Stadium: Court 7 Round: 27 Ground: Clay
| ITF Estonia F2 | 2017/10/23 10:25 | Niklas-Salminen, Patrick v Karl Friberg | 7-6,6-2 |
| ITF Finland F3 | 2017/08/16 10:00 | Karl Friberg v Niklas-Salminen, Patrick | 6-2,3-6,6-2 |
| ITF Finland F3 | 2018/08/15 08:00 | Karl Friberg v Kristjan Tamm | 6-3,6-2 |
| ITF Finland F3 | 2018/08/14 11:40 | Karl Friberg v Patrick Kaukovalta | 6-3,6-4 |
| ITF Finland F2 | 2018/08/09 09:30 | Rochette, Laurent v Karl Friberg | 6-1,6-0 |
| ITF Finland F2 | 2018/08/08 08:00 | Kristjan Tamm v Karl Friberg | 4-6,3-6 |
| ITF Finland F2 | 2018/08/06 09:55 | Ahti, Ville-Petteri 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 | Kocevar-Desman, Tom 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 Finland F3 | 2018/08/15 10:00 | Minin, Matvey v Niklas-Salminen, Patrick | 5-7,4-6 |
| ITF Finland F3 | 2018/08/14 11:25 | Solberg, Christoffer v Niklas-Salminen, Patrick | 0-6,1-6 |
| ITF Finland F2 | 2018/08/10 12:00 | Rochette, Laurent v Niklas-Salminen, Patrick | 6-2,6-1 |
| ITF Finland F2 | 2018/08/09 12:00 | Niklas-Salminen, Patrick v George Loffhagen | 7-6,1-6,6-2 |
| ITF Finland F2 | 2018/08/08 10:05 | Niklas-Salminen, Patrick v Hietaranta, Roni Mikael | 6-3,6-3 |
| ITF Finland F2 | 2018/08/07 10:00 | Niklas-Salminen, Patrick v Eero Vasa | 6-2,6-3 |
| ITF Finland F1 | 2018/08/04 09:00 | Hansson, Gustav v Niklas-Salminen, Patrick | 7-6,6-0 |
| ITF Finland F1 | 2018/08/03 13:40 | Ivanov, Vladimir v Niklas-Salminen, Patrick | 3-6,2-6 |