Stadium: Pernerka Court Round: 19 Ground: Clay
| Challenger Liberec | 2021/08/01 16:30 | Geoffrey Blancaneaux v Daniel Siniakov | 2-6,3-6 |
| ITF M15 Poprad | 2021/07/06 07:55 | Illya Beloborodko v Daniel Siniakov | 3-6,7-6,7-5 |
| ITF M15 Poprad | 2021/07/05 08:00 | Manda, Calin v Daniel Siniakov | 3-6,0-6 |
| 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 |
| Challenger Liberec | 2021/08/01 12:30 | Vega Hernandez, David v Bellucci, Thomaz | 6-3,3-6,6-3 |
| ITF - M15 Telde | 2019/11/27 10:00 | Vega Hernandez, David v Ojeda Lara, Ricardo | 3-6,1-6 |
| ITF - M15 Telde | 2019/11/26 11:30 | Vega Hernandez, David v Pawel Juszczak | 6-4,6-1 |
| Challenger Seville | 2019/09/10 08:00 | Vega Hernandez, David v Laurent Lokoli | 3-6,5-7 |
| Challenger Seville | 2019/09/09 09:00 | Gonzalez, Alejandro v Vega Hernandez, David | 4-6,7-6,4-6 |
| L'Aquila, Italie | 2019/08/19 08:00 | Rodriguez, Cristian v Vega Hernandez, David | 6-7,6-4,7-5 |
| Challenger - Tunis | 2019/04/16 09:00 | Vega Hernandez, David v Brkic, Tomislav | 3-6,1-6 |
| Challenger - Tunis | 2019/04/15 09:00 | Vega Hernandez, David v Gille, Sander | 6-7,6-3,6-4 |