| 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 |
| UTR Pro Suita | 2024/04/28 02:00 | Shion Itsusaki v Seiya Nakanishi | 6-4,6-4 |
| UTR Pro Suita | 2024/04/27 00:30 | Wakamatsu Taichi v Seiya Nakanishi | 3-6,7-6,5-7 |
| UTR Pro Taipei | 2024/06/15 01:00 | Maxime Mareschal-Hay v Payton Jim on | 6-2,6-0 |
| UTR Pro Taipei | 2024/06/14 06:30 | Payton Jim on v Yang Tsung-Hua | 4-4 |
| UTR Pro Taipei | 2024/06/11 03:36 | Payton Jim on v Paul Wang | 1-6,6-1,3-2 |
| UTR Pro Taipei | 2024/06/10 04:00 | Aditya Vishal Balsekar v Payton Jim on | 6-1,6-2 |