Stadium: Center A Round: 25 Ground: Hardcourt outdoor
| ITF M25 Matsuyama | 2019/04/09 04:10 | Ryota Tanuma v Shuichi Sekiguchi | 4-6,4-6 |
| ITF Japan F3 | 2016/03/22 03:30 | Ryota Tanuma v Shuichi Sekiguchi | 6-4,1-6,2-6 |
| ITF - M25 Sapporo | 2023/09/10 02:00 | Shuichi Sekiguchi v Daisuke Sumizawa | 6-1,6-4 |
| ITF - M25 Sapporo | 2023/09/09 02:00 | Naoki Nakagawa v Shuichi Sekiguchi | 7-5,3-6,5-7 |
| ITF - M25 Sapporo | 2023/09/08 02:30 | Shuichi Sekiguchi v Jumpei Yamasaki | 6-4,6-3 |
| ITF - M25 Sapporo | 2023/09/07 01:00 | Shuichi Sekiguchi v Chase Ferguson | 6-2,6-2 |
| ITF - M25 Sapporo | 2023/09/05 04:20 | Shuichi Sekiguchi v Hiroki Sakagawa | 6-3,6-2 |
| Challenger - Zhangjiagang | 2023/08/28 10:15 | Shuichi Sekiguchi v Jie Cui | 1-6,2-6 |
| Challenger - Zhangjiagang | 2023/08/27 06:25 | Shuichi Sekiguchi v Francis Casey Alcantara | 7-5,6-3 |
| Challenger - Zhuhai | 2023/08/22 07:00 | Dominik Palan v Shuichi Sekiguchi | 7-6,5-7,6-2 |
| ITF - M25 Sapporo | 2023/09/07 00:50 | Kokoro Isomura v Ryota Tanuma | 6-4,6-3 |
| ITF - M25 Sapporo | 2023/09/05 02:00 | Ryota Tanuma v Yunseok Jang | 6-4,7-5 |
| Challenger - Matsuyama | 2022/11/06 01:00 | Ryota Tanuma v Naoki Nakagawa | 3-6,4-6 |
| Challenger - Yokohama | 2022/11/01 05:55 | Damir Dzumhur v Ryota Tanuma | 6-3,6-1 |
| Challenger - Yokohama | 2022/10/31 01:30 | Rimpei Kawakami v Ryota Tanuma | 6-7,6-4,4-6 |
| Challenger - Seoul | 2022/10/09 06:00 | Hamad Medjedovic v Ryota Tanuma | 6-4,6-3 |
| ATP - Tokyo | 2022/10/01 07:55 | Ryota Tanuma v Ramkumar Ramanathan | 5-7,3-6 |
| ITF - M25 Kashiwa | 2022/10/01 02:45 | Rimpei Kawakami v Ryota Tanuma | 6-3,6-2 |