Stadium: Court 1 Round: 26 Ground: Clay
| ITF Finland F2 | 2018/08/07 08:00 | Lorenzo Bocchi v Kristjan Tamm | 3-6,2-6 |
| ITF Finland F2 Qual | 2018/08/05 08:00 | Kristjan Tamm v Gabriele Moghini | 4-6,6-3,6-3 |
| ITF Finland F1 | 2018/07/30 07:00 | Mattias Siimar v Kristjan Tamm | 6-1,6-2 |
| Challenger Tampere | 2018/07/21 13:55 | Kristjan Tamm v Nik Razborsek | 6-2,3-6,6-7 |
| ITF Estonia F1 | 2018/07/17 07:00 | Emil Ruusuvuori v Kristjan Tamm | 6-3,5-7,6-3 |
| ITF Italy F15 | 2018/06/17 09:35 | Vazha Shubladze v Kristjan Tamm | 4-6,2-6 |
| ITF Hungary F4 Qual | 2018/06/11 08:00 | Ken Onishi v Kristjan Tamm | 6-3,2-6,6-3 |
| ITF Hungary F4 Qual | 2018/06/10 08:00 | Filip Kucbel v Kristjan Tamm | 2-6,5-7 |
| ITF Finland F2 | 2018/08/06 09:55 | Ville-Petteri Ahti v Karl Friberg | 0-6,4-6 |
| Challenger Sopot Qual | 2018/07/30 08:30 | Renzo Olivo v Karl Friberg | 6-4,7-6 |
| Challenger Tampere | 2018/07/21 11:40 | Tom Kocevar-Desman v Karl Friberg | 6-4,7-6 |
| ITF Estonia F1 | 2018/07/18 07:00 | Karl Friberg v Denis Klok | 4-6,6-3,5-7 |
| ITF Estonia F1 | 2018/07/17 08:45 | Martins Rocens v Karl Friberg | 5-7,0-6 |
| Challenger Bastad Qual | 2018/07/08 11:40 | Jules Okala v Karl Friberg | 6-0,6-0 |
| Challenger Bastad Qual | 2018/07/08 08:15 | Karl Friberg v Antoine Bellier | 6-2,6-4 |
| Challenger Bastad Qual | 2018/07/07 10:05 | Ruben Gonzales v Karl Friberg | 2-6,1-6 |