Stadium: CEE Logistics-C8 Round: 29 Ground: Clay
| ITF M15 Vejle | 2021/07/29 16:30 | Guy Den Ouden v Veldheer, Mick | 6-4,6-0 |
| ITF M15 Allershausen | 2021/09/04 13:10 | Guy Den Ouden v Mats Rosenkranz | 6-4,4-6,6-4 |
| ITF M15 Allershausen | 2021/09/03 12:35 | Guy Den Ouden v Galarza, Juan Ignacio | 7-5,6-3 |
| ITF M15 Allershausen | 2021/09/02 13:40 | Peter Heller v Guy Den Ouden | 6-7,3-6 |
| ITF M15 Allershausen | 2021/09/01 11:30 | Guy Den Ouden v Hazem Naw | 6-4,3-6,6-4 |
| ITF M15 Huy | 2021/08/29 13:00 | Gauthier Onclin v Guy Den Ouden | 6-4,5-7,1-6 |
| ITF M15 Huy | 2021/08/28 11:00 | Raphael Collignon v Guy Den Ouden | 3-6,4-6 |
| ITF M15 Huy | 2021/08/27 11:00 | Dhoe, Benjamin v Guy Den Ouden | 2-6,2-6 |
| ITF M15 Huy | 2021/08/26 11:45 | Guy Den Ouden v Perchicot, Mathieu | 7-5,6-4 |
| ITF M15 Allershausen | 2021/09/04 10:00 | Veldheer, Mick v David Jorda Sanchis | 6-3,6-7,6-1 |
| ITF M15 Allershausen | 2021/09/03 10:00 | Manish Sureshkumar v Veldheer, Mick | 1-6,6-4,0-6 |
| ITF M15 Allershausen | 2021/09/02 11:45 | Maximilian Homberg v Veldheer, Mick | 3-6,2-6 |
| ITF M15 Allershausen | 2021/08/31 11:25 | Schmitz, Constantin v Veldheer, Mick | 6-7,4-6 |
| ITF M25 Trier | 2021/08/27 12:00 | Marvin Moeller v Veldheer, Mick | 6-3,6-3 |
| ITF M25 Trier | 2021/08/26 09:30 | Bulitski, Aliaksandr v Veldheer, Mick | 3-6,3-6 |
| ITF M25 Trier | 2021/08/24 10:00 | Romios, Matthew Christopher v Veldheer, Mick | 1-6,0-6 |
| ITF M25 Frankfurt am Main | 2021/08/12 09:00 | Veldheer, Mick v Oriol Roca Batalla | 4-6,6-2,4-6 |