| Denmark Int. WD | 2019/05/11 16:07 | Watanabe/Ozaki v Piek/Seinen | L | 2-1 |
| Denmark Int. WD | 2019/05/11 15:30 | Ozaki/Watanabe v Piek/Seinen | L | 2-1 |
| Brazil International - Damendoppel - Qualifikation | 2019/05/04 14:30 | Honderich/Tsai v Piek/Seinen | L | 2-0 |
| Brazil International - Damendoppel - Qualifikation | 2019/05/03 14:00 | Lee/Lee v Piek/Seinen | W | 0-2 |
| All England Open | 2019/03/06 13:30 | Li/Zheng v Piek/Seinen | L | 2-0 |
| German Open - Frauendoppel | 2019/02/28 18:00 | Du/Li v Piek/Seinen | L | 2-0 |
| German Open - Frauendoppel | 2019/02/27 14:10 | Piek/Seinen v Karlsson/Magnusson | W | 2-1 |
| Giraldilla International - Gemischtes Doppel | 2019/02/15 19:00 | Lefel/Tran v Piek/Seinen | W | 0-2 |