Stadium: Court 7 Round: 25 Ground: Clay
| ITF M15 Cancun | 2019/04/24 14:00 | Lakat, Florian v Pedro Sakamoto | 1-6,6-3,5-7 |
| ITF M15 Cancun | 2019/04/17 16:50 | Lakat, Florian v Bradley, Julian | 1-6,6-7 |
| Oslo, Singles M-ITF-NOR-01A | 2019/03/07 09:00 | Lakat, Florian v Eriksson, Markus | 6-7,7-6,6-4 |
| Oslo, Singles M-ITF-NOR-01A | 2019/03/05 12:10 | Lakat, Florian v Kenneth Raisma | 5-7,6-4,6-3 |
| ITF - M15 Sharm El Sheikh | 2019/02/21 08:00 | Lozan, Kristian v Lakat, Florian | 6-1,6-4 |
| ITF - M15 Sharm El Sheikh | 2019/02/20 11:35 | Lakat, Florian v Francesco Passaro | 6-1,6-3 |
| ITF - M15 Sharm El Sheikh | 2019/02/18 13:45 | Maiga, Riccardo v Lakat, Florian | 2-6,4-6 |
| ITF - M15 Sharm El Sheikh | 2019/02/18 09:00 | Scotti, M. v Lakat, Florian | 6-7,2-6 |
| Tabarka, Singles Qualifying M-ITF-TUN-41A | 2019/04/29 08:00 | Recci, Mason v Onishi, Ken | 4-6,1-6 |
| Matsuyama, Singles M-ITF-JPN-06A | 2019/04/09 02:50 | Brymer, Gage v Onishi, Ken | 7-6,6-2 |
| ITF - M15 Tsukuba | 2019/03/25 01:00 | Ryuki Matsuda v Onishi, Ken | 6-2,6-3 |
| Kofu, Qualifications Simples M-ITF-JPN-03A | 2019/03/18 00:30 | Veldheer, Mick v Onishi, Ken | 7-5,6-2 |
| ITF - M15 Sharm El Sheikh | 2019/03/11 08:00 | Onishi, Ken v Tsivadze, George | 3-6,6-2,8-10 |
| ITF - M15 Sharm El Sheikh | 2019/03/06 12:35 | Onishi, Ken v Tsivadze, George | 3-6,6-2,3-6 |
| ITF Pakistan F3 | 2018/12/17 05:30 | Onishi, Ken v Lorenzo Bocchi | 6-7,3-6 |
| ITF Czech Republic F4 Qual | 2018/06/23 08:00 | Onishi, Ken v Samuel Puskar | 3-6,3-6 |