Stadium: Court 6 Round: 44 Ground: Clay
| ITF Netherlands F2 Qual | 2018/07/02 08:00 | Van Terheijden, Tim v Naser, Javier | 6-4,4-6,4-6 |
| ITF Greece F3 | 2018/03/15 09:25 | Van Terheijden, Tim v Adrian Bodmer | 6-7,6-7 |
| ITF Greece F3 | 2018/03/14 11:20 | Giorgio Ricca v Van Terheijden, Tim | 4-6,4-6 |
| ITF Greece F3 | 2018/03/12 08:00 | Van Terheijden, Tim v Robert Strombachs | 6-3,6-0 |
| ITF Greece F3 | 2018/03/11 08:00 | Van Terheijden, Tim v Kohl, Cristopher | 6-1,6-0 |
| ITF Greece F2 | 2018/03/07 10:00 | Van Terheijden, Tim v Gray, Jonathan | 6-7,0-6 |
| ITF Greece F2 | 2018/03/05 07:30 | Van Terheijden, Tim v Jacopo Berrettini | 6-3,3-6,6-2 |
| ITF Greece F2 | 2018/03/04 09:30 | Van Terheijden, Tim v Acevedo, Nicolas | 7-6,6-3 |
| ITF Netherlands F4 | 2018/08/11 09:00 | Krattiger, Jesse Paul v Eisinga, Zachary | 4-6,3-6 |
| ITF Belgium F6 | 2018/08/01 13:00 | Eisinga, Zachary v Klegou, Alexis | 2-6,5-7 |
| ITF Belgium F6 Qual | 2018/07/30 08:00 | Lambling, Raphael v Eisinga, Zachary | 6-4,2-6,1-6 |
| ITF Belgium F6 Qual | 2018/07/29 11:40 | Eisinga, Zachary v Maxence Bertimon | 3-6,6-3,6-0 |
| ITF Belgium F6 Qual | 2018/07/28 09:30 | Meuffels, Alban v Eisinga, Zachary | 6-3,5-7,2-6 |
| ITF Belgium F5 | 2018/07/21 08:30 | Eisinga, Zachary v Broekhof, Nick | 6-7,6-4,3-6 |
| ITF Netherlands F3 | 2018/07/08 11:30 | Eisinga, Zachary v Pereira, Miguel Fernando | 6-1,3-6,2-6 |
| ITF Netherlands F3 | 2018/07/07 14:00 | Eisinga, Zachary v Berry, Noah | 6-3,6-1 |