Stadium: Central Round: 62
| ITF M15 - Platja D'Aro | 2021/10/10 08:00 | Guy Den Heijer v Samir Hamza Reguig | 6-1,6-0 |
| ITF M15 - Platja D'Aro | 2021/10/08 12:00 | Guy Den Heijer v Ivan Gakhov | 5-7,4-6 |
| ITF M15 - Platja D'Aro | 2021/10/07 14:25 | Daniel Merida Aguilar v Guy Den Heijer | 3-6,2-6 |
| ITF M15 - Platja D'Aro | 2021/10/06 08:25 | Guy Den Heijer v Alexis Musialek | 5-7,6-4,6-1 |
| UTR Pro Tennis Series - Mulheim | 2021/09/25 13:30 | Colin Sinclair v Guy Den Heijer | 2-6,3-5 |
| UTR Pro Tennis Series - Mulheim | 2021/09/25 08:30 | Mikhail Minakov v Guy Den Heijer | 3-6,6-6 |
| UTR Pro Tennis Series - Mulheim | 2021/09/24 11:00 | Thijmen Loof v Guy Den Heijer | 3-6,2-6 |
| UTR Pro Tennis Series - Mulheim | 2021/09/23 08:00 | Jose A R Rodriguez v Guy Den Heijer | 6-7,2-5 |
| ITF M15 - Platja D'Aro | 2021/10/10 08:00 | Aaron Cohen v Tadas Babelis | 6-4,2-6,10-8 |
| ITF M15 - Platja D'Aro | 2021/10/03 09:30 | Aaron Cohen v Bruno P Navarro | 7-6,2-6,3-10 |
| ITF M15 - Melilla | 2021/09/24 10:00 | Aaron Cohen v Diego F Flores | 3-6,6-4,3-6 |
| ITF M15 - Melilla | 2021/09/21 09:30 | Aaron Cohen v Inigo G Olasagasti | 6-3,4-6,10-8 |
| Challenger Mallorca | 2021/08/30 09:10 | Michael Geerts v Aaron Cohen | 3-6,6-3,6-2 |
| ITF M25 - Idanha-A-Nova | 2021/07/13 10:10 | Aaron Cohen v John Echeverria | 4-6,1-6 |
| ITF M25 - Idanha-A-Nova | 2021/07/12 13:40 | Ryan Goetz v Aaron Cohen | 5-7,3-6 |
| ITF M25 - Idanha-A-Nova | 2021/07/11 13:00 | Manuel Goncalves v Aaron Cohen | 5-7,6-7 |