| Malta Int. - Doubles Hommes | 04/06 13:40 | - | Massetti/Salutt v Dumler/Seibel | L | 2-0 | |
| Malta Int. - Doubles Hommes | 04/05 15:00 | - | Dumler/Seibel v Agai/Kis-Kasza | W | 2-1 | |
| Malta Int. - Doubles Hommes | 04/05 09:00 | - | Dumler/Seibel v Barbelette/Rosello | W | 2-0 | |
| International du Portugal Doubles Hommes | 03/08 14:20 | - | Dumler/Seibel v Chen/Lin | L | 0-2 | |
| International du Portugal Doubles Hommes - Qualif. | 03/07 20:00 | - | Dumler/Seibel v Ivancic/Koscak | W | 2-0 | |
| International du Portugal Doubles Hommes - Qualif. | 03/07 16:30 | - | Almeida/Chang v Dumler/Seibel | W | 1-2 | |
| Latvia Int. MD | 09/02 13:20 | - | Datko/Schlevoigt v Dumler/Seibel | L | 2-0 | |
| Latvia Int. MD | 09/02 07:40 | - | Dumler/Seibel v Gardon/Goulin | W | 2-1 | |
| Latvia Int. MD | 09/01 15:00 | - | Dumler/Seibel v Li B / Li J | W | 2-1 | |
| Lithuanian Int. MD | 06/11 08:20 | - | Dumler/Seibel v Al Farizi/Joaquin | L | 0-2 | |
| Lithuanian Int. MD | 06/10 17:00 | - | Thibault Gardon/Lovang v Dumler/Seibel | W | 1-2 | |
| Lithuanian Int. MD | 06/10 11:45 | - | Daoudal/Fourcade v Dumler/Seibel | W | 0-2 |