Stadium: Sub-Court B Round: 26 Ground: Hardcourt outdoor
| ITF Japan F3 | 2018/03/19 01:00 | Shuichi Sekiguchi v Jumpei Yamasaki | 6-7,7-6,6-2 |
| 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 Heraklion | 2022/10/14 08:50 | Simone Roncalli v Jumpei Yamasaki | 6-4,6-3 |
| ITF M15 Heraklion | 2022/10/13 08:40 | Thantub Suksumrarn v Jumpei Yamasaki | 6-7,2-6 |
| ITF M15 Heraklion | 2022/10/12 11:40 | Gianluca Cadenasso v Jumpei Yamasaki | 6-7,3-6 |
| UTR Pro Tennis Series Miki | 2022/07/09 00:30 | Asahi Harazaki v Jumpei Yamasaki | 7-5,5-2 |
| UTR Pro Tennis Series Miki | 2022/07/08 00:30 | Yuichiro Inui v Jumpei Yamasaki | 3-6,6-3,4-6 |
| UTR Pro Tennis Series Miki | 2022/07/07 04:58 | Kento Tagashira v Jumpei Yamasaki | 4-6,3-6 |
| UTR Pro Tennis Series Miki | 2022/07/05 00:30 | Reiya Komagata v Jumpei Yamasaki | 0-6,3-6 |
| UTR Pro Tennis Series Miki | 2022/07/04 02:00 | Jumpei Yamasaki v Ryotaro Matsumura | 6-4,6-2 |