| Challenger Series TT | 04/12 08:15 | - | Dennis Klein v Daniel Rinderer | - | CANC | |
| Challenger Series TT | 02/27 14:30 | 1 | Liang Qiu v Dennis Klein | W | 1-3 | |
| Challenger Series TT | 02/27 13:05 | 2 | Dennis Klein v Mohammed Javad Sohrabi | W | 3-0 | |
| Challenger Series TT | 02/27 08:50 | - | Alexander Valuch v Dennis Klein | W | 1-3 | |
| Challenger Series TT | 02/26 20:50 | - | Samuel Amann v Dennis Klein | W | 0-3 | |
| Challenger Series TT | 02/26 18:50 | - | Akito Itagaki v Dennis Klein | L | 3-1 | |
| Challenger Series TT | 02/26 16:50 | - | Dennis Klein v Mohammed Javad Sohrabi | W | 3-0 | |
| Challenger Series TT | 02/26 14:10 | - | Dennis Klein v Sven Happek | W | 3-0 | |
| Challenger Series TT | 02/26 12:10 | - | Dennis Klein v Haruki Harada | L | 2-3 | |
| Challenger Series TT | 02/26 09:30 | - | Liang Qiu v Dennis Klein | W | 2-3 | |
| Challenger Series TT | 01/30 14:30 | 1 | Alberto Lillo v Dennis Klein | W | 0-3 | |
| Challenger Series TT | 01/30 13:05 | 2 | Dennis Klein v Marius Henninger | W | 3-0 |