| WTT Feeder Dusseldorf II Quals | 11/18 14:00 | 6 | Matthew Lehmann v Kas Van Oost | L | 0-3 | |
| Challenger Series TT | 08/20 08:30 | - | Matthew Lehmann v Dauud Cheaib | L | 1-3 | |
| Challenger Series TT | 08/20 06:30 | - | Matthew Lehmann v Miguel Nunez Tapia | L | 1-3 | |
| Challenger Series TT | 08/19 16:00 | - | Matthew Lehmann v Norbert Tauler | L | 0-3 | |
| Challenger Series TT | 08/19 12:30 | - | Matthew Lehmann v Florian Bluhm | L | 0-3 | |
| Challenger Series TT | 08/19 11:00 | - | Matthew Lehmann v Olav Kosolosky | L | 0-3 | |
| Challenger Series TT | 08/19 08:30 | - | Diego Piguave v Matthew Lehmann | L | 3-1 | |
| Challenger Series TT | 08/19 07:00 | - | Matthew Lehmann v Jeromy Loffler | L | 0-3 | |
| Challenger Series TT | 08/13 07:30 | - | Kestutis Zeimys v Matthew Lehmann | L | 3-0 | |
| Challenger Series TT | 08/12 17:30 | - | Matthew Lehmann v Lukas Bosbach | L | 1-3 | |
| Challenger Series TT | 08/12 16:00 | - | Matias Danzer v Matthew Lehmann | L | 3-2 | |
| Challenger Series TT | 08/12 14:00 | - | Marcel Neumaier v Matthew Lehmann | L | 3-0 |