Stadium: Court 2 Round: 27 Ground: Clay
| ITF M15 Vejle | 2021/07/30 08:00 | Ergi Kirkin v Alexander Kotzen | 6-2,6-3 |
| ITF M15 Vejle | 2021/07/28 10:25 | Ergi Kirkin v Andrea Del Federico | 3-6,6-2,6-2 |
| Challenger Nur-Sultan | 2021/07/20 09:10 | Ergi Kirkin v Ryan Peniston | 2-6,3-6 |
| Challenger Nur-Sultan | 2021/07/19 06:10 | Ergi Kirkin v Benjamin Lock | 5-7,7-6,3-6 |
| Challenger Nur-Sultan | 2021/07/12 04:00 | Ergi Kirkin v Oleksii Krutykh | 1-6,6-7 |
| Challenger Nur-Sultan | 2021/07/11 04:00 | Ergi Kirkin v Timur Mukhtarulin | 6-2,6-0 |
| ITF M25 Alkmaar | 2021/06/23 11:15 | Ergi Kirkin v Marko Tepavac | 4-6,3-6 |
| Challenger – Almatõ | 2021/06/15 11:50 | Zizou Bergs v Ergi Kirkin | 6-4,5-7,6-2 |
| ITF M15 Vejle | 2021/07/30 07:55 | Karl Friberg v Vasil Kirkov | 6-2,7-6 |
| ITF M15 Vejle | 2021/07/28 07:55 | Tommaso Compagnucci v Karl Friberg | 4-6,7-5,4-6 |
| ITF M15 Helsinki | 2021/06/05 07:00 | Karl Friberg v Kyrian Jacquet | 5-7,1-6 |
| ITF M15 Helsinki | 2021/06/04 10:50 | Jaimee Floyd Angele v Karl Friberg | 5-7,6-4,3-6 |
| ITF M15 Helsinki | 2021/06/03 09:30 | Sean Cuenin v Karl Friberg | 4-6,4-6 |
| ITF M15 Helsinki | 2021/06/02 08:15 | Karl Friberg v Cristian Rodriguez | 7-6,2-6,6-4 |
| ITF M15 Antalya | 2021/05/19 09:55 | Karl Friberg v Nick Hardt | 1-6,1-6 |
| ITF M15 Antalya | 2021/05/10 07:00 | Karl Friberg v Valentin Vanta | 3-6,6-7 |