| TT Star Series | 2021/05/24 11:45 | David Reitspies v Jakub Seibert | L | 3-0 |
| TT Star Series | 2021/05/24 07:10 | Tomas Konecny v Jakub Seibert | L | 3-1 |
| TT Star Series | 2021/05/11 09:45 | David Prusa v Jakub Seibert | W | 0-3 |
| TT Star Series | 2021/05/11 08:45 | Michal Benes v Jakub Seibert | L | 3-2 |
| TT Star Series | 2021/05/11 07:10 | Jakub Seibert v Frantisek Onderka | L | 1-3 |
| TT Star Series | 2021/05/10 13:05 | Jakub Seibert v Miroslav Horejsi | L | 0-3 |
| TT Star Series | 2021/05/10 11:35 | Tomas Martinko v Jakub Seibert | L | 3-1 |
| TT Star Series | 2021/05/10 09:45 | Ondrej Bajger v Jakub Seibert | W | 1-3 |
| TT Star Series | 2021/05/24 10:45 | Michal Benes v Jakub Slapnicka | L | 3-1 |
| TT Star Series | 2021/05/24 09:15 | David Reitspies v Jakub Slapnicka | L | 3-0 |
| TT Star Series | 2021/05/24 06:00 | Dmitrij Prokopcov v Jakub Slapnicka | L | 3-0 |
| TT Star Series | 2021/05/18 11:15 | Jakub Slapnicka v Filip Cernota | L | 0-3 |
| TT Star Series | 2021/05/18 09:15 | Miroslav Horejsi v Jakub Slapnicka | L | 3-0 |
| TT Star Series | 2021/05/17 12:45 | Patrik Klos v Jakub Slapnicka | L | 3-0 |
| TT Star Series | 2021/05/17 11:15 | Jakub Slapnicka v Jiri Vrablik | L | 0-3 |
| TT Star Series | 2021/05/17 09:45 | Jakub Slapnicka v Tomas Konecny | L | 2-3 |