Stadium: Court 4 Round: 54 Ground: Hardcourt outdoor
| ITF M25 Sapporo | 2024/09/09 03:30 | Shunsuke Nakagawa v Seiya Nakanishi | 6-2,6-2 |
| ITF M25 Sapporo | 2024/09/08 01:00 | Yusuke Yoshikawa v Seiya Nakanishi | 7-6,6-7,7-10 |
| ITF M25 Sapporo | 2024/09/02 02:35 | Brandon Perez v Seiya Nakanishi | 7-5,6-1 |
| UTR Pro Kawaguchi | 2024/08/18 00:00 | Seiya Nakanishi v Kazuki Sugimoto | 3-6,2-6 |
| UTR Pro Kawaguchi | 2024/08/17 00:00 | Sora Fukuda v Seiya Nakanishi | 3-6,0-6 |
| UTR Pro Kawaguchi | 2024/08/15 07:43 | Daisuke Sumizawa v Seiya Nakanishi | 6-2,6-3 |
| UTR Pro Kawaguchi | 2024/08/15 01:00 | Christopher Kosei Ono v Seiya Nakanishi | 6-7,5-7 |
| UTR Pro Kawaguchi | 2024/08/13 03:30 | Emon Van Loben Sels v Seiya Nakanishi | 6-3,6-1 |
| ITF M15 Kursumlijska Banja | 2024/07/24 12:20 | Federico Bondioli v Noritaka Koizumi | 6-1,6-2 |
| ITF M15 Kursumlijska Banja | 2024/07/23 10:30 | Gabriel Matuszewski v Noritaka Koizumi | 7-5,7-6 |
| ITF M15 Kursumlijska Banja | 2024/07/22 10:30 | Noritaka Koizumi v Paul Barbier Gazeu | 6-7,6-0,10-2 |
| ITF M15 Kursumlijska Banja | 2024/07/21 11:30 | Maties Torres Ramis v Noritaka Koizumi | 1-6,2-6 |
| ITF M15 Kursumlijska Banja | 2024/07/16 07:40 | Noritaka Koizumi v Ignacio Parisca | 2-6,3-6 |
| ITF M15 Kursumlijska Banja | 2024/07/15 09:00 | Manuel Mouilleron Salvo v Noritaka Koizumi | 4-6,1-6 |
| ITF M15 Kursumlijska Banja | 2024/07/14 06:00 | Nikola Mitrovic v Noritaka Koizumi | 4-6,1-6 |
| ITF M15 Kursumlijska Banja | 2024/07/08 06:00 | Arthur Laborde v Noritaka Koizumi | 6-0,6-3 |