Stadium: Court 1 Round: 62 Ground: Clay
| ITF M25 Telfs | 2021/07/16 12:20 | Manda, Calin v Alexander Shevchenko | 3-6,6-7 |
| ITF M25 Telfs | 2021/07/13 07:25 | Manda, Calin v Ibrahim, Hasan | 6-4,6-2 |
| ITF M25 Telfs | 2021/07/12 07:50 | Manda, Calin v Novansky, Michal | 7-5,6-3 |
| ITF M15 Poprad | 2021/07/05 08:00 | Manda, Calin v Daniel Siniakov | 3-6,0-6 |
| UTR Pro Tennis Series Bucharest | 2021/05/30 11:30 | Borza, Bogdan v Manda, Calin | 4-6,6-2,0-0 |
| ITF - M15 Bucarest | 2021/05/23 08:30 | Manda, Calin v Macovei, Radu Florin | 6-3,6-4 |
| UTR Pro Tennis Series Bucharest | 2021/05/22 11:00 | Manda, Calin v Vlad Andrei Dancu | 2-6,2-6 |
| UTR Pro Tennis Series Bucharest | 2021/05/21 17:30 | Ilya Snitari v Manda, Calin | 3-6,6-2,6-3 |
| ITF M25 Kottingbrunn | 2021/07/18 07:30 | Habsuda, Simon v Rohrer, Niklas | 1-6,5-7 |
| ITF M25 Telfs | 2021/07/12 12:05 | Lukas Palovic v Rohrer, Niklas | 6-4,6-3 |
| ITF M25 Telfs | 2021/07/11 09:00 | Christian Fellin v Rohrer, Niklas | 2-6,3-6 |
| ITF M25 Most | 2021/05/24 08:00 | Kai Lemstra v Rohrer, Niklas | 6-3,6-2 |
| ITF M25 Most | 2021/05/23 08:00 | Rohrer, Niklas v Lukas Pokorny | 7-6,6-3 |
| ITF M25 Prague | 2021/05/09 13:30 | Lucas Bouquet v Rohrer, Niklas | 6-1,6-3 |
| ITF - M15 Antalya | 2021/04/11 07:00 | de Rossi, Marco v Rohrer, Niklas | 6-3,6-2 |
| ITF - M15 Antalya | 2021/04/04 10:00 | Matteo Gigante v Rohrer, Niklas | 6-2,6-0 |