| Latvia Int. - SP | 2021/08/27 10:00 | Mueller/Stern v Xu/Christensen | W | 2-0 |
| Denmark Masters - SP | 2021/08/06 07:00 | Ivancic/Polanc v Mueller/Stern | L | 2-1 |
| Spain Int, SP | 2021/06/18 13:00 | Mueller/Stern v Birker/Hochmeir | L | 1-2 |
| Spain Int, SP | 2021/06/18 07:45 | Mueller/Stern v De Wit/Van Wijlick | W | 2-0 |
| Spain Int, SP | 2021/06/17 11:40 | Mueller/Stern v Magee/Boyle | W | 2-1 |
| Polish Open - SP | 2021/03/28 08:00 | Choong/Toh v Mueller/Stern | L | 2-0 |
| Polish Open - SP | 2021/03/27 16:00 | Mueller/Stern v Kargaev/Vorobeva | W | 2-1 |
| Polish Open - SP | 2021/03/27 08:20 | Sjoo/Z-Bexell v Mueller/Stern | W | 0-2 |
| Latvia Int. - SP | 2021/08/27 10:30 | Kristensen/Hong v Azman/Low | W | 0-2 |