Stadium: Court 2 Round: 27 Ground: Clay
| ITF M15 Vejle | 2021/07/30 11:30 | Jonathan Mridha v Simon Yitbarek | 6-1,6-3 |
| ITF M15 Vejle | 2021/07/28 10:10 | Jonathan Mridha v Petro Orlando Fellin | 6-3,0-6,6-4 |
| ITF M25 Marburg | 2021/07/09 09:00 | Nick Hardt v Jonathan Mridha | 6-4,7-6 |
| ITF M25 Marburg | 2021/07/08 11:25 | Jonathan Mridha v Marvin Netuschil | 6-4,7-6 |
| ITF M25 Marburg | 2021/07/06 17:25 | Jonathan Mridha v Wilson Leite | 6-2,6-4 |
| ITF M15 Monastir | 2021/04/29 08:30 | Arthur Bouquier v Jonathan Mridha | 3-6,6-4,6-4 |
| ITF M15 Monastir | 2021/04/28 08:25 | Alexander Donski v Jonathan Mridha | 5-7,7-6,6-7 |
| ITF M15 Monastir | 2021/04/23 14:00 | Oscar Jose Gutierrez v Jonathan Mridha | 6-4,6-3 |
| ITF M15 Vejle | 2021/07/29 16:30 | Guy Den Ouden v Mick Veldheer | 6-4,6-0 |
| ITF M15 Vejle | 2021/07/28 11:50 | Sebastian Prechtel v Guy Den Ouden | 2-6,2-6 |
| ITF M15 Esch/Alzette | 2021/07/20 13:00 | Jeffrey Von Der Schulenburg v Guy Den Ouden | 6-4,3-6,7-5 |
| Challenger Amersfoort | 2021/07/11 14:00 | Guy Den Ouden v Diego Hidalgo | 3-6,6-7 |
| ITF M25 Marburg | 2021/07/05 12:05 | Yan Sabanin v Guy Den Ouden | 7-6,6-4 |
| ITF M25 The Hague | 2021/06/28 10:15 | Guy Den Ouden v Henri Squire | 2-6,0-6 |
| ITF M25 Alkmaar | 2021/06/23 10:35 | Deney Wassermann v Guy Den Ouden | 7-6,7-5 |
| ITF M15 Sharm El Sheikh | 2020/11/19 10:10 | Guy Den Ouden v Miljan Zekic | 6-7,6-7 |