Stadium: Court 4 Round: 62 Ground: Hardcourt outdoor
| ITF M15 - Kashiwa | 2019/04/02 05:50 | Taisei Ichikawa v Issei Okamura | 7-5,5-7,5-7 |
| ITF Hong Kong F3 | 2018/12/24 02:00 | Issei Okamura v Taisei Ichikawa | 6-2,7-5 |
| ITF - M15 Sharm El Sheikh | 2020/11/09 10:30 | Andres Gabriel Ciurletti v Issei Okamura | 4-6,6-4,11-9 |
| ITF - M15 Sharm El Sheikh | 2020/11/08 12:30 | Shahar Gabay v Issei Okamura | 0-6,1-6 |
| ITF - M15 Sharm El Sheikh | 2020/11/03 08:00 | Marat Deviatiarov v Issei Okamura | 6-0,6-1 |
| ITF - M15 Sharm El Sheikh | 2020/11/02 08:00 | Alec Beckley v Issei Okamura | 3-6,2-6 |
| ITF - M15 Sharm El Sheikh | 2020/11/01 08:00 | Leo Borg v Issei Okamura | 1-6,4-6 |
| ITF - M15 Sharm El Sheikh | 2020/10/25 10:00 | Issei Okamura v Max Houkes | 2-6,6-4,5-10 |
| ITF - M15 Sharm El Sheikh | 2020/10/18 09:00 | Issei Okamura v Max Houkes | 6-7,6-2,5-10 |
| ITF - M15 Sintra | 2020/09/13 10:00 | Arnaud Bovy v Issei Okamura | 6-0,6-0 |
| ITF - M15 Cairo | 2021/01/26 08:00 | Taisei Ichikawa v Keisuke Saitoh | 2-6,5-7 |
| ITF - M15 Cairo | 2021/01/25 10:30 | Taisei Ichikawa v Mohamed Hesham | 6-0,6-0 |
| ITF - M15 Cairo | 2021/01/24 09:30 | Taisei Ichikawa v Maik Steiner | 6-4,6-4 |
| ITF - M15 Cairo | 2021/01/17 08:00 | Rimpei Kawakami v Taisei Ichikawa | 2-6,6-2,10-6 |
| ITF - M15 Cairo | 2021/01/11 09:00 | Dhruv Sunish v Taisei Ichikawa | 5-7,6-4,10-5 |
| ITF - M15 Nonthaburi | 2019/11/26 07:20 | Taisei Ichikawa v Ji Sung Nam | 5-7,2-6 |
| Challenger - Kobe | 2019/11/07 02:00 | Yosuke Watanuki v Taisei Ichikawa | 6-2,6-1 |
| Challenger - Kobe | 2019/11/06 04:45 | Taisei Ichikawa v Enrique Lopez-Perez | 5-7,6-2,7-6 |