Stadium: Court 6 Round: 25 Ground: Hardcourt outdoor
| ITF M15 Cancun | 2021/11/25 17:00 | Alan F R Fierros v Mwendwa Mbithi | 7-6,6-2 |
| ITF M15 Cancun | 2021/11/23 14:00 | Lucca Pinto v Mwendwa Mbithi | 0-6,2-6 |
| ITF M15 Cancun | 2021/10/23 15:00 | Victor Lilov v Mwendwa Mbithi | 6-2,6-1 |
| ITF M15 Cancun | 2021/10/22 15:00 | Mwendwa Mbithi v Gerardo L Villasenor | 6-3,3-6,6-3 |
| ITF M15 Cancun | 2021/10/21 14:00 | Mwendwa Mbithi v Samuel Sanchez | 7-6,6-2 |
| ITF M15 Cancun | 2021/10/20 15:00 | Mwendwa Mbithi v Luciano Doria | 6-1,6-3 |
| ITF M15 Cancun | 2021/10/12 15:30 | Matias Franco Descotte v Mwendwa Mbithi | 6-4,6-3 |
| ITF M15 Cancun | 2021/10/06 16:30 | Mwendwa Mbithi v Juan A H Serrano | 3-6,2-6 |
| ITF M15 Cancun | 2021/11/23 14:00 | Kristjan Tamm v Daniel Antonio Nunez | 6-4,2-6,6-7 |
| 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 |