Stadium: Clay 6 Round: 62 Ground: Clay
| ITF Turkey F29 | 2018/09/22 09:30 | van Nieuwenhove, Jonathan v Kargin, Kayra | 6-0,6-3 |
| ITF Belgium F10 Qual | 2018/08/25 08:00 | van Nieuwenhove, Jonathan v Dielen, Liam | 6-2,5-7,3-6 |
| ITF Belgium F4 | 2018/07/15 08:30 | van Nieuwenhove, Jonathan v Zaidman, Nicolas | 4-6,0-6 |
| ITF Belgium F4 | 2018/07/14 10:45 | Dias, Francisco v van Nieuwenhove, Jonathan | 5-7,7-5,4-6 |
| ITF Belgium F4 | 2018/07/14 07:00 | van Nieuwenhove, Jonathan v Louis Van Herck | 7-6,6-3 |
| ITF Tunisia F25 | 2018/06/23 08:00 | Diego F Flores v van Nieuwenhove, Jonathan | 7-5,5-7,7-5 |
| ITF Germany F4 | 2018/06/17 12:00 | Kai Wehnelt v van Nieuwenhove, Jonathan | 6-2,6-3 |
| ITF Germany F4 | 2018/06/16 08:00 | Flinner, Marek v van Nieuwenhove, Jonathan | 6-7,4-6 |
| ITF Turkey F29 | 2018/09/22 07:00 | Walder, Jordi v Schwencke Lindqvist, Thomas | 6-2,6-1 |
| ITF Turkey F28 | 2018/09/20 09:10 | Walder, Jordi v Perchicot, Mathieu | 4-6,2-6 |
| ITF Turkey F28 | 2018/09/18 09:10 | Walder, Jordi v Khaledan, Shahin | 6-4,6-2 |
| ITF Turkey F28 | 2018/09/16 07:30 | Prechtel, Sebastian v Walder, Jordi | 3-6,3-6 |
| ITF Romania F13 | 2018/09/09 10:00 | Walder, Jordi v Ramazzoti, Samuele | 0-6,2-6 |
| ITF Germany F13 | 2018/08/22 08:00 | Peter Heller v Walder, Jordi | 7-6,6-3 |
| ITF Germany F13 | 2018/08/20 09:00 | Kai Lemstra v Walder, Jordi | 3-6,6-1,3-6 |
| ITF Germany F13 | 2018/08/19 08:00 | Walder, Jim v Walder, Jordi | 0-6,6-2,1-6 |