| UTR - Pro Tennis Series - Mulheim | 2021/07/27 08:00 | Stefan Peter Hampe v Francesco Vilardo | 2-6,4-6 |
| UTR - Pro Tennis Series - Mulheim | 2021/07/26 08:00 | Jim Hendrikx v Stefan Peter Hampe | 2-6,4-5 |
| UTR - Pro Tennis Series - Mulheim | 2021/07/26 08:00 | Hazem Naw v Alexander Hoogmartens | 6-4,5-4 |
| ITF - M15 Gaiba | 2021/06/09 16:15 | Alexander Hoogmartens v Federico Bertuccioli | 7-6,2-6,4-6 |
| ITF - M15 - Antalya | 2021/03/17 09:55 | Miljan Zekic v Alexander Hoogmartens | 5-7,7-5,6-2 |
| ITF - M15 - Antalya | 2021/03/10 08:40 | Emiliano Maggioli v Alexander Hoogmartens | 7-6,6-3 |
| ITF - M15 Manacor | 2021/01/10 12:30 | Alexander Hoogmartens v Alberto Barroso Campos | 0-6,2-6 |
| ITF - M15 - Antalya | 2021/01/07 08:40 | Alexander Hoogmartens v Stefanos Sakellaridis | 5-7,3-6 |