Stadium: Court 5 Round: 25 Ground: Hardcourt outdoor
| ITF - M15 Sharm El Sheikh | 2021/03/17 07:30 | Ozolins, Karlis v Illya Beloborodko | 2-6,1-6 |
| ITF - M15 Sharm El Sheikh | 2021/03/10 10:55 | Ozolins, Karlis v Jacopo Berrettini | 1-6,4-6 |
| ITF M15 St Petersburg | 2021/02/09 11:15 | Ozolins, Karlis v Kravchuk, Konstantin | 4-6,3-6 |
| ITF M15 St Petersburg | 2021/02/04 07:00 | Alexey Zakharov v Ozolins, Karlis | 4-6,6-2,7-6 |
| ITF M15 St Petersburg | 2021/02/02 11:30 | Ozolins, Karlis v Daniil Golubev | 6-3,6-1 |
| ITF - M15 Manacor | 2021/01/13 08:55 | Okala, Jules v Ozolins, Karlis | 3-6,6-4,6-1 |
| ITF - M15 Manacor | 2021/01/09 19:35 | Evan Furness v Ozolins, Karlis | 6-2,6-4 |
| ITF - M15 Manacor | 2021/01/05 13:50 | Ozolins, Karlis v Arthur Reymond | 6-4,6-3 |
| ITF - M15 Monastir | 2021/04/11 11:00 | Viktor Jovic v Niklas Schell | 6-7,2-6 |
| ITF - M15 Monastir | 2021/03/16 10:25 | Viktor Jovic v Rodrigues, Natan | 6-3,6-7,5-7 |
| ITF - M15 Monastir | 2021/03/11 12:35 | Viktor Jovic v Carr, Simon | 0-6,1-6 |
| ITF - M15 Monastir | 2021/03/10 12:40 | Ganchev, Alex v Viktor Jovic | 2-6,4-6 |
| ITF - M15 Monastir | 2021/03/08 16:45 | Alessandro Ingarao v Viktor Jovic | 2-6,4-6 |
| ITF - M15 Monastir | 2021/03/08 12:30 | Tobias Franco v Viktor Jovic | 6-3,4-6,1-10 |
| ITF - M15 Monastir | 2021/03/07 09:00 | Viktor Jovic v Aristotelis Thanos | 6-2,2-6,11-9 |
| ITF - M15 Monastir | 2021/03/01 12:30 | Viktor Jovic v Kotzen, Alexander | 2-6,1-6 |