Stadium: Centre Round: 27 Ground: Clay
| ITF M25 Most | 2021/05/27 10:45 | Ergi Kirkin v Daniel Michalski | 4-6,0-6 |
| ITF M25 Most | 2021/05/26 11:10 | Petr Cervinka v Daniel Michalski | 1-6,1-6 |
| ITF M15 Antalya | 2021/05/14 07:00 | Orlando Luz v Daniel Michalski | 6-3,6-4 |
| ITF M15 Antalya | 2021/05/13 09:35 | Dragos Nicolae Madaras v Daniel Michalski | 7-5,5-7,2-6 |
| ITF M15 Antalya | 2021/05/12 11:30 | Pierre Yves Bailly v Daniel Michalski | 6-1,2-6,3-6 |
| ITF M15 Cairo | 2021/04/25 09:00 | Oliver Crawford v Daniel Michalski | 6-2,5-7,6-3 |
| ITF M15 Cairo | 2021/04/24 09:00 | Daniel Michalski v Daniele Capecchi | 2-6,7-6,6-1 |
| ITF M15 Cairo | 2021/04/23 09:00 | Shintaro Mochizuki v Daniel Michalski | 6-3,6-7,4-6 |
| ITF M25 Most | 2021/05/27 08:00 | Alex Rybakov v Filip Peliwo | 6-1,6-2 |
| ITF M25 Most | 2021/05/26 07:55 | Alex Rybakov v Martin Damm | 6-4,6-2 |
| ITF M25 Vic | 2021/05/18 08:00 | Alex Rybakov v Pedro Vives Marcos | 2-6,4-6 |
| ITF M25 Vic | 2021/05/17 09:00 | Alex Rybakov v Max Alcala Gurri | 6-2,7-5 |
| ITF M15 Valldoreix | 2021/05/11 11:00 | Alex Rybakov v Martin Cuevas | 5-7,3-6 |
| ITF M15 Majadahonda | 2021/05/07 11:35 | Matteo Martineau v Alex Rybakov | 6-4,5-7,7-6 |
| ITF M15 Majadahonda | 2021/05/06 10:45 | Alex Rybakov v Daniel Rincon | 6-4,6-3 |
| ITF M15 Majadahonda | 2021/05/05 11:55 | Max Alcala Gurri v Alex Rybakov | 0-6,4-6 |