Stadium: MTA 12 Round: 62 Ground: Clay
| ITF M15 Antalya | 2021/04/11 07:00 | Daniel Siniakov v Taiyo Yamanaka | 1-6,2-6 |
| ITF M15 Bratislava | 2021/03/04 10:55 | Riccardo Balzerani v Daniel Siniakov | 1-6,6-3,6-3 |
| ITF M15 Bratislava | 2021/03/03 16:55 | Piotr Grynkowski v Daniel Siniakov | 3-6,6-3,1-6 |
| ITF M15 Bratislava | 2021/03/02 09:00 | Peter Makk v Daniel Siniakov | 6-2,6-7,5-10 |
| ITF M15 Bratislava | 2021/03/01 09:00 | Daniel Siniakov v Philip Bachmaier | 6-2,7-6 |
| ITF M25 Pardubice | 2020/09/27 09:00 | Matic Spec v Daniel Siniakov | 1-6,6-2,13-11 |
| ITF M25 Prague | 2020/09/13 09:00 | Wojciech Marek v Daniel Siniakov | 6-0,6-4 |
| ITF M15 Milovice | 2019/11/12 12:25 | Daniel Siniakov v Jakob Aichhorn | 6-7,0-6 |
| ITF M15 Antalya | 2021/04/04 06:30 | Sandro Kopp v Leon Benedict | 6-2,6-4 |