Stadium: Court 3 Round: 54 Ground: Clay
| 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 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 |