| ITF Slovakia F1 | 2017/07/25 11:00 | Ken Onishi v Alessandro Ricci | 6-2,7-5 |
| ITF Austria F2 | 2017/07/10 11:00 | Ken Onishi v Jeremy Jahn | 3-6,6-7 |
| ITF Czech Republic F4 | 2017/07/05 10:30 | Jonathan Mridha v Ken Onishi | 6-2,6-1 |
| ITF Czech Republic F4 | 2017/07/04 09:35 | Ken Onishi v Michal Konecny | 3-6,6-4,7-5 |
| ITF Romania F4 | 2017/06/21 09:45 | Ken Onishi v Adrian Ungur | 2-6,0-6 |
| ITF Romania F3 | 2017/06/15 07:00 | Nicolae Frunza v Ken Onishi | 6-4,6-1 |
| ITF Romania F3 | 2017/06/14 07:00 | Riccardo Maiga v Ken Onishi | 7-6,1-6,2-6 |
| ITF Hungary F3 | 2017/05/24 09:30 | Ken Onishi v Gabor Borsos | 1-6,1-6 |
| ITF Slovakia F1 | 2017/07/25 12:15 | Tomas Liska v Dominik Sproch | 3-6,7-6,6-0 |
| ITF Czech Republic F6 Qual | 2017/07/16 11:00 | Ivan Sabanov v Tomas Liska | 6-1,6-4 |
| ITF Czech Republic F6 Qual | 2017/07/16 07:00 | Peter Samosi v Tomas Liska | 2-6,0-6 |
| ITF Czech Republic F6 Qual | 2017/07/15 07:00 | Stepan Holis v Tomas Liska | 4-6,7-6,3-6 |
| ITF Czech Republic F5 | 2017/07/10 08:00 | Jan Mertl v Tomas Liska | 6-4,6-2 |
| ITF Czech Republic F5 Qual | 2017/07/09 11:25 | Roman Boychuk v Tomas Liska | 3-6,3-6 |
| ITF Czech Republic F5 Qual | 2017/07/08 08:00 | Marko Pasalic v Tomas Liska | 1-6,0-6 |
| Challenger Poprad Tatry Qual | 2017/06/17 10:15 | Filip Horansky v Tomas Liska | 6-3,6-3 |