| Bonn International - NP | 06/17 10:20 | - | Hsin Lee/Teng v Siebrecht/Sonnenschein | L | 2-0 | |
| Bonn International - NP | 06/16 18:25 | - | Siebrecht/Sonnenschein v Babre/Arta Priedniece | W | 2-0 | |
| Swiss Open - NP | 03/23 14:20 | - | Michalski/Volkmann v Siebrecht/Sonnenschein | L | 2-0 | |
| Italian Int. WD Qual | 12/16 09:10 | - | Siebrecht/Sonnenschein v Kironda/Rusina | L | 1-2 |