Stadium: Court 6 Round: 44 Ground: Clay
| ITF M15 - Bad Waltersdorf | 2021/08/30 09:00 | Martin Zeljenka v Giorgio Tabacco | 5-7,0-6 |
| ITF M15 - Bad Waltersdorf | 2021/08/30 07:00 | Lorenzo Favero v Martin Zeljenka | 1-6,6-4,2-10 |
| ITF M15 - Bad Waltersdorf | 2021/08/23 07:00 | Gabriel Decamps v Martin Zeljenka | 6-1,6-1 |
| ITF M15 - Bad Waltersdorf | 2021/08/22 07:00 | Marco De Rosa v Martin Zeljenka | 4-6,5-7 |
| ITF M15 - Warmbad-Villach | 2021/08/17 08:00 | Martin Zeljenka v Gabriel Decamps | 2-6,2-6 |
| ITF M15 - Warmbad-Villach | 2021/08/15 07:00 | Erwin Troebinger v Martin Zeljenka | 5-7,1-6 |
| ITF M25 - Pitesti | 2021/08/02 10:00 | Martin Zeljenka v Vladislav Melnic | 3-6,6-7 |
| ITF M25 - Pitesti | 2021/08/01 13:30 | Martin Zeljenka v Samuil Konov | 6-4,6-4 |
| ITF M15 - Žilina | 2021/09/01 09:55 | Kristof Minarik v Constantin Bittoun Kouzmine | 4-6,2-6 |
| ITF M15 - Žilina | 2021/08/31 07:30 | Kristof Minarik v Radovan Michalik | 6-2,6-2 |
| ITF M15 - Bratislava | 2021/08/24 08:00 | Kristof Minarik v Obrad Markovski | 7-6,3-6,3-10 |
| ITF M15 - Bratislava | 2021/08/23 09:00 | Kristof Minarik v Simon Sedliak | 6-2,6-0 |
| ITF - M15 Doboj | 2021/07/14 08:30 | Gergely Madarasz v Kristof Minarik | 7-6,7-6 |
| ITF - M15 Doboj | 2021/07/13 08:00 | Kristof Minarik v Danilo Raicevic | 6-1,6-3 |
| ITF - M15 Doboj | 2021/07/11 12:30 | Kristof Minarik v Matija Zugic | 6-4,6-2 |
| ITF M15 Poprad | 2021/07/07 11:35 | Kristof Minarik v Damien Wenger | 0-6,1-6 |