Stadium: Court 8 Round: 44 Ground: Clay
| ITF - M15 Warmbad-Villach | 2021/08/17 07:30 | Marco De Rosa v Giacomo Revelli | 7-6,4-6,1-10 |
| ITF - M15 Warmbad-Villach | 2021/08/16 07:00 | Tino Kovacic v Marco De Rosa | 3-6,4-6 |
| ITF - M15 Cairo | 2021/08/01 12:30 | Michael Bassem Sobhy v Marco De Rosa | 6-0,5-7,10-4 |
| ITF - M15 Cairo | 2021/07/26 09:00 | Keisuke Saitoh v Marco De Rosa | 7-6,6-0 |
| ITF - M15 Cairo | 2021/07/25 09:30 | Giulio Colacioppo v Marco De Rosa | 2-6,4-6 |
| ITF - M15 Cairo | 2021/07/18 09:30 | Fares Zakaria v Marco De Rosa | 6-2,6-7,14-12 |
| ITF - M25 Velenje | 2021/07/05 13:50 | Marco De Rosa v Tim Heger | 4-6,2-6 |
| ITF - M15 Cairo | 2021/05/03 08:00 | Marco De Rosa v Martin Dimitrov | 7-6,2-6,9-11 |
| 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 Novi Sad | 2021/07/25 07:00 | Martin Zeljenka v Danilo Raicevic | 4-6,4-6 |
| ITF - M25 Kottingbrunn | 2021/07/19 12:25 | Peter Goldsteiner v Martin Zeljenka | 6-4,7-6 |
| ITF - M25 Kottingbrunn | 2021/07/18 07:30 | Martin Zeljenka v Rafael Kis Balazs | 2-6,6-4,10-2 |
| ITF - M25 Belgrad | 2021/06/29 07:00 | Bogdan Pavel v Martin Zeljenka | 6-1,6-3 |