Stadium: Court 5 Round: 44 Ground: Clay
| ITF M15 Lodz | 2021/08/17 08:00 | Aristotelis Thanos v Thijmen Loof | 6-1,6-3 |
| ITF M15 Lodz | 2021/08/16 09:30 | Thijmen Loof v Adam Bronka | 6-2,6-4 |
| ITF M15 Lodz | 2021/08/15 11:00 | Michal Wozniak v Thijmen Loof | 1-6,5-7 |
| ITF M15 Xativa | 2021/08/01 07:00 | Thijmen Loof v Mario Mansilla Diez | 2-6,2-6 |
| ITF M15 Antalya | 2021/06/22 09:10 | Marco Furlanetto v Thijmen Loof | 3-6,6-4,3-10 |
| ITF M15 Antalya | 2021/06/21 07:00 | Thijmen Loof v Michal Mikula | 6-2,6-1 |
| ITF M15 Antalya | 2021/06/20 07:00 | Hamza Ben Yaacoub v Thijmen Loof | 3-6,0-6 |
| ITF M15 Antalya | 2021/03/29 07:00 | Thijmen Loof v Luca Tomasetto | 4-6,2-6 |
| ITF M15 Oldenzaal | 2021/08/15 07:30 | Zachary Eisinga v Flemming Peters | 6-0,6-3 |
| ITF M15 Sarajevo | 2021/05/30 10:30 | Matej Galik v Flemming Peters | 6-1,4-6,10-8 |
| ITF M25 Kiseljak | 2021/05/24 12:15 | Lilian Breut v Flemming Peters | 2-6,6-3,10-7 |
| ITF M25 Kiseljak | 2021/05/23 13:15 | Flemming Peters v Maxim Krapivin | 3-6,7-5,10-6 |
| ITF M15 Troisdorf | 2021/05/10 08:00 | Flemming Peters v Sidane Pontjodikromo | 4-6,1-6 |
| ITF M15 Troisdorf | 2021/05/09 08:00 | Maurus Malgiaritta v Flemming Peters | 6-2,3-6,8-10 |
| ITF M15 Antalya | 2021/05/04 07:00 | Flemming Peters v Karl Friberg | 3-6,5-7 |
| ITF M15 Antalya | 2021/04/25 07:00 | Flemming Peters v Vojtech Mares | 3-6,3-6 |