Stadium: Court 10 Round: 25 Ground: Clay
| 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 Monastir | 2021/05/06 10:05 | Mohamed Aziz Dougaz v Karlis Ozolins | 6-4,6-3 |
| ITF M15 Monastir | 2021/05/04 10:30 | Jabari Stafford v Karlis Ozolins | 1-6,1-6 |
| ITF M15 Monastir | 2021/04/27 08:30 | Karlis Ozolins v Oscar Jose Gutierrez | 4-6,2-6 |
| ITF M15 Monastir | 2021/04/20 09:00 | Karlis Ozolins v Viktor Jovic | 7-5,4-6,3-6 |
| ITF M15 Gdynia | 2021/08/11 08:00 | Daniel De Jonge v Markus Eriksson | 6-4,6-1 |
| ITF M15 Frederiksberg | 2021/08/08 10:00 | Markus Eriksson v Jonathan Mridha | 3-6,6-7 |
| ITF M15 Frederiksberg | 2021/08/07 11:05 | Markus Eriksson v August Holmgren | 6-3,3-6,6-4 |
| ITF M15 Frederiksberg | 2021/08/06 10:50 | Markus Eriksson v Vasil Kirkov | 6-4,6-3 |
| ITF M15 Frederiksberg | 2021/08/05 10:20 | Markus Eriksson v Nikola Slavic | 6-3,6-1 |
| ITF M15 Frederiksberg | 2021/08/03 13:05 | Markus Eriksson v George Loffhagen | 6-7,6-2,6-2 |
| Challenger Tampere | 2021/07/18 08:00 | Bogdan Bobrov v Markus Eriksson | 7-6,6-4 |
| ATP Bastad | 2021/07/11 09:00 | Markus Eriksson v Thomas Fabbiano | 6-7,4-6 |