| Dutch Open XD | 2021/10/13 18:55 | Mueller/Stern v Bugtrup/Bergstein | L | 0-2 |
| Hellas Int. XD | 2021/09/03 13:25 | Siow/Yap v Mueller/Stern | L | 2-0 |
| Hellas Int. XD | 2021/09/03 06:00 | Mueller/Stern v Tores/Vercelot | W | 2-0 |
| Latvia Int. XD | 2021/08/28 07:00 | Mueller/Stern v Azman/Low | L | 0-2 |
| Latvia Int. XD | 2021/08/27 10:00 | Mueller/Stern v Xu/Christensen | W | 2-0 |
| Denmark Masters XD | 2021/08/06 07:00 | Ivancic/Polanc v Mueller/Stern | L | 2-1 |
| Spain Int XD | 2021/06/18 13:00 | Mueller/Stern v Birker/Hochmeir | L | 1-2 |
| Spain Int XD | 2021/06/18 07:45 | Mueller/Stern v De Wit/Van Wijlick | W | 2-0 |