Stadium: Court 9 Round: 54 Ground: Clay
| ITF M25 Trier | 2021/08/25 09:00 | Max Wiskandt v Raphael Calzi | 7-5,4-6,2-6 |
| ITF M25 Trier | 2021/08/23 11:30 | Max Wiskandt v Tristan Reiff | 6-3,6-2 |
| ITF M25 Trier | 2021/08/23 08:30 | Max Wiskandt v Tom Diederich | 6-2,6-4 |
| ITF M25 Ueberlingen | 2021/08/18 08:00 | Henri Squire v Max Wiskandt | 6-4,6-3 |
| ITF M25 Frankfurt am Main | 2021/08/09 11:55 | Max Wiskandt v Niklas Schell | 6-3,3-6,5-10 |
| ITF M25 Wetzlar | 2021/08/04 12:55 | Matthew Romios v Max Wiskandt | 6-4,6-3 |
| ITF M25 Marburg | 2021/07/06 16:15 | Max Wiskandt v Kyrian Jacquet | 6-2,6-4 |
| ITF M25 Alkmaar | 2021/06/20 11:00 | Marvin Moeller v Max Wiskandt | 7-6,6-3 |
| ITF M25 Eupen | 2021/09/08 15:30 | Simon Beaupain v Alexander Hoogmartens | 7-5,3-6,6-3 |
| ITF M15 Oldenzaal | 2021/08/20 16:35 | Guy Den Heijer v Alexander Hoogmartens | 6-3,6-7,6-4 |
| ITF M15 Oldenzaal | 2021/08/19 12:45 | Alexander Hoogmartens v Ryan Nijboer | 1-6,7-5,6-3 |
| ITF M15 Oldenzaal | 2021/08/18 07:55 | Alexander Hoogmartens v Deney Wassermann | 2-6,7-6,6-0 |
| UTR Pro Tennis Series Mulheim | 2021/07/31 08:30 | Vasile Antonescu v Alexander Hoogmartens | 5-7,7-6,6-1 |
| 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 | 2021/07/30 07:00 | Francesco Vilardo v Alexander Hoogmartens | 1-6,2-5 |
| UTR Pro Tennis Series Mulheim | 2021/07/29 08:30 | Jim Hendrikx v Alexander Hoogmartens | 4-6,3-6 |