| Open d'Allemagne - Doubles Hommes - Qualif. | 02/27 10:55 | 3 | Datko/Schlevoigt v Hammes F / Klauer C | D | Retired | |
| Dutch Open MD | 10/13 15:55 | - | Boe/Faust Kjaer v Hammes F / Klauer C | L | 2-0 | |
| Dutch Open MD | 10/12 15:00 | - | Buijk/Wassink v Hammes F / Klauer C | W | 1-2 | |
| Bonn Int. MD | 06/01 16:40 | - | Kulisek/Svejda v Hammes F / Klauer C | L | 2-0 | |
| Nantes Int. MD | 06/24 13:00 | - | Hutomo/Wijaya v Hammes F / Klauer C | L | 2-1 | |
| Luxembourg Open - Doubles Hommes | 05/06 12:00 | - | Erwiansyah/Rindorindo v Hammes F / Klauer C | L | 2-0 | |
| Dutch Int. - Doubles Hommes | 04/14 17:00 | - | Law C H / Lee C H R v Hammes F / Klauer C | L | 2-0 | |
| Welsh Int MD | 12/02 18:20 | - | Corvee/Labar v Hammes F / Klauer C | L | 2-1 | |
| Dutch Open MD | 10/15 17:55 | - | Dunn/Hall v Hammes F / Klauer C | L | 2-0 | |
| Dutch Open MD | 10/14 17:35 | - | Kholkin/Zinchenko v Hammes F / Klauer C | W | 1-2 | |
| SaarLorLux Open 2019, MD | 10/27 16:30 | 7 | Lundgaard D / Thyrri M v Hammes F / Klauer C | L | 2-0 | |
| Welsh Int. MD | 11/29 18:00 | - | Hammes F / Klauer C v Chiang C-W / Ye H W | L | 0-2 | |
| Welsh Int. MD | 11/29 14:05 | - | Ho / Ng v Hammes F / Klauer C | W | 0-2 | |
| SaarLorLux Open 2019, MD | 11/01 17:50 | 3 | Bay-Smidt M / Moelhede L v Hammes F / Klauer C | L | 2-0 | |
| SaarLorLux Open 2019, MD | 10/31 18:15 | 4 | Hammes F / Klauer C v Delrue F / Lovang K | W | 2-1 | |
| SaarLorLux Open 2019, MD | 10/30 12:40 | 5 | Hammes F / Klauer C v Nikulov V / Serpionov A | W | 2-1 | |
| Hatzor Int MD | 10/26 09:40 | - | Beketov G / Makhnovskiy M v Hammes F / Klauer C | W | 0-2 | |
| Hatzor Int MD | 10/25 14:00 | - | Hiram G / Yusim N v Hammes F / Klauer C | W | 0-2 | |
| Hatzor Int MD | 10/25 10:00 | - | Belenki O / Schwartzman S v Hammes F / Klauer C | W | 0-2 | |
| Dutch Open MD | 10/09 13:15 | 5 | Hemming C / Mairs G v Hammes F / Klauer C | L | 2-0 | |
| Dutch Open MD | 10/09 13:15 | - | Mairs/Hemming v Hammes F / Klauer C | L | 2-0 | |
| Belgian Int. MD | 09/12 15:10 | 5 | Hammes F / Klauer C v Clare M / Flynn M | L | 0-2 | |
| Hellas Int. MD | 05/04 15:30 | - | Capar M / Sonmez E v Hammes F / Klauer C | L | 2-1 | |
| Hellas Int. MD | 05/04 11:00 | - | Anjo D N / Carvalho B v Hammes F / Klauer C | W | 1-2 | |
| Giraldilla Int. XD | 03/08 14:25 | - | Hammes F / Klauer C v Jomkoh S / Sothon W | L | 0-2 | |
| Open de Suisse - Doubles Femmes - Qualif. | 09/20 16:55 | 1 | Golding R / Yap B Z H v Hammes F / Klauer C | W | 1-2 | |
| Open de Suisse - Doubles Femmes - Qualif. | 09/20 12:50 | 1 | Ostrowski A / Tomza T v Hammes F / Klauer C | W | 0-2 |