| UTR Pro Tennis Series Mulheim | 2021/09/22 09:30 | Thijmen Loof v Lawrence Bataljin | 6-3,5-3 |
| UTR Pro Tennis Series Mulheim | 2021/09/21 11:00 | Thijmen Loof v Jose Antonio Rodriguez Rodriguez | 7-6,5-4 |
| UTR Pro Tennis Series Mulheim | 2021/09/20 12:30 | Buvaysar Gadamauri v Thijmen Loof | 6-1,6-4 |
| ITF M25 Plaisir | 2021/09/12 14:10 | Jordan Betesh v Thijmen Loof | 6-3,6-3 |
| ITF M25 Sintra | 2021/09/05 08:30 | Thijmen Loof v Matias P D L Gomila | 6-7,6-3,8-10 |
| ITF M25 Poznań | 2021/08/22 08:00 | Thijmen Loof v Flemming Peters | 5-7,3-6 |
| ITF M15 Łódź | 2021/08/17 08:00 | Aristotelis Thanos v Thijmen Loof | 6-1,6-3 |
| ITF M15 Łódź | 2021/08/16 09:30 | Thijmen Loof v Adam Bronka | 6-2,6-4 |
| 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 |
| UTR Pro Tennis Series Mulheim | 2021/09/20 12:30 | Guy Den Heijer v Lawrence Bataljin | 6-0,5-1 |
| ITF M25 Eupen | 2021/09/09 09:00 | Romain Faucon v Guy Den Heijer | 6-4,6-4 |
| ITF M25 Eupen | 2021/09/08 07:30 | Guy Den Heijer v Kai Wehnelt | 3-6,6-3,6-2 |
| ITF M25 Eupen | 2021/09/07 10:05 | Guy Den Heijer v Tom Gentzsch | 6-3,6-4 |
| ITF M25 Eupen | 2021/09/06 14:45 | Guy Den Heijer v Yannick Lenaerts | 6-1,6-0 |
| ITF M15 Oldenzaal | 2021/08/21 10:10 | Guy Den Heijer v Damien Wenger | 4-6,2-6 |