Stadium: Centre Court Round: 62 Ground: Clay
| ITF M15 Oldenzaal | 2021/08/21 10:10 | Guy Den Heijer v Damien Wenger | 4-6,2-6 |
| 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 |
| ITF M25 Eupen | 2021/09/05 09:00 | Lofo Ramiaramanana v Yannick Lenaerts | 3-6,6-2,9-11 |
| ITF M15 Huy | 2021/08/22 11:05 | Yannick Lenaerts v Charles Minc | 1-6,2-6 |
| ITF M15 Sharm El Sheikh | 2019/11/11 10:00 | Hanyi Liu v Yannick Lenaerts | 6-4,6-2 |
| ITF M15 Sharm El Sheikh | 2019/11/10 10:00 | Yannick Lenaerts v Preston Connor | 6-1,6-2 |
| ITF M15 Sharm El Sheikh | 2019/11/06 11:00 | Yannick Lenaerts v Stijn Pel | 3-6,2-6 |
| ITF M15 Forbach | 2019/09/23 09:55 | Yannick Lenaerts v Paul-Georg Guenther | 3-6,6-7 |
| ITF M25 Plaisir | 2019/09/15 15:25 | Yannick Lenaerts v Warren Sinius | 5-7,3-6 |
| ITF M15 Varna | 2019/09/11 10:00 | Benjamin Niv v Yannick Lenaerts | 6-2,6-3 |