Estadio: Court 15 Round: 25 Ground: Hardcourt outdoor
| ITF M15 Karuizawa | 2023/06/04 02:00 | Yuta Kawahashi v Tatsuma Ito | 7-5,6-2 |
| ITF M15 Karuizawa | 2023/06/03 07:00 | Sora Fukuda v Tatsuma Ito | 6-7,6-7 |
| ITF M15 Karuizawa | 2023/06/03 03:30 | Kazuma Kawachi v Tatsuma Ito | 1-6,4-6 |
| ITF M15 Karuizawa | 2023/06/01 03:20 | Preston Brown v Tatsuma Ito | 3-6,0-6 |
| ITF M15 Karuizawa | 2023/05/31 03:35 | Seon Yong Han v Tatsuma Ito | 6-7,3-6 |
| Challenger de Busan | 2023/05/08 03:40 | Yuki Mochizuki v Tatsuma Ito | 6-4,4-6,6-2 |
| Challenger de Busan | 2023/05/07 02:30 | Tatsuma Ito v Mukund Sasikumar | 5-7,6-4,6-4 |
| Challenger Gwangju | 2023/05/01 01:30 | Tatsuma Ito v Peter Gojowczyk | 4-6,4-6 |
| ITF M25 Changwon | 2023/06/12 04:30 | Naoki Tajima v Hyun Woo Cho | 6-1,6-0 |
| ITF M25 Changwon | 2023/06/12 00:55 | Naoki Tajima v Seonghun Kim | 6-4,6-0 |
| ITF M25 Changwon | 2023/06/11 04:25 | Naoki Tajima v Je Won Jeon | 6-1,6-1 |
| ITF M15 Karuizawa | 2023/05/30 03:30 | Ryotaro Matsumura v Naoki Tajima | 3-6,6-1,6-4 |
| ITF M25 Jakarta | 2023/04/25 04:15 | Naoki Tajima v Credit Chaiyarin | 7-5,3-6,8-10 |
| ITF M25 Jakarta | 2023/04/24 06:30 | Naoki Tajima v Arsya Philo Wisyesa Putra Sjarifuddin | 6-0,6-0 |
| ITF M25 Jakarta | 2023/04/17 07:00 | Naoki Tajima v Andrew Rogers | 6-7,4-6 |
| ITF M25 Jakarta - Clasificación | 2023/04/16 04:40 | Pruchya Isarow v Naoki Tajima | 6-2,3-6,8-10 |