| TT Star Series | 2021/04/29 13:15 | Miroslav Horejsi v Jakub Seibert | L | 3-0 |
| TT Star Series | 2021/04/29 10:45 | Ondrej Bajger v Jakub Seibert | L | 3-0 |
| TT Star Series | 2021/04/29 09:15 | Petr David v Jakub Seibert | L | 3-0 |
| TT Star Series | 2021/04/29 06:00 | Antonin Gavlas v Jakub Seibert | L | 3-0 |
| TT Star Series | 2021/04/20 11:15 | Radim Moravek v Jakub Seibert | W | 1-3 |
| TT Star Series | 2021/04/20 09:45 | David Reitspies v Jakub Seibert | L | 3-0 |
| TT Star Series | 2021/04/19 13:15 | Michal Benes v Jakub Seibert | L | 3-0 |
| TT Star Series | 2021/04/19 10:45 | Jiri Vrablik v Jakub Seibert | L | 3-0 |