Stadium: Court 5 Round: 25 Ground: Hardcourt outdoor
| ITF M25 Fayetteville | 2021/09/21 14:00 | Sander Jong v Finn Bass | 1-6,4-6 |
| ITF M25 Fayetteville | 2021/09/20 17:00 | Sander Jong v Parth Aggarwal | 6-0,6-3 |
| UTR Pro Tennis Series Dallas | 2021/09/04 14:30 | Evan Zhu v Sander Jong | 6-4,6-4 |
| UTR Pro Tennis Series Dallas | 2021/09/03 13:00 | Colin Markes v Sander Jong | 1-6,6-4,2-5 |
| UTR Pro Tennis Series Dallas | 2021/09/02 14:30 | Jerry Barton v Sander Jong | 3-6,2-6 |
| UTR Pro Tennis Series Dallas | 2021/08/31 14:30 | Jacob Brumm v Sander Jong | 4-6,2-6 |
| UTR Pro Tennis Series Dallas | 2021/08/30 17:30 | Sander Jong v Stefan Latinov | 6-2,6-0 |
| ITF M15 Oldenzaal | 2021/08/20 10:20 | Sander Jong v Guy Den Heijer | 5-7,7-5,4-6 |
| 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 Champaign | 2021/07/28 16:45 | Christian Langmo v Karlis Ozolins | 7-6,6-1 |