Stadium: Court 2 Round: 26 Ground: Clay
| ITF Netherlands F5 | 2018/08/21 09:55 | Nik Razborsek v Hellfritsch, Lucas | 6-4,7-6 |
| 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 Netherlands F5 | 2018/08/21 12:20 | Kaczynski, Kevin v Gerritsen, Stephan | 6-4,1-6,6-2 |
| ITF Netherlands F5 | 2018/08/19 10:00 | Kaczynski, Kevin v Trismen, Harris | 6-0,6-1 |
| ITF Netherlands F5 | 2018/08/18 08:00 | Kaczynski, Kevin v Ruenger, Roman | 6-1,6-0 |
| ITF Germany F11 | 2018/08/09 09:00 | Kaczynski, Kevin v Benjamin Hassan | 2-6,1-6 |
| ITF Germany F11 | 2018/08/08 10:00 | Chaukulkar, Tejas v Kaczynski, Kevin | 3-6,6-4,1-6 |
| ITF Germany F11 | 2018/08/07 11:40 | Baumann, Daniel v Kaczynski, Kevin | 3-6,0-6 |
| ITF Netherlands F3 | 2018/07/10 13:55 | Gerritsen, Stephan v Kaczynski, Kevin | 7-6,2-6,6-1 |
| ITF Netherlands F3 | 2018/07/08 11:30 | Kaczynski, Kevin v Naser, Javier | 6-0,6-7,7-6 |