Stadium: Center A Round: 27 Ground: Hardcourt outdoor
| ITF M25 Kashiwa | 2023/04/05 04:30 | Shuichi Sekiguchi v Tatsuma Ito | 4-6,6-3,7-5 |
| ITF M25 Lucknow | 2023/03/22 04:00 | Shuichi Sekiguchi v Karan Singh | 3-6,4-6 |
| ITF M25 New Delhi | 2023/03/16 05:30 | Yunseok Jang v Shuichi Sekiguchi | 2-6,7-5,6-3 |
| ITF M25 New Delhi | 2023/03/15 09:55 | Woobin Shin v Shuichi Sekiguchi | 7-5,5-7,3-6 |
| ITF M15 Aktobe | 2023/03/02 09:25 | Federico Bertuccioli v Shuichi Sekiguchi | 7-6,4-6,4-4 |
| ITF M15 Aktobe | 2023/03/01 09:55 | Adrian Oetzbach v Shuichi Sekiguchi | 3-6,4-6 |
| ITF M25 Burnie | 2023/02/09 00:50 | Adam Walton v Shuichi Sekiguchi | 6-1,6-7,7-6 |
| ITF M25 Burnie | 2023/02/08 04:00 | Shuichi Sekiguchi v Corey Gaal | 6-2,7-5 |
| ITF M15 Monastir | 2023/05/17 12:35 | Robin Bertrand v Hikaru Shiraishi | 7-5,2-6,6-4 |
| ITF M15 Monastir | 2023/05/16 08:00 | Hikaru Shiraishi v Antoni Fabre | 7-6,6-3 |
| ITF M15 Monastir | 2023/05/15 12:30 | Hikaru Shiraishi v Hillel Rousseau | 6-4,6-3 |
| ITF M15 Monastir | 2023/05/14 08:30 | Hikaru Shiraishi v Mehdi Benchakroun | 6-1,6-3 |
| ITF M15 Monastir | 2023/05/10 10:40 | Hikaru Shiraishi v Eliakim Coulibaly | 6-0,6-7,4-6 |
| ITF M15 Monastir | 2023/05/05 09:55 | Hikaru Shiraishi v Omni Kumar | 5-7,5-7 |
| ITF M15 Monastir | 2023/05/04 10:20 | Hikaru Shiraishi v Michal Mikula | 7-6,6-1 |
| ITF M15 Monastir | 2023/05/02 11:20 | Alessandro Coccioli v Hikaru Shiraishi | 3-6,2-6 |