Stadium: Centre Court Round: 25 Ground: Hardcourt indoor
| Challenger Bratislava | 2021/11/08 11:50 | Milos Karol v Alexander Shevchenko | 7-6,6-4 |
| Challenger Bratislava | 2021/11/07 14:35 | Ergi Kirkin v Milos Karol | 1-6,6-7 |
| ITF M25 Prague | 2021/10/07 14:05 | Tobias Simon v Milos Karol | 6-4,4-6,7-6 |
| ITF M25 Prague | 2021/10/06 10:15 | Dominik Kellovsky v Milos Karol | 5-7,4-6 |
| ITF M25 Prague | 2021/10/04 12:20 | Milos Karol v Matyas Cerny | 7-6,7-5 |
| ITF M25 Prague | 2021/10/03 13:00 | Milos Karol v Vitek Horak | 6-0,6-1 |
| ITF M25 Budapest | 2021/09/30 09:00 | Milos Karol v Mate Valkusz | 6-7,0-6 |
| ITF M25 Budapest | 2021/09/29 07:25 | Mark Havlicek v Milos Karol | 2-6,7-6,4-6 |
| Challenger Ismaning | 2021/10/31 13:00 | Lukas Lacko v Oscar Otte | 4-6,4-6 |
| Challenger Ismaning | 2021/10/30 14:10 | Quentin Halys v Lukas Lacko | 1-6,6-7 |
| Challenger Ismaning | 2021/10/29 16:55 | Matthias Bachinger v Lukas Lacko | 5-7,6-3,4-6 |
| Challenger Ismaning | 2021/10/27 15:25 | Lukas Lacko v Tomas Machac | 6-7,6-4,7-6 |
| Challenger Ismaning | 2021/10/25 13:35 | Marius Copil v Lukas Lacko | 6-7,6-7 |
| Challenger Biel | 2021/09/21 16:00 | Lukas Lacko v Henri Laaksonen | 5-7,2-6 |
| Challenger Mallorca | 2021/09/05 17:00 | Yasutaka Uchiyama v Lukas Lacko | 7-5,6-7,1-6 |
| Challenger Mallorca | 2021/09/04 14:00 | Lukas Lacko v Tobias Kamke | 6-0,6-3 |