Stadium: Court 9 Round: 28 Ground: Clay
| Challenger Salinas 2 | 2021/04/27 14:30 | Gonzalo Villanueva v David Poljak | 5-7,7-6,7-6 |
| Challenger Salinas 2 | 2021/04/26 18:35 | Miguel M Larrea v David Poljak | 3-6,0-6 |
| Challenger Salinas | 2021/04/18 15:00 | Tak Khunn Wang v David Poljak | 6-3,6-3 |
| ITF M15 Sharm El Sheikh | 2021/04/10 07:30 | Mukund Sasikumar v David Poljak | 6-3,6-2 |
| ITF M15 Sharm El Sheikh | 2021/04/09 07:30 | David Poljak v Luke Johnson | 6-3,1-6,6-3 |
| ITF M15 Sharm El Sheikh | 2021/04/08 07:30 | David Poljak v Mattia Bellucci | 6-2,6-1 |
| ITF M15 Sharm El Sheikh | 2021/04/07 08:30 | David Poljak v Lukas Pokorny | 6-3,6-3 |
| ITF M15 Sharm El Sheikh | 2021/04/02 07:30 | Ryan Nijboer v David Poljak | 6-2,2-6,6-4 |
| ITF M15 Rovinj | 2021/03/16 10:00 | Giovanni Fonio v Zsombor Piros | 6-3,6-3 |
| ITF M15 Bratislava | 2021/03/06 09:00 | Zsombor Piros v Vitaliy Sachko | 6-3,3-6,4-6 |
| ITF M15 Bratislava | 2021/03/05 10:40 | Kyrian Jacquet v Zsombor Piros | 4-6,3-6 |
| ITF M15 Bratislava | 2021/03/04 09:25 | Lukas Palovic v Zsombor Piros | 3-6,2-6 |
| ITF M15 Bratislava | 2021/03/03 14:45 | Dominik Recek v Zsombor Piros | 4-6,3-6 |
| ITF M15 Sharm El Sheikh | 2021/02/12 07:30 | Zsombor Piros v Nicolas Moreno De Alboran | 0-6,6-4,1-6 |
| ITF M15 Sharm El Sheikh | 2021/02/11 07:30 | Zsombor Piros v Yu Hsiou Hsu | 0-6,6-3,6-2 |
| ITF M15 Sharm El Sheikh | 2021/02/10 07:30 | Shintaro Imai v Zsombor Piros | 3-6,6-1,6-7 |