Stadium: Court 10 Round: 25 Ground: Synthetic outdoor
| 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 Turkey F7 | 2018/02/19 08:00 | Yuto Sakai v Kazuki Shimizu | 6-2,6-3 |
| ITF Turkey F7 | 2018/02/18 11:30 | Christian Samuelsson v Kazuki Shimizu | 6-3,3-6,4-6 |
| ITF China F6 | 2018/05/16 02:00 | Jumpei Yamasaki v Kento Takeuchi | 4-6,6-4,6-7 |
| ITF China F6 | 2018/05/14 05:45 | Huixin Wang v Jumpei Yamasaki | 3-6,3-6 |
| ITF China F5 | 2018/05/12 03:00 | Jumpei Yamasaki v Rigele Te | 3-6,6-7 |
| ITF China F5 | 2018/05/11 06:05 | Jumpei Yamasaki v Kuan-Yi Lee | 6-4,6-4 |
| ITF China F5 | 2018/05/10 03:00 | Cheong-Eui Kim v Jumpei Yamasaki | 2-6,5-7 |
| ITF China F5 | 2018/05/09 02:00 | Weibowen Zou v Jumpei Yamasaki | 0-6,0-6 |
| ITF Vietnam F1 | 2018/05/03 03:00 | Chun Hsin Tseng v Jumpei Yamasaki | 6-2,6-3 |
| ITF Vietnam F1 | 2018/05/02 03:00 | Niki Kaliyanda Poonacha v Jumpei Yamasaki | 4-6,6-3,1-6 |