Stadium: Center Court Round: 25 Ground: Hardcourt outdoor
| ITF M15 Changwon | 2022/08/25 03:05 | Issei Okamura v Duckhee Lee | 6-2,3-6,7-5 |
| ITF Japan F6 | 2015/06/11 01:00 | Issei Okamura v Duckhee Lee | 1-6,4-6 |
| ITF M15 Changwon | 2022/08/25 03:05 | Issei Okamura v Duckhee Lee | 6-2,3-6,7-5 |
| ITF M15 Changwon | 2022/08/24 08:20 | Woobin Shin v Duckhee Lee | 3-6,2-6 |
| Jakarta, Singles Main, M-ITF-INA-02A | 2022/08/12 02:00 | Mukund Sasikumar v Duckhee Lee | 6-0,6-1 |
| Jakarta, Singles Main, M-ITF-INA-02A | 2022/08/11 03:45 | Takuya Kumasaka v Duckhee Lee | 2-6,1-6 |
| Jakarta, Singles Main, M-ITF-INA-02A | 2022/08/09 03:35 | Achad Imam Maruf v Duckhee Lee | 2-6,4-6 |
| Kuching, Singles Main, M-ITF-MAS-03A | 2022/08/04 04:30 | Tomohiro Masabayashi v Duckhee Lee | 6-7,6-3,6-0 |
| Kuching, Singles Main, M-ITF-MAS-03A | 2022/08/03 01:00 | Takeuchi, Kento (1987) v Duckhee Lee | 4-6,4-6 |
| ITF M15 Kuala Lumpur | 2022/07/27 04:35 | Duckhee Lee v Takeuchi, Kento (1987) | 6-4,7-5 |
| ITF M15 Changwon | 2022/08/26 00:55 | Ajeet Rai v Issei Okamura | 6-1,6-7,6-3 |
| ITF M15 Changwon | 2022/08/25 03:05 | Issei Okamura v Duckhee Lee | 6-2,3-6,7-5 |
| ITF M15 Changwon | 2022/08/23 01:00 | Issei Okamura v Min Seong Kim | 6-4,6-0 |
| Jakarta, Singles Main, M-ITF-INA-02A | 2022/08/15 04:45 | Issei Okamura v Amor Jasika | 3-6,4-6 |
| ITF M15 Jakarta Qual | 2022/08/14 03:55 | Issei Okamura v Hobbs, Roy | 6-4,6-4 |
| Jakarta, Singles Main, M-ITF-INA-02A | 2022/08/10 03:40 | Issei Okamura v Shintaro Imai | 0-6,1-6 |
| Jakarta, Singles Main, M-ITF-INA-02A | 2022/08/09 02:00 | Anthony Susanto v Issei Okamura | 1-6,5-7 |
| Jakarta, Singles Main, M-ITF-INA-02A | 2022/08/08 05:20 | Huynh, Phuc v Issei Okamura | 1-6,6-4,4-10 |