| Open de France - Doubles Mixtes | 2018/10/25 12:10 | Seidel / Efler v Hoki T / Nagahara W | L | 1-2 |
| Open d'Angleterre | 2018/10/18 12:48 | Christiansen M / Pedersen C v Seidel / Efler | L | 2-0 |
| Denmark Open XD | 2018/10/18 09:20 | Christiansen M / Pedersen C v Seidel / Efler | L | 2-0 |
| Denmark Open XD | 2018/10/17 10:40 | Seidel / Efler v Magee S / Magee C | W | 2-0 |
| Indonesia Masters XD | 2018/09/25 07:40 | Seidel / Efler v Kim W H / Baek H N | L | 1-2 |
| Open d'Angleterre | 2018/09/18 10:45 | Chopra P J / Reddy N S v Seidel / Efler | L | 2-0 |
| Open d'Angleterre | 2018/09/11 08:30 | Seidel / Efler v Lee / Wang | L | 0-2 |
| Open d'Angleterre | 2018/07/31 09:30 | Seidel / Efler v Watanabe/Higashino | L | 0-2 |
| Giraldilla Int. XD | 2018/07/26 05:20 | Dremin E / Dimova E v Nikulov V / Semenova A | L | 2-1 |