Stadium: Court 1 Round: 62 Ground: Clay
| ITF M25 Prague | 2021/10/05 08:00 | Filip Duda v Daniel Siniakov | 6-1,6-4 |
| ITF M25 Pardubice | 2021/09/23 12:30 | Daniel Siniakov v Eric Vanshelboim | 6-4,1-6,2-6 |
| ITF M25 Pardubice | 2021/09/22 11:05 | Daniel Siniakov v Stefanos Sakellaridis | 6-3,6-2 |
| ITF M25 Ricany | 2021/09/01 09:05 | Marek Gengel v Daniel Siniakov | 7-5,6-3 |
| Challenger Prague | 2021/08/24 13:45 | Daniel Siniakov v Igor Sijsling | 4-6,3-6 |
| ITF M25 Prostejov | 2021/08/17 09:15 | Martin Krumich v Daniel Siniakov | 3-6,6-4,7-5 |
| Challenger Liberec | 2021/08/03 15:10 | Nikola Milojevic v Daniel Siniakov | 7-5,6-0 |
| Challenger Liberec | 2021/08/02 10:35 | Daniel Siniakov v David Vega Hernandez | 6-3,7-5 |
| ITF M15 Cairo | 2021/12/01 10:35 | Kokoro Isomura v Jose Fco. Vidal Azorin | 1-6,3-6 |
| ITF M15 Cairo | 2021/11/24 08:00 | Kokoro Isomura v Fermin Tenti | 3-6,3-6 |
| ITF M15 Cairo | 2021/09/29 07:30 | Kokoro Isomura v Leonardo Aboian | 2-6,3-6 |
| ITF M15 Cairo | 2021/09/22 10:45 | Kokoro Isomura v Francesco Passaro | 2-6,5-7 |
| ITF M15 Cairo | 2021/09/14 07:00 | Jakub Wojcik v Kokoro Isomura | 6-0,7-5 |
| ITF M15 Cairo | 2021/09/13 10:00 | Belal Abou Taleb v Kokoro Isomura | 2-6,0-6 |
| ITF M15 Cairo | 2021/09/12 08:00 | Sai K R Ganta v Kokoro Isomura | 3-6,1-6 |
| ITF M15 Cairo | 2021/09/08 09:10 | Kokoro Isomura v Santiago De La Fuente | 1-6,2-6 |