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 | Favero, Lorenzo 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 | de Rosa, Marco 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 Melnic, Vladislav | 3-6,6-7 |
| ITF M25 Pitesti | 2021/08/01 13:30 | Martin Zeljenka v Samuil Konov | 6-4,6-4 |
| ITF M15 Zilina | 2021/09/01 09:55 | Minarik, Kristof v Constantin Bittoun Kouzmine | 4-6,2-6 |
| ITF M15 Zilina | 2021/08/31 07:30 | Minarik, Kristof v Radovan Michalik | 6-2,6-2 |
| ITF M15 Bratislava | 2021/08/24 08:00 | Minarik, Kristof v Obrad Markovski | 7-6,3-6,3-10 |
| ITF M15 Bratislava | 2021/08/23 09:00 | Minarik, Kristof v Simon Sedliak | 6-2,6-0 |
| ITF - M15 Doboj | 2021/07/14 08:30 | Gergely Madarasz v Minarik, Kristof | 7-6,7-6 |
| ITF - M15 Doboj | 2021/07/13 08:00 | Minarik, Kristof v Danilo Raicevic | 6-1,6-3 |
| ITF - M15 Doboj | 2021/07/11 12:30 | Minarik, Kristof v Zugic, Matija | 6-4,6-2 |
| ITF M15 Poprad | 2021/07/07 11:35 | Minarik, Kristof v Damien Wenger | 0-6,1-6 |