Stadium: Court 3 Round: 27 Ground: Clay
| ITF M15 Karuizawa | 2023/06/01 00:30 | Kazuma Kawachi v Ko Suzuki | 6-2,1-6,7-5 |
| ITF M15 Karuizawa | 2023/05/30 07:05 | Kazuma Kawachi v Ko Nagashima | 6-2,6-3 |
| ITF M15 Monastir | 2023/04/18 12:45 | Bogdan Bobrov v Kazuma Kawachi | 6-2,6-3 |
| ITF M15 Monastir | 2023/04/12 08:30 | Kazuma Kawachi v Koray Kirci | 1-6,1-6 |
| ITF M25 Kashiwa | 2023/04/05 01:00 | Kazuma Kawachi v Hiroki Moriya | 4-6,2-6 |
| ITF M25 Kashiwa | 2023/04/03 02:30 | Kazuma Kawachi v Shohei Chikami | 7-6,6-4 |
| ITF M15 Heraklion | 2023/03/14 11:15 | Kazuma Kawachi v Orel Kimhi | 7-6,5-7,0-6 |
| ITF M15 Aktobe | 2023/03/09 05:00 | Kazuma Kawachi v Arslanbek Aitkulov | 4-6,3-6 |
| 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 Busan | 2023/05/08 03:40 | Yuki Mochizuki v Tatsuma Ito | 6-4,4-6,6-2 |
| Challenger 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 |
| Challenger Gwangju | 2023/04/30 02:35 | Edan Leshem v Tatsuma Ito | 1-6,4-6 |
| Challenger Seoul | 2023/04/26 04:55 | Seong Chan Hong v Tatsuma Ito | 6-3,6-2 |
| Challenger Seoul | 2023/04/24 03:45 | Omar Jasika v Tatsuma Ito | 6-1,2-6,2-6 |