Stadium: Court 6 Round: 26 Ground: Clay
| ITF Finland F3 | 2018/08/16 11:15 | Karl Friberg v Niklas-Salminen, Patrick | 7-6,7-6 |
| 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 - M15 Antalya | 2019/04/10 11:30 | Petr Nouza v Karl Friberg | 3-6,5-7 |
| ITF M15 Cancun | 2019/03/27 16:30 | Juan Pablo Varillas v Karl Friberg | 6-0,6-4 |
| ITF M15 Cancun | 2019/03/25 19:00 | Karl Friberg v Trocker, Moritz | 6-2,5-7,10-1 |
| ITF M15 Cancun | 2019/03/25 17:00 | Karl Friberg v Gessner, Lucas | 6-1,6-2 |
| ITF - M25 Calabasas | 2019/03/18 17:00 | Karue Sell v Karl Friberg | 6-2,6-0 |
| Arcadia, Singles Qualifying M-ITF-USA-09A | 2019/03/14 18:30 | Karl Friberg v Emilio Nava | 4-6,2-6 |
| Arcadia, Singles Qualifying M-ITF-USA-09A | 2019/03/13 19:25 | Karl Friberg v Shabaz, Michael | 4-6,6-4,7-5 |
| ITF - M15 Sharm El Sheikh | 2019/02/21 08:00 | Fajing Sun v Karl Friberg | 6-2,6-4 |
| ITF - M15 Antalya | 2019/04/10 06:45 | Konecny, Michal v Niklas-Salminen, Patrick | 5-7,4-6 |
| ITF Finland F4 | 2018/11/14 15:00 | Otto Virtanen v Niklas-Salminen, Patrick | 6-3,7-6 |
| ITF Finland F4 | 2018/11/13 15:50 | Rouvala, Mikko v Niklas-Salminen, Patrick | 0-6,0-6 |
| Challenger Bratislava | 2018/11/04 10:20 | Alexander Bublik v Niklas-Salminen, Patrick | 6-4,7-6 |
| Challenger Bratislava | 2018/11/03 11:15 | Samuel Puskar v Niklas-Salminen, Patrick | 2-6,3-6 |
| Challenger Eckental | 2018/10/28 10:00 | Alexander Bublik v Niklas-Salminen, Patrick | 7-6,6-3 |
| Challenger Ismaning | 2018/10/13 13:30 | Geoffrey Blancaneaux v Niklas-Salminen, Patrick | 6-4,6-3 |
| ITF Sweden F5 | 2018/10/06 10:00 | Emil Ruusuvuori v Niklas-Salminen, Patrick | 6-4,6-4 |