Stadium: Alpha Round: 25 Ground: Hardcourt outdoor
| ITF M15 Tsukuba | 2019/03/27 03:25 | Issei Okamura v Naoki Tajima | 3-6,4-6 |
| ITF M15 Anning | 2019/01/10 04:30 | Issei Okamura v Naoki Tajima | 6-4,3-6,4-6 |
| ITF M15 Karuizawa | 2024/05/27 01:00 | Issei Okamura v Yusuke Kusuhara | 3-6,6-3,2-10 |
| ITF M15 Karuizawa | 2024/05/26 01:00 | Issei Okamura v Antoine Voisin | 6-1,6-1 |
| ITF M25 Addis Ababa | 2024/05/21 08:05 | Issei Okamura v Kabir Hans | 4-6,1-6 |
| ITF M15 Addis Ababa | 2024/05/13 09:30 | Issei Okamura v Dharmil Shah | 6-7,3-6 |
| ITF M15 Kashiwa | 2024/03/31 01:00 | Yeongseok Jeong v Issei Okamura | 6-2,7-6 |
| ITF M15 Tsukuba | 2024/03/24 01:00 | Issei Okamura v Masamichi Imamura | 6-7,6-7 |
| ITF M15 Nishi-Tokyo | 2024/03/18 03:30 | Jumpei Yamasaki v Issei Okamura | 6-2,6-1 |
| ITF M15 Hinode | 2024/03/11 04:30 | Koki Matsuda v Issei Okamura | 6-4,6-3 |
| ITF M15 Karuizawa | 2024/05/29 02:00 | Kokoro Isomura v Naoki Tajima | 6-2,6-1 |
| ITF M15 Antalya | 2024/05/02 07:00 | Naoki Tajima v Andrin Casanova | 3-6,6-7 |
| ITF M15 Antalya | 2024/04/30 09:20 | Naoki Tajima v Mubarak Shannan Zayid | 6-4,6-1 |
| ITF M15 Antalya | 2024/04/25 08:40 | Naoki Tajima v Deney Wassermann | 1-6,7-6,1-6 |
| ITF M15 Antalya | 2024/04/24 10:00 | Fedor Sosedkin v Naoki Tajima | 2-6,0-6 |
| ITF M15 Kashiwa | 2024/04/01 02:40 | Daisuke Sumizawa v Naoki Tajima | 4-6,6-1,10-8 |
| ITF M15 Kashiwa | 2024/03/31 01:00 | Kenta Nakamura v Naoki Tajima | 2-6,2-6 |
| ITF M15 Tsukuba | 2024/03/24 01:00 | Ryotaro Shimomura v Naoki Tajima | 6-3,1-6,10-5 |