Stadium: M (CC) Round: 28 Ground: Clay
| ITF M15 Oldenzaal | 2021/08/20 16:35 | Guy Den Heijer v Alexander Hoogmartens | 6-3,6-7,6-4 |
| ITF M15 Oldenzaal | 2021/08/20 10:20 | Sander Jong v Guy Den Heijer | 5-7,7-5,4-6 |
| ITF M15 Oldenzaal | 2021/08/18 12:35 | Vladimir Ivanov v Guy Den Heijer | 6-4,4-6,4-6 |
| ITF M15 Oldenzaal | 2021/08/17 09:15 | Guy Den Heijer v Alexis Canter | 6-4,6-4 |
| ITF M15 Oldenzaal | 2021/08/16 10:00 | Guy Den Heijer v Noel Larwig | 6-3,6-4 |
| ITF M15 Oldenzaal | 2021/08/15 14:00 | Guy Den Heijer v Paulo Knippling | 6-3,6-4 |
| UTR Pro Tennis Series Mulheim | 2021/07/30 13:30 | Guy Den Heijer v Alexander Hoogmartens | 6-2,3-6,4-6 |
| UTR Pro Tennis Series Mulheim | 2021/07/29 13:30 | Mark Wallner v Guy Den Heijer | 2-6,3-6 |
| ITF M15 Oldenzaal | 2021/08/20 13:15 | Mark Whitehouse v Damien Wenger | 6-7,2-6 |
| ITF M15 Oldenzaal | 2021/08/19 09:00 | Christoph Negritu v Damien Wenger | 6-3,1-6,2-6 |
| ITF M15 Oldenzaal | 2021/08/18 09:55 | Ignacio Monzon v Damien Wenger | 2-6,0-6 |
| ATP Gstaad | 2021/07/17 08:30 | Steven Diez v Damien Wenger | 6-2,6-4 |
| ITF M15 Poprad | 2021/07/11 07:55 | Damien Wenger v Tomas Jirousek | 6-2,7-5 |
| ITF M15 Poprad | 2021/07/10 10:40 | Milos Karol v Damien Wenger | 3-6,6-1,2-6 |
| ITF M15 Poprad | 2021/07/09 07:55 | Cezar Cretu v Damien Wenger | 4-6,1-6 |
| ITF M15 Poprad | 2021/07/08 08:00 | Dominik Palan v Damien Wenger | 5-7,1-6 |