Stadium: Court 3 Round: 62 Ground: Hardcourt outdoor
| ITF M15 - Jakarta | 2023/06/27 05:00 | Koki Matsuda v Issei Okamura | 6-3,7-6 |
| ITF M25 - Kashiwa | 2023/04/03 01:00 | Koki Matsuda v Issei Okamura | 1-6,2-6 |
| UTR Pro Kawaguchi | 2024/03/03 02:00 | Koki Matsuda v Tomohiro Masabayashi | 6-1,1-6,3-6 |
| ITF M15 - Yanagawa | 2023/12/27 02:15 | Koki Matsuda v Sora Fukuda | 2-6,6-1,2-6 |
| ITF M15 - Yanagawa | 2023/12/21 08:45 | Koki Matsuda v Jumpei Yamasaki | 1-6,6-1,3-6 |
| ITF M15 - Yanagawa | 2023/12/20 07:45 | Daisuke Sumizawa v Koki Matsuda | 5-7,3-6 |
| ITF M15 - Yanagawa | 2023/12/20 02:30 | Koki Matsuda v Hong-Lin Fu | 6-4,6-4 |
| ITF M15 - Yanagawa | 2023/12/18 01:00 | Koki Matsuda v Kai-I Wang | 6-4,7-6 |
| Challenger Yokkaichi | 2023/11/26 01:00 | Koki Matsuda v James Trotter | 1-6,1-6 |
| ITF M25 - Mumbai | 2023/11/22 07:15 | Aryan Shah v Koki Matsuda | 6-3,7-5 |
| ITF M15 - Hinode | 2024/03/11 01:00 | Yudai Umeoka v Issei Okamura | 3-6,6-7 |
| ITF M25 - Traralgon | 2024/02/27 01:05 | Jesse Delaney v Issei Okamura | 6-4,6-4 |
| ITF M25 - Traralgon | 2024/02/26 01:30 | Winter Meagher v Issei Okamura | 2-6,2-6 |
| ITF M25 - Traralgon | 2024/02/20 23:00 | Issei Okamura v Matt Hulme | 6-1,3-6,3-6 |
| ITF M25 - Traralgon | 2024/02/20 00:25 | Yuta Kikuchi v Issei Okamura | 1-6,7-5,6-10 |
| ITF M25 - Traralgon | 2024/02/18 23:00 | Cooper Errey v Issei Okamura | 4-6,6-7 |
| ITF M25 - Doha | 2024/01/17 13:05 | Issei Okamura v Ali Habib | 3-6,2-6 |
| ITF M25 - Doha | 2024/01/16 12:00 | Saba Purtseladze v Issei Okamura | 4-6,5-7 |