Stadium: Centre Court Round: 25 Ground: Clay
| Portoroz, Slovénie | 2018/08/07 14:00 | Nik Razborsek v Dominik Koepfer | 7-6,5-7,6-7 |
| Challenger Liberec | 2018/07/31 14:00 | Pedro Martinez v Nik Razborsek | 6-3,4-6,6-3 |
| Challenger Liberec Qual | 2018/07/30 09:00 | Marvin Moeller v Nik Razborsek | 4-6,6-7 |
| Challenger Liberec Qual | 2018/07/29 08:30 | Bugaj, Martin v Nik Razborsek | 2-6,0-6 |
| Challenger Tampere Qual | 2018/07/22 11:45 | Nik Razborsek v Eriksson, Markus | 3-6,4-6 |
| Challenger Tampere | 2018/07/21 13:55 | Kristjan Tamm v Nik Razborsek | 6-2,3-6,6-7 |
| Umag, Croatie, Qualifications | 2018/07/15 10:00 | Alexey Vatutin v Nik Razborsek | 6-2,6-3 |
| ITF Italy F14 | 2018/06/16 14:00 | Nik Razborsek v Bellotti, Riccardo | 4-6,3-6 |
| ITF Netherlands F5 | 2018/08/19 10:00 | Schroll, Philipp v Hellfritsch, Lucas | 2-6,1-6 |
| ITF Netherlands F5 | 2018/08/18 08:00 | Hellfritsch, Lucas v Oscar Moraing | 2-6,7-6,6-1 |
| ITF Netherlands F5 | 2018/08/18 07:00 | Hellfritsch, Lucas v Allemby, James | 6-3,7-6 |
| ITF Netherlands F4 | 2018/08/12 12:00 | Hellfritsch, Lucas v Merino, Alexander | 4-6,3-6 |
| ITF Poland F6 | 2018/08/07 08:00 | Hellfritsch, Lucas v Matias Franco Descotte | 1-6,1-6 |
| ITF Poland F6 Qual | 2018/08/06 08:00 | Wojcik, Yann v Hellfritsch, Lucas | 6-7,4-6 |
| ITF Poland F6 Qual | 2018/08/05 09:30 | Mugevicius, Lukas v Hellfritsch, Lucas | 6-4,1-6,0-6 |
| ITF Germany F9 | 2018/07/22 11:00 | Hellfritsch, Lucas v Maik Steiner | 6-7,3-6 |