Stadium: Court 5 Round: 25 Ground: Hardcourt outdoor
| ITF - M15 Monastir | 2021/04/20 09:00 | Ozolins, Karlis v Viktor Jovic | 7-5,4-6,3-6 |
| 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 Monastir | 2021/04/24 09:30 | Ribeiro Marcondes, Igor v Oscar Jose Gutierrez | 6-4,7-5 |
| ITF - M15 Monastir | 2021/04/23 14:00 | Oscar Jose Gutierrez v Jonathan Mridha | 6-4,6-3 |
| ITF - M15 Monastir | 2021/04/22 08:30 | Oscar Jose Gutierrez v Viktor Jovic | 6-2,6-3 |
| ITF - M15 Monastir | 2021/04/21 10:20 | Oscar Jose Gutierrez v Benjamin Pietri | 6-3,6-2 |
| ITF - M15 Sharm El Sheikh | 2021/03/31 13:25 | Oscar Jose Gutierrez v Ryan Nijboer | 7-6,2-6,3-6 |
| ITF - M15 Sharm El Sheikh | 2021/03/26 07:30 | Oscar Jose Gutierrez v Marcello Serafini | 4-6,4-6 |
| ITF - M15 Sharm El Sheikh | 2021/03/25 07:30 | Oscar Jose Gutierrez v Samuel Vincent Ruggeri | 6-0,3-6,6-2 |
| ITF - M15 Sharm El Sheikh | 2021/03/24 11:55 | Oscar Jose Gutierrez v Karlo Cubelic | 4-6,6-3,7-6 |