Stadium: Court 4 Round: 54 Ground: Clay
| 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 |
| UTR Pro Tennis Series Bucharest | 2021/05/21 13:10 | Jules Marie v Manda, Calin | 4-6,4-5 |
| UTR Pro Tennis Series Bucharest | 2021/05/18 08:30 | Stefan Palosi v Manda, Calin | 6-2,6-2 |
| UTR Pro Tennis Series Bucharest | 2021/05/17 12:00 | Manda, Calin v Apostol, Bogdan Ionut | 6-4,3-6,2-5 |
| ITF - M15 Antalya | 2021/03/16 07:00 | Manda, Calin v Nicolas Parizzia | 6-3,6-2 |
| ITF M15 Poprad | 2021/07/04 11:00 | Lukas Pokorny v Daniel Siniakov | 6-2,4-6,5-10 |
| ITF M25 Wroclaw | 2021/06/29 08:00 | Daniel Siniakov v Illya Beloborodko | 6-4,4-6,6-10 |
| ITF M25 Wroclaw | 2021/06/28 11:00 | Ignacio Monzon v Daniel Siniakov | 3-6,6-4,7-10 |
| ITF M25 Wroclaw | 2021/06/27 15:30 | Gajewski, Kamil v Daniel Siniakov | 2-6,5-7 |
| Challenger - Prostejov | 2021/06/15 08:30 | Daniel Siniakov v Sebastian Baez | 1-6,0-6 |
| ITF M25 Most | 2021/05/24 08:00 | Adan Freire Da Silva v Daniel Siniakov | 6-3,7-6 |
| ITF M25 Most | 2021/05/23 14:00 | Krystof Zapsky v Daniel Siniakov | 4-6,3-6 |
| ITF M25 Jablonec Nad Nisou | 2021/05/19 08:00 | Vitaliy Sachko v Daniel Siniakov | 4-6,6-3,6-4 |