Stadium: C Round: 62 Ground: Clay
| ITF Tunisia F21 | 2018/05/27 09:00 | Kato, Daiki v Chaudhry, Shamael | 2-6,3-6 |
| ITF Tunisia F20 | 2018/05/19 09:00 | Ferreira, Goncalo v Kato, Daiki | 7-6,6-3 |
| Tunisia F14, Singles Qualifying | 2018/04/11 11:50 | Jankovits, Yannick v Kato, Daiki | 6-3,6-2 |
| ITF Tunisia F13 | 2018/04/01 09:00 | Bessire, Andrea v Kato, Daiki | 6-2,6-1 |
| ITF Tunisia F5 | 2018/02/05 08:00 | Kato, Daiki v Jandric, Darko | 0-6,1-6 |
| ITF Tunisia F5 | 2018/02/04 08:00 | Kato, Daiki v Quadri , Fayyaz Hussain | 6-3,6-2 |
| Tunisia F4, Singles Qualifying | 2018/01/27 09:30 | Kato, Daiki v Wojcik, Yann | 3-6,5-7 |
| Tunisia F3, Singles Qualifying | 2018/01/21 11:00 | Wakita, Shunsuke v Kato, Daiki | 6-1,6-0 |
| ITF Japan F3 | 2018/03/17 00:30 | Watanuki, Keisuke v Numajiri, Keisuke | 3-6,1-6 |
| ITF Japan F1 | 2018/03/04 03:00 | Numajiri, Keisuke v Sasai, Masaki | 1-6,6-3,0-6 |
| Turkey F8, Singles Qualifying | 2018/02/24 09:30 | Numajiri, Keisuke v Davydov, Ivan | 1-6,7-6,5-7 |
| ITF Turkey F7 | 2018/02/17 06:30 | Bogdan Bobrov v Numajiri, Keisuke | 6-3,6-2 |
| ITF Vietnam F3 | 2017/11/21 06:10 | Katayama, Sho v Numajiri, Keisuke | 6-4,6-4 |
| ITF Vietnam F3 | 2017/11/20 04:00 | Lawrence Bataljin v Numajiri, Keisuke | 6-4,2-6,6-3 |
| ITF Vietnam F2 | 2017/11/12 04:00 | Jakub Paul v Numajiri, Keisuke | 6-7,6-4,6-1 |
| ITF Malaysia F3 | 2017/10/29 00:00 | Ito, Yuichi v Numajiri, Keisuke | 6-4,6-2 |