Stadium: Court 1 Round: 54 Ground: Clay
| ITF M25 Klosters | 2021/06/20 07:00 | Jan Sebesta v Lukas Palovic | 2-6,1-6 |
| ITF M25 Biel | 2021/03/29 14:30 | Mick Veldheer v Jan Sebesta | 6-3,6-1 |
| ITF M25 Trimbach | 2021/03/10 12:30 | Jan Sebesta v Antoine Bellier | 2-6,1-6 |
| ITF M25 Trimbach | 2021/03/09 08:55 | Giovanni Agostinetto v Jan Sebesta | 4-6,2-6 |
| ITF M25 Trimbach | 2021/03/08 15:35 | Alexander Wolfschmidt v Jan Sebesta | 2-6,4-6 |
| ITF M15 Antalya | 2021/02/21 13:00 | Dragos Nicolae Madaras v Jan Sebesta | 6-1,6-3 |
| ITF M15 Antalya | 2021/01/07 09:00 | Davide Galoppini v Jan Sebesta | 6-4,6-4 |
| ITF M15 Antalya | 2021/01/06 07:30 | Daniil Savelev v Jan Sebesta | 5-7,2-6 |
| ITF M15 Gaiba | 2021/06/07 14:50 | Mattia Frinzi v Filippo Carpi | 6-2,6-2 |