Stadium: Opatija 3 Round: 25 Ground: Clay
| 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 Great Britain F1 | 2018/02/03 10:00 | Yannick Mertens v Matteo Viola | 7-6,6-1 |
| ITF Croatia F2 | 2018/03/14 10:35 | Sebastian Prechtel v Nik Razborsek | 1-6,6-4,4-6 |
| ITF Croatia F1 | 2018/03/07 09:00 | Sebastian Prechtel v Karlo Kranic | 2-6,7-5,4-10 |
| ITF Croatia F1 | 2018/03/04 15:00 | Sebastian Prechtel v Frane Nincevic | 6-4,7-5 |
| Challenger Eckental Qual | 2017/10/30 11:30 | Evan Furness v Sebastian Prechtel | 7-5,6-1 |
| Challenger Eckental Qual | 2017/10/29 09:00 | Sebastian Prechtel v Fabian Penzkofer | 6-2,6-1 |
| Challenger Eckental Qual | 2017/10/28 07:30 | Sebastian Prechtel v Andreas Siljestrom | 4-6,6-1,6-1 |
| ITF Germany F16 | 2017/10/24 12:25 | Sebastian Prechtel v Daniel Masur | 3-6,3-6 |
| ITF Germany F16 | 2017/10/23 10:00 | Sebastian Prechtel v Mick Veldheer | 6-3,5-7,6-1 |