Stadium: Court 8 Round: 25 Ground: Hardcourt outdoor
| ITF M15 Cancun | 2021/12/09 14:00 | Christian Langmo v Kristjan Tamm | 6-4,6-0 |
| ITF M15 Cancun | 2021/12/07 16:00 | Dusty H. Boyer v Kristjan Tamm | 4-6,3-6 |
| ITF M15 Cancun | 2021/12/04 14:00 | Rubin Statham v Kristjan Tamm | 6-7,7-6,10-7 |
| ITF M15 Cancun | 2021/11/30 16:00 | Mwendwa Mbithi v Kristjan Tamm | 6-7,6-7 |
| 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 M15 Cancun | 2021/12/08 16:35 | Evan Zhu v Tristan McCormick | 5-7,4-6 |
| ITF M15 Cancun | 2021/11/24 14:00 | Gabriel Evans v Evan Zhu | 6-3,6-3 |
| ITF M15 Ithaca | 2021/11/03 16:40 | Evan Zhu v Osgar O'Hoisin | 6-7,3-6 |
| UTR Pro Tennis Series Dallas | 2021/09/05 14:30 | Luc Fomba v Evan Zhu | 7-6,6-7,6-5 |
| 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 16:00 | Orel Ovil v Evan Zhu | 2-6,6-4,2-6 |
| UTR Pro Tennis Series Dallas | 2021/09/02 17:30 | Ray Lo v Evan Zhu | 5-7,3-6 |
| UTR Pro Tennis Series Dallas | 2021/08/31 13:00 | Sven Lah v Evan Zhu | 6-3,0-3 |