| Czech Open XD | 2021/10/22 15:00 | Birker P / Hochmeir K v Zinchenko/Kozyreva | L | 0-2 |
| Dutch Open XD | 2021/10/16 09:00 | Tabeling / Piek v Birker P / Hochmeir K | L | 2-0 |
| Dutch Open XD | 2021/10/14 08:30 | Birker P / Hochmeir K v Gnedt R / Polc U | W | 2-0 |
| Polish Int. XD | 2021/09/25 08:00 | Wassink/Tirtosentono v Birker P / Hochmeir K | L | 2-0 |
| Ukraine Int. XD | 2021/09/09 07:20 | Yap/Siow v Birker P / Hochmeir K | L | 2-0 |
| Ukraine Int. XD | 2021/09/08 08:00 | Yakovlev/Tkach v Birker P / Hochmeir K | W | 1-2 |
| Spain Int XD | 2021/06/19 07:00 | Hemming C / Pugh J v Birker P / Hochmeir K | L | 2-0 |
| Spain Int XD | 2021/06/18 13:00 | Mueller/Stern v Birker P / Hochmeir K | W | 1-2 |