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 Hoogmartens, Alexander | 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 | Ivanov, Vladimir 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 Larwig, Noel | 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 Hoogmartens, Alexander | 6-2,3-6,4-6 |
| ITF M25 Eupen | 2021/09/05 09:00 | Ramiaramanan, Lofo v Lenaerts, Yannick | 3-6,6-2,9-11 |
| ITF M15 Huy | 2021/08/22 11:05 | Lenaerts, Yannick v Minc, Charles | 1-6,2-6 |
| ITF - M15 Sharm El Sheikh | 2019/11/11 10:00 | Hanyi Liu v Lenaerts, Yannick | 6-4,6-2 |
| ITF - M15 Sharm El Sheikh | 2019/11/10 10:00 | Lenaerts, Yannick v Connor, Preston | 6-1,6-2 |
| ITF - M15 Sharm El Sheikh | 2019/11/06 11:00 | Lenaerts, Yannick v Stijn Pel | 3-6,2-6 |
| ITF M15 Forbach | 2019/09/23 09:55 | Lenaerts, Yannick v Guenther, Paul-Georg | 3-6,6-7 |
| ITF M25 Plaisir | 2019/09/15 15:25 | Lenaerts, Yannick v Sinius, Warren | 5-7,3-6 |
| Varna, Singles M-ITF-BUL-04A | 2019/09/11 10:00 | Niv, Benjamin v Lenaerts, Yannick | 6-2,6-3 |