Stadium: Opatija 1 Round: 60 Ground: Clay
| 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 Germany F10 | 2017/08/06 08:00 | Jan Soeren Hain v Constantin Christ | 6-2,6-0 |
| ITF Germany F9 | 2017/07/30 10:30 | Paul Monteban v Constantin Christ | 6-0,6-1 |
| ITF Germany F1 Qual | 2015/01/06 09:00 | Christian Hirschmueller v Constantin Christ | 7-5,6-1 |
| ITF Germany F1 Qual | 2015/01/05 09:00 | Nathaniel Seyler v Constantin Christ | 6-4,4-6,3-6 |
| ITF Germany F15 | 2014/10/05 08:00 | Daniel Czepielewski v Constantin Christ | 6-4,6-1 |
| ITF Germany F7 | 2014/07/08 09:30 | Alexey Vatutin v Constantin Christ | 6-3,6-1 |
| 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 |
| ITF Serbia F4 Qual | 2017/08/26 09:30 | Harrison Lombe v Dusan Rajic | 7-5,7-6 |
| ITF Serbia F1 | 2017/08/10 09:25 | Dusan Rajic v Dante Gennaro | 1-6,2-6 |