Stadium: Court 4 Round: 25 Ground: Clay
| Challenger Tampere | 2018/07/21 13:55 | Kristjan Tamm v Nik Razborsek | 6-2,3-6,6-7 |
| ITF Turkey F36 | 2018/11/18 07:00 | Dante Gennaro v Nik Razborsek | 7-6,4-6,7-5 |
| ITF Turkey F36 | 2018/11/16 07:00 | Nik Razborsek v Gabriel Donev | 6-1,3-6,6-4 |
| ITF Turkey F36 | 2018/11/15 10:00 | Nik Razborsek v Geronimo E Busleiman | 6-3,6-3 |
| ITF Turkey F36 | 2018/11/13 07:00 | Nik Razborsek v Benjamin Dhoe | 6-2,6-3 |
| ITF Turkey F35 | 2018/11/11 07:30 | Bruno Santanna v Nik Razborsek | 4-6,4-6 |
| ITF Turkey F35 | 2018/11/10 07:00 | Nik Razborsek v Javier Barranco Cosano | 6-3,6-4 |
| ITF Turkey F35 | 2018/11/09 07:00 | Nik Razborsek v Pol Toledo Bague | 7-5,6-2 |
| ITF Turkey F35 | 2018/11/08 08:40 | Nik Razborsek v Mikhail Korovin | 6-0,7-5 |
| ITF Tunisia F44 | 2018/12/10 08:30 | Yan Bondarevskiy v Kristjan Tamm | 6-3,6-1 |
| ITF Tunisia F44 | 2018/12/08 08:00 | Vitalii Shcherba v Kristjan Tamm | 0-6,3-6 |
| ITF Tunisia F43 | 2018/12/06 08:00 | Kristjan Tamm v Evan Hoyt | 3-6,2-6 |
| ITF Tunisia F43 | 2018/12/05 10:10 | Kristjan Tamm v Erik Crepaldi | 7-6,6-3 |
| ITF Tunisia F43 | 2018/12/03 08:30 | Maikel Borg v Kristjan Tamm | 5-7,3-6 |
| ITF Tunisia F43 | 2018/12/02 08:00 | Himansu Sagar v Kristjan Tamm | 4-6,0-6 |
| ITF Tunisia F42 | 2018/11/28 08:00 | Kristjan Tamm v Moez Echargui | 3-6,2-6 |
| ITF Tunisia F42 | 2018/11/26 08:30 | David Jorda Sanchis v Kristjan Tamm | 4-6,4-6 |