Stadium: Court 7 Round: 25 Ground: Hardcourt outdoor
| Challenger Helsinki | 2021/11/14 10:20 | Kristjan Tamm v Shintaro Mochizuki | 6-7,3-6 |
| ITF M25 Grasse | 2021/06/15 10:35 | Clement Tabur v Kristjan Tamm | 6-2,7-5 |
| ITF M15 Sarajevo | 2021/06/02 09:00 | Gilbert S K Junior v Kristjan Tamm | 6-4,6-2 |
| ITF M25 Kiseljak | 2021/05/26 14:25 | Rrezart Cungu v Kristjan Tamm | 6-3,6-4 |
| ITF M15 Brcko | 2021/05/21 07:35 | Kristjan Tamm v Dusan Rajic | 4-6,5-7 |
| ITF M15 LPD Gran Canaria | 2021/04/28 08:30 | Kristjan Tamm v Yan Bondarevskiy | 4-6,2-6 |
| ITF M15 Sibenik | 2021/04/21 07:55 | Kyrian Jacquet v Kristjan Tamm | 3-6,6-1,6-4 |
| ITF M25 Vale Do Lobo | 2021/03/10 15:10 | Kaichi Uchida v Kristjan Tamm | 3-6,6-1,6-0 |
| ITF M15 Cundinamarca | 2021/11/21 18:30 | Daniel Antonio Nunez v Michel Vernier | 3-6,6-3,1-6 |
| ITF M15 Cundinamarca | 2021/11/20 15:00 | Alejandro H Franco v Daniel Antonio Nunez | 4-6,4-6 |
| ITF M15 Cundinamarca | 2021/11/19 14:30 | Federico Agustin Gomez v Daniel Antonio Nunez | 4-6,4-6 |
| ITF M15 Cundinamarca | 2021/11/18 16:30 | Gonzalo Bueno v Daniel Antonio Nunez | 7-5,3-6,6-7 |
| ITF M15 Cundinamarca | 2021/11/17 16:30 | Nicolas Cortes Campos v Daniel Antonio Nunez | 3-6,1-6 |
| Challenger Santiago | 2021/10/11 15:40 | Daniel Antonio Nunez v Rafael Matos | 4-6,6-7 |
| Challenger Santiago | 2021/10/03 14:00 | Oliver Crawford v Daniel Antonio Nunez | 7-5,6-2 |
| ITF M25 Medellin | 2021/09/16 16:25 | Daniel Antonio Nunez v Joao Lucas Reis da Silva | 5-7,4-6 |