Stadium: Court Tsitsipas Round: 25 Ground: Hardcourt outdoor
| ITF M15 Parnu | 2021/10/26 09:00 | Karlis Ozolins v Ainius Sabaliauskas | 5-7,4-6 |
| ITF M15 Champaign | 2021/09/15 14:55 | Karlis Ozolins v Dali Blanch | 5-7,6-7 |
| ITF M15 Zilina | 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 Lodz | 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 Skopje | 2021/09/29 11:50 | Aristotelis Thanos v Gorazd Srbljak | 2-6,4-6 |
| ITF M25 Skopje | 2021/09/28 07:30 | Aristotelis Thanos v William Ma | 6-4,6-1 |
| ITF M25 Skopje | 2021/09/27 11:00 | Aristotelis Thanos v Ivan Manasov | 6-3,6-2 |
| ITF M15 Pirot | 2021/09/22 08:00 | Tom Kocevar-Desman v Aristotelis Thanos | 7-6,6-1 |
| ITF M15 Ulcinj | 2021/09/02 08:30 | Antonio Cayetano March v Aristotelis Thanos | 7-6,6-4 |
| ITF M15 Ulcinj | 2021/09/01 10:00 | Aristotelis Thanos v Duje Kekez | 2-6,7-6,6-0 |
| ITF M15 Ulcinj | 2021/08/30 11:30 | Aristotelis Thanos v Aleksandar Tomas | 5-7,2-6 |
| ITF M15 Ulcinj | 2021/08/30 07:30 | Aristotelis Thanos v Danilo Raicevic | 6-2,6-1 |