Stadium: Court 3 Round: 25 Ground: Hardcourt outdoor
| ITF M15 Zlatibor | 2021/09/12 07:30 | Martin Zeljenka v Minarik, Kristof | 2-6,2-6 |
| 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 |
| Pirot, Singles M-ITF-SRB-05A | 2021/09/25 08:00 | Aldin Setkic v Federico Iannaccone | 6-3,3-6,7-6 |
| Pirot, Singles M-ITF-SRB-05A | 2021/09/24 08:00 | Dominik Palan v Federico Iannaccone | 2-6,1-6 |
| Pirot, Singles M-ITF-SRB-05A | 2021/09/23 08:00 | Nicolas Parizzia v Federico Iannaccone | 4-6,2-6 |
| Challenger Como | 2021/09/01 09:50 | Federico Iannaccone v Riccardo Bonadio | 2-6,1-6 |
| Challenger Como | 2021/08/31 11:05 | Federico Iannaccone v Camilo Ugo Carabelli | 5-7,6-3,6-4 |
| ITF M25 Caslano | 2021/08/24 13:30 | Federico Iannaccone v Martinez, Mirko | 6-2,4-6,4-6 |
| ITF M15 Bergamo | 2021/06/22 13:35 | Alexander Weis v Federico Iannaccone | 6-2,6-4 |
| ITF M15 Bergamo | 2021/06/21 22:35 | Federico Iannaccone v Quentin Folliot | 7-5,6-2 |