Stadium: KPI Park - Court 02 Round: 28 Ground: Hardcourt outdoor
Referee:
| ITF M15 Tanagura | 2025/10/22 00:30 | Ryusuke Horiuchi v Shunsuke Nakagawa | 6-7,2-6 |
| ITF M15 Tokyo | 2025/07/08 01:00 | Yuto Oki v Ryusuke Horiuchi | 6-3,6-4 |
| ITF M15 Luan | 2025/06/09 06:00 | Ryusuke Horiuchi v Emiliano Jorquera | 6-4,3-6,0-1 |
| ITF M15 Luan | 2025/06/04 08:00 | Xing Dao Chen v Ryusuke Horiuchi | 6-4,6-7,6-4 |
| ITF M15 Luan | 2025/04/09 03:30 | Fajing Sun v Ryusuke Horiuchi | 6-2,6-1 |
| ITF M15 Nishi-Tokyo | 2025/03/18 04:00 | Moerani Bouzige v Ryusuke Horiuchi | 6-1,6-1 |
| ITF M15 Hinode | 2025/03/13 01:00 | Ryusuke Horiuchi v Daisuke Sumizawa | 2-6,2-6 |
| UTR Pro Yokohama | 2024/12/01 02:19 | Ryusuke Horiuchi v Kai Kawano | 3-6,2-6 |
| UTR Pro Kawaguchi | 2025/10/02 03:55 | Natsuki Yamamoto v Yuki Karatsu | 3-6,6-3,6-3 |
| UTR Pro Kawaguchi | 2025/10/01 23:55 | Natsuki Yamamoto v Mattias Southcombe | 6-1,6-3 |
| UTR Pro Kawaguchi | 2025/09/30 01:00 | Natsuki Yamamoto v Ryota Tanuma | 0-6,0-6 |
| UTR Pro Kawaguchi | 2025/09/29 01:00 | Natsuki Yamamoto v Kohtaro Kuriyama | 6-7,6-2,7-6 |
| ITF M25 Sapporo | 2025/09/08 04:30 | Mark Whitehouse v Natsuki Yamamoto | 6-4,5-3 |
| ITF M25 Sapporo | 2025/09/01 02:30 | Naoki Tajima v Natsuki Yamamoto | 6-1,6-1 |
| UTR Pro Yokohama | 2025/08/23 01:05 | Natsuki Yamamoto v Daiki Yoshimura | 6-7,1-6 |
| UTR Pro Yokohama | 2025/08/22 00:00 | Natsuki Yamamoto v Semen Batin | 6-4,1-6,6-2 |