Ground: Hardcourt outdoor
| UTR Pro Suita | 2024/04/24 02:31 | Ryotaro Matsumura v Seiya Nakanishi | 6-4,6-0 |
| ITF M25 Takasaki | 2023/09/17 01:00 | Ryotaro Matsumura v Seiya Nakanishi | 6-2,6-4 |
| ITF M15 Karuizawa | 2024/06/01 02:20 | Tomohiro Masabayashi v Ryotaro Matsumura | 6-0,6-2 |
| ITF M15 Karuizawa | 2024/05/30 03:20 | Ryotaro Matsumura v Kazuki Nishiwaki | 6-4,6-2 |
| ITF M15 Karuizawa | 2024/05/29 02:00 | Ryotaro Matsumura v Taiyo Yamanaka | 6-3,4-6,12-10 |
| ITF M25 Anning | 2024/05/21 04:30 | Ryotaro Matsumura v Nico Hornitschek | 3-6,1-6 |
| ITF M25 Anning | 2024/05/20 06:00 | Ryotaro Matsumura v Min Seong Kim | 6-3,6-1 |
| ITF M25 Anning | 2024/05/19 01:30 | Ryotaro Matsumura v Xirui Han | 7-5,6-3 |
| ITF M25 Luan | 2024/05/15 03:25 | Ryotaro Matsumura v Fajing Sun | 3-6,1-6 |
| ITF M25 Luan | 2024/05/13 04:45 | Ryotaro Matsumura v Hao Duan | 6-2,6-0 |
| UTR Pro Kawaguchi | 2024/06/19 00:00 | Taiyo Kurata v Seiya Nakanishi | 3-6,4-6 |
| UTR Pro Kawaguchi | 2024/06/17 02:41 | Seiya Nakanishi v Payton Jim on | 6-0,6-3 |
| ITF M15 Harmon | 2024/06/03 00:00 | Geni Inoue v Seiya Nakanishi | 6-1,6-1 |
| ITF M15 Harmon | 2024/06/02 00:00 | Babji Siva Atturu v Seiya Nakanishi | 1-6,2-6 |
| UTR Pro Urayasu | 2024/05/11 00:00 | Yuki Mochizuki v Seiya Nakanishi | 6-4,6-4 |
| UTR Pro Urayasu | 2024/05/09 03:00 | Kazuki Saito v Seiya Nakanishi | 4-6,2-6 |
| UTR Pro Urayasu | 2024/05/09 01:30 | Hiiro Sakamoto v Seiya Nakanishi | 7-6,7-6 |
| UTR Pro Urayasu | 2024/05/06 02:15 | Toa Maeda v Seiya Nakanishi | 3-6,1-6 |