Stadium: Court 12 Round: 62 Ground: Hardcourt outdoor
| ITF M25 Sierre | 2021/08/31 12:15 | Rinky Hijikata v Jan Sebesta | 4-6,6-3,7-6 |
| ITF M25 Sierre | 2021/08/30 09:20 | Jan Sebesta v Pietro Schiavetti | 6-1,4-6,10-5 |
| ITF M25 Sierre | 2021/08/29 12:10 | Jan Sebesta v Filippo Carpi | 6-1,6-3 |
| ITF M25 Caslano | 2021/08/24 14:45 | Jan Sebesta v Mateus Alves | 1-6,2-6 |
| ITF M25 Muttenz | 2021/08/16 11:55 | Nicolas Kobelt v Jan Sebesta | 6-4,6-2 |
| ITF M15 Monastir | 2021/08/03 07:30 | Jan Sebesta v Mateo Nicolas Martinez | 2-6,1-6 |
| ITF M15 Monastir | 2021/08/02 07:30 | Blake Ellis v Jan Sebesta | 3-6,6-4,3-10 |
| ITF M25 Klosters | 2021/06/20 07:00 | Jan Sebesta v Lukas Palovic | 2-6,1-6 |
| ITF M15 Nules | 2021/11/17 08:30 | Xavi Calduch v Federico Campana | 2-6,2-6 |