Stadium: Court 2 Round: 25 Ground: Clay
| ITF Japan F8 | 2018/06/11 00:30 | Ryotaro Matsumura v Kazuki Shimizu | 7-5,6-3 |
| ITF Japan F8 | 2018/06/09 05:30 | Kazuki Shimizu v Kyohei Yamanaka | 6-1,7-6 |
| ITF Japan F8 | 2018/06/09 01:00 | Winter Meagher v Kazuki Shimizu | 7-5,4-6,4-6 |
| ITF Japan F7 | 2018/06/04 03:10 | Kazuki Shimizu v Jumpei Yamasaki | 2-6,4-6 |
| ITF Japan F7 Qual | 2018/06/03 01:00 | Kazuki Shimizu v David Barclay | 6-0,6-4 |
| ITF Japan F7 Qual | 2018/06/02 01:00 | Masaya Kobayashi v Kazuki Shimizu | 6-7,3-6 |
| ITF Japan F6 Qual | 2018/04/08 04:00 | Sho Shimabukuro v Kazuki Shimizu | 6-2,6-1 |
| ITF Japan F4 | 2018/03/24 00:00 | Ryota Tanuma v Kazuki Shimizu | 6-2,6-1 |
| ITF Thailand F9 | 2018/11/11 04:30 | Kousuke Ogura v Chukang Wang | 1-6,7-5,1-6 |
| ITF Thailand F9 | 2018/11/10 05:00 | Kousuke Ogura v Nawakarn Khunjan | 6-1,6-3 |
| ITF Thailand F8 | 2018/11/03 04:30 | Alexander Donski v Kousuke Ogura | 6-1,4-6,6-2 |
| ITF Thailand F6 | 2018/10/06 05:30 | Daisuke Sumizawa v Kousuke Ogura | 6-3,6-2 |
| ITF Thailand F5 | 2018/09/30 02:30 | David Agung Susanto v Kousuke Ogura | 6-4,6-0 |
| ITF Thailand F5 | 2018/09/29 04:30 | Tianjia Guo v Kousuke Ogura | 6-4,2-6,3-6 |
| ITF Thailand F4 | 2018/09/26 05:40 | Kousuke Ogura v Pascal Meis | 2-6,3-6 |
| ITF Thailand F4 | 2018/09/24 02:30 | Ruikai Wang v Kousuke Ogura | 3-6,1-6 |