Stadium: Court 2 Round: 25 Ground: Hardcourt outdoor
| ITF Japan F2 | 2018/03/12 00:30 | Issei Okamura v Itsusaki, Kaito | 6-4,6-1 |
| ITF Japan F2 | 2018/03/11 00:30 | Issei Okamura v Hashikawa, Yasunori | 6-2,6-1 |
| 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 Yang, Tsung-Hua | 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 Markovic, Goran | 6-2,0-6,5-7 |
| ITF China F2 | 2018/01/16 03:40 | Liu, Hu v Issei Okamura | 7-5,4-6,2-6 |
| ITF Turkey F4 | 2018/01/29 08:00 | Melnic, Vladislav v Kawakami, Rimpei | 7-5,6-3 |
| ITF Turkey F3 | 2018/01/23 11:30 | Zgombic, Fran Zvonimir v Kawakami, Rimpei | 6-4,6-1 |
| ITF Turkey F3 | 2018/01/22 10:00 | Kawakami, Rimpei v Alekseenko, Vadim | 6-2,6-1 |
| ITF Turkey F3 | 2018/01/20 07:00 | Solomatin, Igor v Kawakami, Rimpei | 0-6,1-6 |
| ITF Turkey F2 | 2018/01/15 07:00 | Kawakami, Rimpei v Manda, Calin | 6-7,6-2,1-6 |
| ITF Turkey F1 | 2018/01/07 10:00 | Matteo Martineau v Kawakami, Rimpei | 6-1,6-1 |
| ITF Turkey F1 | 2018/01/06 08:00 | Evloev, T. v Kawakami, Rimpei | 0-6,3-6 |
| ITF Vietnam F1 | 2017/11/05 05:00 | Rio Noguchi v Kawakami, Rimpei | 5-7,6-1,6-4 |