Stadium: MTA 16 Round: 62 Ground: Clay
| ITF M15 Antalya | 2021/04/21 08:45 | Paul Woerner v Daniel Siniakov | 6-4,6-3 |
| ITF M15 Antalya | 2021/04/20 07:00 | Michel Vernier v Daniel Siniakov | 0-6,7-6,4-10 |
| ITF M15 Antalya | 2021/04/19 07:00 | Daniel Siniakov v Cheong-Eui Kim | 6-4,3-6,11-9 |
| ITF M15 Antalya | 2021/04/18 07:00 | Daniel Siniakov v Leon Benedict | 6-2,6-1 |
| 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 Antalya | 2021/04/20 12:00 | Dan Alexandru Tomescu v Oleksandr Ovcharenko | 6-3,4-6,6-10 |
| ITF M15 Antalya | 2021/04/19 09:00 | Dan Alexandru Tomescu v Francesco Maestrelli | 7-6,6-7,10-7 |
| ITF M15 Antalya | 2021/03/16 09:30 | Dan Alexandru Tomescu v Luca Tomasetto | 7-6,3-6,8-10 |
| ITF M15 Antalya | 2021/03/15 08:00 | Dan Alexandru Tomescu v Arsenije Zlatanovic | 7-6,6-2 |
| ITF M15 Antalya | 2021/03/14 07:00 | Dan Alexandru Tomescu v Rafael Giotis | 6-0,6-2 |
| ITF M15 Antalya | 2021/03/07 07:00 | Dan Alexandru Tomescu v Bautista Vilicich | 7-6,5-7,6-10 |
| ITF M15 Antalya | 2021/02/08 07:00 | Dan Alexandru Tomescu v Davide Galoppini | 6-1,1-6,4-10 |
| ITF M15 Antalya | 2021/02/07 06:00 | Dan Alexandru Tomescu v Koray Kirci | 6-3,6-1 |