| Challenger - Ochsenhausen | 2020/02/17 16:20 | Jakub Kosowski v Jiri Vrablik | L | 2-3 |
| Challenger - Ochsenhausen | 2020/02/17 13:30 | Jakub Kosowski v Florian Bluhm | W | 3-1 |
| Challenger - Ochsenhausen | 2020/02/17 10:10 | Liang Qiu v Jakub Kosowski | W | 0-3 |
| Challenger - Ochsenhausen | 2020/02/17 08:10 | Jakub Kosowski v Michal Bankosz | W | 3-1 |
| Challenger - Ochsenhausen | 2019/12/17 12:40 | Jakub Kosowski v Yannick Vostes | L | 0-3 |
| Challenger - Ochsenhausen | 2019/12/17 09:40 | Tomas Konecny v Jakub Kosowski | W | 2-3 |
| Challenger - Ochsenhausen | 2019/12/17 08:10 | Jakub Kosowski v Evgueni Chtchetinine | W | 3-0 |
| Challenger - Ochsenhausen | 2019/12/16 11:30 | Fedor Kuzmin v Jakub Kosowski | W | 2-3 |
| Spanish Open | 2020/02/06 14:55 | Lev Katsman v Andreas Levenko | L | 3-4 |
| Spanish Open | 2020/02/05 16:55 | Chih-Wei Yeh v Lev Katsman | W | 3-4 |
| Oman Open - U21 - Kvinder | 2020/02/05 15:40 | Maksim Grebnev v Lev Katsman | L | 3-1 |
| Oman Open - U21 - Kvinder | 2019/10/31 15:50 | Lev Katsman v Rares Sipos | L | 1-3 |
| Belarus Open | 2019/10/31 11:40 | Hiroto Shinozuka v Lev Katsman | L | 4-2 |
| German Open | 2019/10/08 09:30 | Lev Katsman v Joao Monteiro | L | 3-4 |
| Russia Cup | 2019/09/20 07:37 | Lev Katsman v Aleksei Zhukov | W | 3-0 |
| Russia Cup | 2019/09/19 12:26 | Lev Katsman v Ilya Berezin | W | 3-0 |