Stadium: Court 2 Round: 25 Ground: Hardcourt indoor
| Challenger Liberec | 2021/08/01 12:30 | Evan Furness v Martin Krumich | 6-3,6-2 |
| ITF M25 Kottingbrunn | 2021/07/22 10:10 | Pavel Nejedly v Martin Krumich | 6-3,4-6,6-2 |
| ITF M25 Kottingbrunn | 2021/07/21 09:30 | Martin Krumich v Lukas Neumayer | 7-5,6-2 |
| ITF M25 Kottingbrunn | 2021/07/20 08:00 | Martin Krumich v Lukas Palovic | 7-5,6-2 |
| ITF M25 Kottingbrunn | 2021/07/19 11:05 | Martin Krumich v Francisco T Geschwind | 6-1,6-3 |
| ITF M15 Doboj | 2021/07/17 11:15 | Martin Krumich v Peter Fajta | 2-6,3-6 |
| ITF M15 Doboj | 2021/07/16 11:15 | Gergely Madarasz v Martin Krumich | 2-6,7-5,1-6 |
| ITF M15 Doboj | 2021/07/15 11:55 | Martin Krumich v Fabian Marozsan | 2-6,6-4,7-6 |
| ITF M25 Most | 2021/05/23 14:00 | Kai Lemstra v Vojtech Petr | 6-4,6-4 |
| Challenger Prague | 2021/05/02 14:40 | Vojtech Petr v Sergiy Stakhovsky | 3-6,7-6,5-7 |