 10:35 | Sebastian Prechtel v Nik Razborsek | 1-6,6-4,4-6 |
| ITF Croatia F2 | 2018/03/12 11:00 | Nik Razborsek v Nicolo Crespi | 6-1,6-0 |
| ITF Croatia F2 | 2018/03/11 08:00 | Nik Razborsek v Matteo Fortini | 6-1,6-2 |
| ITF Croatia F1 | 2018/03/09 09:00 | Pavel Nejedly v Nik Razborsek | 7-5,6-2 |
| ITF Croatia F1 | 2018/03/08 11:30 | Nik Razborsek v Gabriel Schmidt | 6-2,4-6,10-7 |
| ITF Croatia F1 | 2018/03/07 08:00 | Nik Razborsek v Lorenzo Corioni | 6-0,6-1 |