| Championnat d'Europe - U21 - Doubles Hommes | 2021/11/12 17:00 | Grebnev / Katsman v Haug/Christensen | W | 3-1 |
| Championnat d'Europe - U21 - Doubles Hommes | 2021/11/12 15:40 | Grebnev / Katsman v Karabaxhak/Magalhaes | W | 3-0 |
| WTT Contender Tunis MD | 2021/10/27 09:30 | Martinko J / Polansky T v Grebnev / Katsman | L | 3-1 |
| European Championships MD | 2021/06/27 14:10 | Grebnev / Katsman v Dyjas/Nuytinck | W | 3-1 |
| European Championships MD | 2021/06/26 14:35 | Grebnev / Katsman v Ecseki N / Szudi A | W | 3-2 |
| European Championships MD | 2021/06/26 08:35 | Duda B / Qiu D v Grebnev / Katsman | W | 1-3 |
| European Championships MD | 2021/06/25 08:40 | Grebnev / Katsman v Falck/Kristian Karlsson | W | 3-2 |
| European Championships MD | 2021/06/24 09:40 | Jevtovic M / Peto Z v Grebnev / Katsman | W | 1-3 |
| Championnat d'Europe - U21 - Doubles Hommes | 2021/11/12 17:00 | Andras/Ban v Meng/Oehme | W | 3-1 |
| Championnat d'Europe - U21 - Doubles Hommes | 2021/11/12 15:40 | Andras/Ban v Promberger/Tsyhanouski | W | 3-0 |