Stadium: Court 18 Round: 62 Ground: Clay
| ITF M25 - Grodzisk Mazowiecki | 2021/08/02 13:00 | Yujiro Onuma v Vojtech Vlkovsky | 1-6,0-6 |
| ITF M25 - Grodzisk Mazowiecki | 2021/08/02 08:00 | Yujiro Onuma v Piotr Pawlak | 3-6,6-3,10-6 |
| ITF M25 - Grodzisk Mazowiecki | 2021/08/01 09:55 | Dominik Langmajer v Yujiro Onuma | 3-6,3-6 |
| LTA British Tour | 2020/09/04 10:00 | Yujiro Onuma v Jonathan Gray | 3-6,3-6 |
| ITF M25 - Sunderland | 2020/02/23 12:25 | Yujiro Onuma v Hendrik Jebens | 6-7,2-6 |
| ITF M25 - Glasgow | 2020/02/16 16:15 | Yujiro Onuma v Tom Hands | 2-6,2-6 |
| ITF M25 - Shrewsbury | 2019/09/23 15:35 | Elliott Farmer v Yujiro Onuma | 6-3,6-4 |
| ITF M25 - Shrewsbury | 2019/09/23 11:15 | Yujiro Onuma v Cheraag Bajwa | 1-6,6-1,10-6 |
| ITF M25 - Grodzisk Mazowiecki | 2021/08/02 12:20 | Jan Jermar v Roman Postolka | 2-6,0-6 |
| ITF M25 - Grodzisk Mazowiecki | 2021/08/01 16:05 | Sebastian Usiadek v Jan Jermar | 3-6,3-6 |
| ITF M25 - Kottingbrunn | 2021/07/19 13:45 | Jan Jermar v Francisco Vittar | 4-6,5-7 |
| ITF M25 - Kottingbrunn | 2021/07/18 07:30 | Laurin Aerne v Jan Jermar | 1-6,2-6 |
| ITF M25 - Telfs | 2021/07/12 07:50 | Neil Oberleitner v Jan Jermar | 6-3,6-0 |
| ITF M15 - Poprad | 2021/07/07 10:10 | Luca Castelnuovo v Jan Jermar | 7-6,6-2 |
| ITF M25 - Most | 2021/05/24 08:00 | Jakub Beran v Jan Jermar | 6-4,6-7,10-3 |
| ITF M25 - Jablonec Nad Nisou | 2021/05/17 07:30 | Jan Jermar v Kai Lemstra | 4-6,4-6 |