| ITTF Pan American Championships | 09/10 18:30 | - | Lehmann, Matthew v Adrian Perez | L | 0-4 | |
| WTT Feeder Westchester | 05/12 21:30 | - | Lehmann, Matthew v Rares Sipos | - | View | |
| Polish Open | 03/12 14:00 | - | Lehmann, Matthew v Tomicki, Jaroslaw | L | 0-3 | |
| Polish Open | 03/11 14:20 | - | Lehmann, Matthew v Rafael Turrini | L | 1-3 | |
| Czech Republic First League | 03/08 10:58 | - | Matej Stach v Lehmann, Matthew | L | 3-2 | |
| Czech Republic First League | 03/08 10:15 | - | Vojtech Klimek v Lehmann, Matthew | L | 3-2 | |
| Czech Republic First League | 02/23 11:23 | - | Lehmann, Matthew v Tomas Koldas | L | 2-3 | |
| Czech Republic First League | 01/25 10:47 | - | Lukas Boruvka v Lehmann, Matthew | W | 0-3 | |
| North American Open | 12/05 21:55 | - | Zeng, Beixun v Lehmann, Matthew | L | 4-0 | |
| Czech Republic First League | 11/24 09:40 | - | Lehmann, Matthew v Marek Obeslo | L | 2-3 | |
| Summer Universiade | 07/09 10:45 | - | Lehmann, Matthew v Peng, Wang-Wei | L | 0-4 | |
| Slovenia Open | 05/08 13:40 | - | Amalraj Anthony v Lehmann, Matthew | L | 3-0 | |
| Slovenia Open | 05/08 09:00 | - | Putuntica, Andrei v Lehmann, Matthew | L | 3-1 | |
| Serbia Open | 05/02 08:10 | - | Ismailov, Sadi v Lehmann, Matthew | L | 3-0 | |
| Serbia Open | 05/01 08:50 | - | Lehmann, Matthew v Cedric Meissner | L | 0-3 | |
| Qatar Open XD | 08/21 09:40 | 1 | Lehmann, Matthew v Zatowka, Patryk | L | 0-4 | |
| République tchèque - Extraleague | 08/21 07:00 | 1 | Lehmann, Matthew v Takami, Masaki | L | 1-3 | |
| Qatar Open XD | 04/02 08:55 | 1 | Lehmann, Matthew v Cedric Tschanz | L | 0-4 | |
| Qatar Open XD | 01/16 17:10 | 1 | Nima Alamian v Lehmann, Matthew | L | 4-2 | |
| Qatar Open XD | 11/14 13:30 | 1 | Ghosh, Soumyajit v Lehmann, Matthew | L | 4-0 | |
| Qatar Open XD | 10/04 09:00 | 1 | Kacper Petas v Lehmann, Matthew | L | 3-1 | |
| Qatar Open XD | 04/27 07:40 | 1 | Lehmann, Matthew v Peter Hribar | L | 1-3 | |
| Qatar Open XD | 11/09 16:56 | - | Michal Obeslo v Lehmann, Matthew | L | 4-0 | |
| Qatar Open XD | 11/09 10:02 | - | Michael Trink v Lehmann, Matthew | L | 3-0 |