Round: 44 Ground: Hardcourt outdoor
| ITF Japan F1 | 2018/03/07 04:45 | Issei Okamura v Shinji Hazawa | 6-3,1-6,3-6 |
| ITF China F3 | 2018/01/25 05:15 | Issei Okamura v Tsung-Hua Yang | 3-6,1-6 |
| ITF China F3 | 2018/01/24 05:30 | Issei Okamura v Cing-Yang Meng | 7-6,6-2 |
| ITF China F3 | 2018/01/23 02:30 | Yan Bai v Issei Okamura | 1-6,0-6 |
| ITF China F2 | 2018/01/18 02:30 | Issei Okamura v Goran Markovic | 6-2,0-6,5-7 |
| ITF China F2 | 2018/01/16 03:40 | Hu Liu v Issei Okamura | 7-5,4-6,2-6 |
| ITF China F1 | 2018/01/11 02:30 | Ryota Tanuma v Issei Okamura | 6-1,6-2 |
| ITF China F1 | 2018/01/09 04:50 | Issei Okamura v Lingxi Zhao | 3-6,6-3,6-4 |
| ITF Japan F1 | 2018/03/04 01:00 | Jack Murray v Yasunori Hashikawa | 6-2,6-2 |
| ITF Japan F1 | 2018/03/03 01:00 | Yasunori Hashikawa v Kenta Kurita | 6-2,6-4 |