Stadium: Court 11 Round: 14 Ground: Clay
| Challenger Prague | 2021/08/25 12:25 | Michael Geerts v Alex Rybakov | 6-2,6-2 |
| Challenger Prague | 2021/08/24 10:15 | Johannes Haerteis v Alex Rybakov | 4-6,2-6 |
| Challenger Prague | 2021/08/23 08:00 | Nick Hardt v Alex Rybakov | 6-7,3-6 |
| Challenger Prague | 2021/08/22 08:00 | Marek Gengel v Alex Rybakov | 5-7,1-6 |
| ITF M25 Prostejov | 2021/08/20 08:00 | Nikolas Sanchez Izquierdo v Alex Rybakov | 6-3,6-2 |
| ITF M25 Prostejov | 2021/08/19 08:15 | Alex Rybakov v Nick Chappell | 6-2,7-6 |
| ITF M25 Prostejov | 2021/08/18 07:55 | Alex Rybakov v Marek Gengel | 6-3,6-3 |
| ITF M25 Prostejov | 2021/08/17 09:00 | Alex Rybakov v David Poljak | 7-6,7-6 |
| ITF M15 Sofia | 2021/07/09 07:00 | Nikita Mashtakov v Dragos Nicolae Madaras | 5-7,2-6 |
| ITF M15 Sofia | 2021/07/08 09:00 | Nikita Mashtakov v Aleksandr Braynin | 6-4,6-2 |
| ITF M15 Sofia | 2021/07/07 13:10 | Nikita Mashtakov v Mihai Razvan Marinescu | 3-6,6-1,6-1 |
| ITF M15 Novomoskovsk | 2021/06/03 18:30 | Nikita Mashtakov v Martins Podzus | 4-6,1-6 |
| ITF M15 Novomoskovsk | 2021/05/28 07:15 | Felix Gill v Nikita Mashtakov | 7-5,6-7,6-4 |
| ITF M15 Novomoskovsk | 2021/05/27 07:15 | Oleksandr Bielinskyi v Nikita Mashtakov | 6-3,1-6,5-7 |
| ITF M15 Novomoskovsk | 2021/05/26 06:15 | Nikita Mashtakov v Martins Podzus | 5-7,6-3,6-4 |
| ITF M15 Sibenik | 2021/05/20 11:00 | Nikita Mashtakov v Tom Kocevar-Desman | 5-7,4-6 |