| TT Star Series | 2021/07/13 11:15 | Matteo Mutti v Jakub Seibert | L | 3-0 |
| TT Star Series | 2021/07/13 09:45 | Dmitrij Prokopcov v Jakub Seibert | L | 3-0 |
| TT Star Series | 2021/07/13 07:45 | Thomas Keinath v Jakub Seibert | L | 3-1 |
| TT Star Series | 2021/07/12 13:15 | Tomas Beran v Jakub Seibert | W | 0-3 |
| TT Star Series | 2021/07/12 10:45 | Miroslav Sklensky v Jakub Seibert | L | 3-0 |
| TT Star Series | 2021/07/12 09:15 | Alessandro Baciocchi v Jakub Seibert | W | 2-3 |
| TT Star Series | 2021/07/02 10:15 | Thomas Keinath v Jakub Seibert | L | 3-0 |
| TT Star Series | 2021/07/02 08:45 | Jakub Zelinka v Jakub Seibert | W | 2-3 |