Stadium: Opatija 1 Round: 60 Ground: Clay
| ITF Croatia F3 | 2018/03/18 16:00 | Constantin Christ v Dominik Kisantal | 6-2,6-4 |
| ITF Qatar F3 Qual | 2018/03/11 17:15 | Hong Kit Wong v Constantin Christ | 6-3,6-4 |
| ITF Qatar F3 Qual | 2018/03/10 08:00 | Hamad Nawaf v Constantin Christ | 2-6,1-6 |
| ITF Qatar F2 Qual | 2018/03/04 12:00 | Constantin Christ v Sean Hodkin | 2-6,1-6 |
| ITF Qatar F1 Qual | 2018/02/25 12:00 | George Botezan v Constantin Christ | 6-4,6-3 |
| ITF Qatar F1 Qual | 2018/02/24 08:00 | Mohamed Adnaoui v Constantin Christ | 1-6,6-4,3-6 |
| ITF Switzerland F1 Qual | 2018/02/04 11:30 | Constantin Christ v Jakob Aichhorn | 6-7,0-6 |
| ITF Switzerland F1 Qual | 2018/02/03 11:30 | Constantin Christ v Edoardo Graziani | 7-5,6-7,6-3 |
| ITF Greece F2 | 2018/03/03 07:30 | Dusan Rajic v Diego Matos | 4-6,3-6 |
| ITF Greece F1 | 2018/02/26 13:00 | Dusan Rajic v Jeremy Sonkin | 3-6,1-6 |
| ITF Czech Republic F12 | 2017/11/28 10:40 | Jakob Sude v Dusan Rajic | 6-4,6-2 |
| ITF Czech Republic F12 | 2017/11/27 12:00 | Nenad Vladusic v Dusan Rajic | 2-6,2-6 |
| ITF Czech Republic F9 | 2017/11/06 09:00 | Johann Willems v Dusan Rajic | 6-3,6-3 |
| ITF Czech Republic F8 Qual | 2017/10/31 09:00 | Jan Satral v Dusan Rajic | 6-1,6-3 |
| ITF Czech Republic F8 Qual | 2017/10/30 12:00 | Dominik Recek v Dusan Rajic | 6-2,3-6,3-6 |
| ITF Serbia F5 Qual | 2017/09/03 09:00 | Dusan Rajic v Pavle Daljev | 1-6,1-6 |