Stadium: Court 1 Round: 25 Ground: Hardcourt indoor
| Challenger Banja Luka | 2021/09/08 15:30 | Andrej Martin v Jonathan Mridha | 6-3,7-5 |
| Challenger Banja Luka | 2021/09/07 09:55 | Jonathan Mridha v Dominic Stephan Stricker | 6-2,6-3 |
| Challenger Banja Luka | 2021/09/06 09:00 | Elmar Ejupovic v Jonathan Mridha | 6-2,2-6,2-6 |
| Challenger Banja Luka | 2021/09/05 09:00 | Jonathan Mridha v Markus Eriksson | 6-3,6-2 |
| ITF M15 Zilina | 2021/09/02 12:15 | Adria Soriano Barrera v Jonathan Mridha | 6-7,6-4,6-3 |
| ITF M15 Zilina | 2021/09/01 08:00 | Hamid Reza Nadaf v Jonathan Mridha | 2-6,2-6 |
| Challenger Warsaw | 2021/08/24 11:30 | Johan Nikles v Jonathan Mridha | 6-4,6-7,6-3 |
| Challenger Warsaw | 2021/08/22 12:15 | Jonathan Mridha v David Poljak | 2-6,6-4,6-2 |
| ITF M25 Ricany | 2021/09/01 11:40 | Antonin Bolardt v Simon Freund | 6-2,1-6,6-4 |
| ITF M15 Bratislava | 2021/08/26 07:55 | Vasil Kirkov v Simon Freund | 6-0,6-1 |
| ITF M15 Bratislava | 2021/08/25 11:35 | Simon Freund v Obrad Markovski | 6-3,6-4 |
| ITF M25 The Hague | 2021/06/27 08:00 | Simon Freund v Lodewijk Weststrate | 1-6,3-6 |
| ITF M25 Alkmaar | 2021/06/23 09:00 | Simon Freund v Javier Barranco Cosano | 2-6,6-7 |
| ITF M25 Alkmaar | 2021/06/21 14:30 | Simon Freund v Tom Pisane | 6-0,6-1 |
| ITF M25 Alkmaar | 2021/06/20 13:30 | Simon Freund v Buvaysar Gadamauri | 6-2,7-5 |
| ITF M15 Helsinki | 2021/06/02 08:10 | Simon Freund v Sean Cuenin | 2-6,6-4,4-6 |