Stadium: Court 12 Round: 62
| 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 |
| UTR Pro Tennis Series Mulheim | 2021/09/21 13:00 | Buvaysar Gadamauri v Guy Den Heijer | 6-4,6-6 |
| ITF M15 Cairo | 2021/09/14 07:00 | Samir Hamza Reguig v Maikel De Boes | 3-6,4-6 |
| ITF M15 Cairo | 2021/09/13 08:00 | Krittin Koaykul v Samir Hamza Reguig | 1-6,0-6 |
| ITF M15 Cairo | 2021/09/12 12:30 | Ashraf El Sayed v Samir Hamza Reguig | 1-6,3-6 |
| ITF M15 Cairo | 2021/09/07 07:30 | Valerio Aboian v Samir Hamza Reguig | 6-4,6-0 |
| ITF M15 Cairo | 2021/09/05 08:30 | Samir Hamza Reguig v Egill Sigurdsson | 3-6,6-3,16-14 |
| ITF M15 Cairo | 2021/08/31 08:00 | Valerio Aboian v Samir Hamza Reguig | 6-3,7-5 |
| ITF M15 Cairo | 2021/08/30 10:30 | Samir Hamza Reguig v Omar El-Moslemany | 6-1,6-4 |
| ITF M15 Cairo | 2021/08/29 08:00 | Tobias Franco v Samir Hamza Reguig | 2-6,6-4,8-10 |