Stadion: M (CC) Round: 25 Ground: Clay
| ITF - M15 - Monastir | 2021/08/11 07:30 | Grigoriy Lomakin v Alec Deckers | 3-6,6-3,6-4 |
| ITF - M15 - Monastir | 2021/08/01 10:00 | Mateo Nicolas Martinez v Alec Deckers | 6-7,7-5,10-7 |
| ITF - M15 - Monastir | 2021/07/28 08:00 | Gabriele Bosio v Alec Deckers | 7-6,6-2 |
| ITF - M15 - Monastir | 2021/07/26 14:00 | Joshua Paris v Alec Deckers | 4-6,6-7 |
| ITF - M15 - Monastir | 2021/07/26 08:00 | Alec Deckers v Matthew Dellavedova | 7-5,2-6,10-7 |
| ITF - M15 - Monastir | 2021/07/25 09:00 | Skander Ben Abdallah v Alec Deckers | 2-6,3-6 |
| ITF - M25 - Den Haag | 2021/06/27 08:00 | Marvin Netuschil v Alec Deckers | 6-4,6-2 |
| ITF - M25 - Alkmaar | 2021/06/20 17:00 | Alec Deckers v Guy Den Heijer | 3-6,7-6,4-10 |
| ITF - M15 - Frederiksberg | 2021/08/05 10:00 | Ryan Nijboer v Benjamin Hannestad | 1-6,6-4,2-6 |
| ITF - M15 - Frederiksberg | 2021/08/04 09:25 | Ryan Nijboer v Leyton Rivera | 6-4,6-2 |
| ITF - M15 - Vejle | 2021/07/28 12:50 | Christian Sigsgaard v Ryan Nijboer | 6-3,6-2 |
| Challenger - Amersfoort | 2021/07/13 10:15 | Ryan Nijboer v Johan Nikles | 6-7,2-6 |
| ITF - M25 - Marburg | 2021/07/10 11:00 | Ryan Nijboer v Nick Hardt | 2-6,4-6 |
| ITF - M25 - Marburg | 2021/07/09 12:00 | Ryan Nijboer v Milan Welte | 4-6,6-3,6-1 |
| ITF - M25 - Marburg | 2021/07/08 09:00 | Ryan Nijboer v Tim Handel | 6-3,6-4 |
| ITF - M25 - Marburg | 2021/07/07 09:00 | Yan Sabanin v Ryan Nijboer | 0-6,3-6 |