Stadium: Centre Round: 44 Ground: Clay
| ITF M25 Prague | 2021/05/11 14:50 | Martin Krumich v Chun Hsin Tseng | 1-6,4-6 |
| Challenger Ostrava | 2021/04/26 10:40 | Sebastian Baez v Martin Krumich | 6-2,6-2 |
| ITF M15 Bratislava | 2021/03/11 11:10 | Fabian Marozsan v Martin Krumich | 7-5,6-3 |
| ITF M15 Bratislava | 2021/03/10 14:40 | Stepan Pecak v Martin Krumich | 7-6,5-7,1-6 |
| ITF M15 Bratislava | 2021/03/03 09:00 | Mikalai Haliak v Martin Krumich | 6-3,2-6,6-2 |
| ITF M15 St Petersburg | 2021/02/12 10:00 | Martin Krumich v Andrey Kuznetsov | 2-6,6-7 |
| ITF M15 St Petersburg | 2021/02/11 08:30 | Artem Dubrivnyy v Martin Krumich | 4-6,6-1,5-7 |
| ITF M15 St Petersburg | 2021/02/09 10:00 | Luigi Sorrentino v Martin Krumich | 2-6,6-7 |