Stadium: Court 5 Round: 26 Ground: Hardcourt outdoor
| ITF M15 Sozopol | 2021/09/14 09:00 | Martin Krumich v Valentin Vanta | 7-5,7-6 |
| ITF M25 Ricany | 2021/09/02 10:45 | Orlando Luz v Martin Krumich | 6-7,6-1,6-2 |
| ITF M25 Ricany | 2021/09/01 09:20 | Jiri Barnat v Martin Krumich | 2-6,3-6 |
| Challenger Prague | 2021/08/23 11:20 | Michael Geerts v Martin Krumich | 6-2,6-4 |
| ITF M25 Prostejov | 2021/08/18 08:00 | Martin Krumich v Nikolas Sanchez Izquierdo | 0-6,2-6 |
| ITF M25 Prostejov | 2021/08/17 09:15 | Martin Krumich v Daniel Siniakov | 3-6,6-4,7-5 |
| Challenger Prague | 2021/08/09 12:30 | Evan Furness v Martin Krumich | 4-6,6-4,6-3 |
| Challenger Liberec | 2021/08/01 12:30 | Evan Furness v Martin Krumich | 6-3,6-2 |
| ITF M15 Sozopol | 2021/09/14 10:00 | Konstantin Zhzhenov v Baran Cengiz | 6-7,6-4,6-1 |
| ITF M15 Kazan | 2021/03/09 11:30 | Konstantin Zhzhenov v Evgeny Philippov | 5-7,3-6 |