Stadium: Court 6 Round: 54 Ground: Synthetic outdoor
| ITF M15 Akishima | 2019/06/11 00:00 | Masayoshi Ono v Ko Suzuki | 2-6,3-6 |
| ITF M15 Guam | 2019/06/08 00:00 | Ko Suzuki v Hiroyasu Ehara | 4-6,1-6 |
| ITF M15 Guam | 2019/06/07 00:00 | Soichiro Moritani v Ko Suzuki | 3-6,4-6 |
| ITF M15 Guam | 2019/06/06 01:20 | Ko Suzuki v Karunuday Singh | 3-6,7-6,6-3 |
| ITF M15 Guam | 2019/06/05 02:40 | Ko Suzuki v Joseph W. Van Meter | 6-2,6-4 |
| ITF M15 Karuizawa | 2019/06/02 02:00 | Ko Suzuki v Yuki Mochizuki | 4-6,6-4,2-6 |
| ITF M15 Karuizawa | 2019/06/01 02:00 | Ko Suzuki v Soichiro Moritani | 6-4,6-2 |
| ITF M15 Karuizawa | 2019/05/31 01:00 | Ko Suzuki v Goran Markovic | 6-1,6-4 |
| ITF M15 Karuizawa | 2019/05/30 04:30 | Haru Inoue v Kazuki Shimizu | 6-2,6-1 |
| ITF M15 Karuizawa | 2019/05/29 05:15 | Kazuki Shimizu v Kousuke Ogura | 7-5,5-7,6-4 |
| ITF M25 Matsuyama | 2019/04/10 03:30 | Gage Brymer v Kazuki Shimizu | 7-6,5-7,6-0 |
| ITF M25 Matsuyama | 2019/04/09 01:00 | Daisuke Sumizawa v Kazuki Shimizu | 6-3,4-6,6-10 |
| ITF M25 Matsuyama | 2019/04/08 01:00 | Kazuki Shimizu v Yuichiro Inui | 6-2,6-0 |
| ITF M15 Tsukuba | 2019/03/25 01:00 | Mick Veldheer v Kazuki Shimizu | 6-1,6-4 |
| ITF M15 Kofu | 2019/03/18 00:30 | Kazuki Shimizu v Kousuke Ogura | 6-7,5-7 |
| ITF M15 Nishi-Tama | 2019/03/05 01:00 | Kazuki Shimizu v Daisuke Sumizawa | 2-6,2-6 |