Stadium: Court 5 Round: 25 Ground: Clay
| ITF M25 - Malibu | 2023/01/02 17:00 | Rei Sakamoto v Arthur Neuhaus | 1-6,2-6 |
| ITF - M15 Antalya | 2022/10/26 11:25 | Dan Alexandru Tomescu v Rei Sakamoto | 4-6,6-4,6-2 |
| ITF - M15 Antalya | 2022/10/19 07:00 | Rei Sakamoto v Savva Polukhin | 3-6,2-6 |
| ITF - M15 Albuquerque | 2022/09/30 20:25 | Rei Sakamoto v Maciej Rajski | 2-6,3-6 |
| ITF - M15 Albuquerque | 2022/09/29 15:00 | Yuta Kikuchi v Rei Sakamoto | 2-6,2-6 |
| ITF - M15 Albuquerque | 2022/09/27 19:35 | Rei Sakamoto v Arda Azkara | 4-6,6-0,7-6 |
| ITF M15 Lubbock | 2022/09/20 19:15 | Demetris Azoides v Rei Sakamoto | 3-6,6-1,6-1 |
| ITF - M15 Champaign | 2022/09/17 19:30 | Sekou Bangoura v Rei Sakamoto | 6-2,6-2 |
| Davis Cup | 2023/02/05 19:15 | Blaise Bicknell v Kristjan Tamm | 7-6,0-0 |
| Davis Cup | 2023/02/04 20:30 | Rowland Phillips v Kristjan Tamm | 6-1,6-1 |
| ITF M25 Al Zahra | 2023/01/26 07:00 | Kristjan Tamm v Sidane Pontjodikromo | 4-6,3-6 |
| ITF M25 Al Zahra | 2023/01/25 08:55 | Kristjan Tamm v Maxim Zhukov | 6-3,3-6,6-4 |
| ITF M25 - Doha | 2023/01/17 14:20 | Kristjan Tamm v Elliot Benchetrit | 4-6,6-3,1-6 |
| ITF - M15 Doha | 2023/01/15 12:00 | Kristjan Tamm v Bernard Tomic | 6-4,7-6 |
| ITF - M15 Doha | 2023/01/14 14:15 | Kristjan Tamm v Khumoyun Sultanov | 7-6,6-4 |
| ITF - M15 Doha | 2023/01/13 12:00 | Marius Copil v Kristjan Tamm | 6-7,6-7 |