Estádio: Court 3 Round: 25 Ground: Hardcourt indoor
| ITF - M15 Champaign | 2021/09/15 14:55 | Karlis Ozolins v Dali Blanch | 5-7,6-7 |
| ITF - M15 Žilina | 2021/09/01 09:55 | Karlis Ozolins v Francesco Vilardo | 1-6,2-6 |
| ITF - M15 Bratislava | 2021/08/25 08:00 | Karlis Ozolins v Edoardo Lavagno | 0-6,6-0,4-6 |
| ITF - M15 Łódź | 2021/08/17 08:00 | Karlis Ozolins v Markus Eriksson | 6-7,6-1,2-6 |
| ITF - M25 Decatur | 2021/08/06 15:00 | Karlis Ozolins v Paul Jubb | 1-6,6-1,6-7 |
| ITF - M25 Decatur | 2021/08/05 14:50 | Karlis Ozolins v Shintaro Imai | 7-6,3-6,7-6 |
| ITF - M25 Decatur | 2021/08/04 18:25 | Kaichi Uchida v Karlis Ozolins | 4-6,4-6 |
| ITF - M25 Champaign | 2021/07/28 16:45 | Christian Langmo v Karlis Ozolins | 7-6,6-1 |
| ITF - M15 Sozopol | 2021/10/11 10:00 | Yannik Steinegger v Ainius Sabaliauskas | 6-3,6-2 |
| ITF - M15 Vyshkovo | 2021/09/20 06:00 | Federico Campana v Ainius Sabaliauskas | 7-5,2-6,10-6 |
| ITF - M15 Chornomorsk | 2021/09/01 07:00 | Yan Bondarevskiy v Ainius Sabaliauskas | 7-5,6-2 |
| ITF - M15 Chornomorsk | 2021/08/30 12:00 | Maik Steiner v Ainius Sabaliauskas | 7-5,6-7,4-10 |
| ITF - M15 Chornomorsk | 2021/08/30 07:00 | Ainius Sabaliauskas v Alexey Dubinin | 6-1,6-1 |
| ITF - M15 Chornomorsk | 2021/08/29 09:30 | Ainius Sabaliauskas v Mykyta Rassolov | 6-1,6-2 |
| ITF - M15 Vilnius | 2019/07/10 10:30 | Ainius Sabaliauskas v Savriyan Danilov | 3-6,3-6 |
| ITF - Lituânia F1 | 2018/07/21 10:00 | Ainius Sabaliauskas v Matas Vasiliauskas | 4-6,4-6 |