| UTR Pro Noda | 2023/10/22 01:30 | Yuto Okuchi v Masaya Yufu | 6-3,6-2 |
| UTR Pro Noda | 2023/10/21 07:40 | Yuto Okuchi v Kusunoki Haruto | 6-3,4-6,6-1 |
| UTR Pro Noda | 2023/10/20 05:41 | Chaitanya Irkar v Yuto Okuchi | 4-6,6-3,3-5 |
| UTR Pro Noda | 2023/10/19 00:00 | Kazuma Kawachi v Yuto Okuchi | 6-4,6-7,6-0 |
| UTR Pro Noda | 2023/10/17 00:00 | Sota Tani v Yuto Okuchi | 7-6,3-6,6-4 |
| UTR Pro Noda | 2023/10/16 05:00 | Yuto Okuchi v Natsuki Yamamoto | 2-6,3-6 |
| UTR Pro Osaka | 2023/07/30 00:30 | Brody Nejedly-Krall v Yuto Okuchi | 4-6,6-6 |
| UTR Pro Osaka | 2023/07/28 00:30 | Yuto Okuchi v Jake Bhangdia | 0-6,6-7 |
| UTR Pro Suita | 2024/04/24 02:31 | Ryotaro Matsumura v Seiya Nakanishi | 6-4,6-0 |
| UTR Pro Suita | 2024/04/22 04:59 | Taketo Takamisawa v Seiya Nakanishi | 6-4,4-6,7-5 |
| ITF M15 Hinode | 2024/03/11 04:45 | Seiya Nakanishi v Shunsuke Nakagawa | 4-6,2-6 |
| ITF M15 Hinode | 2024/03/11 01:00 | Jumpei Yamasaki v Seiya Nakanishi | 5-7,6-4,8-10 |
| ITF M15 Yanagawa | 2023/12/25 00:30 | Kazuma Kawachi v Seiya Nakanishi | 6-3,6-0 |
| ITF M25 Takasaki | 2023/09/17 01:00 | Ryotaro Matsumura v Seiya Nakanishi | 6-2,6-4 |
| ITF M25 Sapporo | 2023/09/05 04:15 | Issei Okamura v Seiya Nakanishi | 6-1,6-1 |
| ITF M25 Sapporo | 2023/09/04 03:35 | Ryusuke Horiuchi v Seiya Nakanishi | 6-4,2-6,10-12 |