Stadium: Court 1 Round: 25 Ground: Clay
| ITF M25 Vogau | 2020/08/17 09:00 | Timofey Skatov v Karlis Ozolins | 6-7,6-3,10-4 |
| ITF M25 Vogau | 2020/08/16 09:30 | Roko Horvat v Karlis Ozolins | 4-6,3-6 |
| Baltic Tennis League | 2020/06/26 12:25 | Robin Erik Parts v Karlis Ozolins | 6-4,6-0 |
| Baltic Tennis League | 2020/06/25 12:50 | Gustavs Lukstins v Karlis Ozolins | 6-7,7-6,3-6 |
| Baltic Tennis League | 2020/06/24 13:25 | Arturs Kazijevs v Karlis Ozolins | 4-6,6-0,1-6 |
| Baltic Tennis League | 2020/06/23 12:25 | Karlis Ozolins v Alexander Georg Mandma | 6-1,6-2 |
| Davis Cup | 2020/03/06 15:00 | Karlis Ozolins v Mohamed Safwat | 6-7,5-7 |
| ITF M15 Trnava | 2020/03/01 10:00 | Danylo Kalenichenko v Karlis Ozolins | 6-4,6-4 |
| ITF M15 Anif | 2020/08/24 12:50 | Kai Lemstra v Benedikt Emesz | 6-1,6-2 |
| ITF M15 Anif | 2020/08/23 12:00 | Kirill Kivattsev v Kai Lemstra | 6-7,3-6 |
| ITF M15 Sharm El Sheikh | 2020/03/11 11:40 | Francesco Vilardo v Kai Lemstra | 6-4,6-7,7-5 |
| ITF M15 Trnava | 2020/02/27 12:10 | Kai Lemstra v Aldin Setkic | 3-6,3-6 |
| ITF M15 Trnava | 2020/02/26 12:10 | Kai Lemstra v Andrej Glvac | 6-4,6-4 |
| ITF M15 Trnava | 2020/02/25 09:00 | Dominik Recek v Kai Lemstra | 6-7,3-6 |
| ITF M15 Trnava | 2020/02/24 14:00 | Kai Lemstra v Piotr Matuszewski | 6-2,6-0 |
| ITF M15 Oberhaching | 2020/02/16 15:00 | Christoph Negritu v Kai Lemstra | 7-6,6-1 |