Stadium: Court 3 Round: 62 Ground: Clay
| 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 Japan F3 | 2018/03/17 04:00 | Soichiro Moritani v Kazuki Shimizu | 6-2,6-3 |
| ITF Japan F1 | 2018/03/03 05:30 | Kazuki Shimizu v Masaki Sasai | 3-6,2-6 |
| ITF Japan F8 | 2018/06/09 01:00 | Akito Higa v Kyohei Yamanaka | 2-6,2-6 |
| ITF Japan F7 Qual | 2018/06/03 02:50 | Ryota Kishi v Kyohei Yamanaka | 6-1,6-2 |
| ITF Japan F7 Qual | 2018/06/02 01:00 | Kyohei Yamanaka v Christopher Cajigan | 7-6,6-0 |