Stadium: Court 2 Round: 25 Ground: Clay
| ITF M25 - Kiseljak | 2021/05/26 15:30 | Gilbert S K Junior v David Pichler | 4-6,3-6 |
| ITF M15 - Brcko | 2021/05/21 09:00 | Gilbert S K Junior v Eric Vanshelboim | 6-2,4-6,0-6 |
| ITF M15 - Prijedor | 2021/05/11 12:35 | Luca Giacomini v Gilbert S K Junior | 6-3,1-6,6-1 |
| ITF - M15 - Monastir | 2021/04/30 08:25 | Yunseong Chung v Gilbert S K Junior | 6-2,3-6,6-1 |
| ITF - M15 - Monastir | 2021/04/29 08:30 | Gilbert S K Junior v Zachary Svajda | 2-6,6-4,6-3 |
| ITF - M15 - Monastir | 2021/04/27 08:30 | Gilbert S K Junior v Filip Bergevi | 6-1,6-2 |
| ITF - M15 - Monastir | 2021/04/21 08:30 | Gilbert S K Junior v Alexander Donski | 4-6,6-4,3-6 |
| ITF - M15 - Monastir | 2021/04/16 08:30 | Eliakim Coulibaly v Gilbert S K Junior | 7-5,6-4 |
| 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 M25 - Faro | 2021/02/28 15:00 | Kristjan Tamm v Rayane Oumaouche | 4-6,7-5,1-10 |
| ITF M25 - Vale Do Lobo | 2021/02/24 15:15 | Kristjan Tamm v Gastao Elias | 4-6,4-6 |
| ITF - M15 - Monastir | 2020/12/13 08:30 | Kristjan Tamm v Artem Dubrivnyy | 4-6,6-3,6-3 |