Stadium: Court 2 Round: 62 Ground: Clay
| ITF M15 Oldenzaal | 2021/08/15 14:00 | Guy Den Heijer v Paulo Knippling | 6-3,6-4 |
| UTR Pro Tennis Series Mulheim | 2021/07/30 13:30 | Guy Den Heijer v Alexander Hoogmartens | 6-2,3-6,4-6 |
| UTR Pro Tennis Series Mulheim | 2021/07/29 13:30 | Mark Wallner v Guy Den Heijer | 2-6,3-6 |
| UTR Pro Tennis Series Mulheim | 2021/07/29 07:00 | Matthew Thomson v Guy Den Heijer | 1-6,3-6 |
| UTR Pro Tennis Series Mulheim | 2021/07/27 09:30 | Billy Harris v Guy Den Heijer | 3-6,2-6 |
| UTR Pro Tennis Series Mulheim | 2021/07/26 11:00 | Guy Den Heijer v Tim Sandkaulen | 7-5,6-3 |
| ITF M25 Marburg | 2021/07/07 10:50 | Aleksandre Metreveli v Guy Den Heijer | 6-3,1-6,6-2 |
| ITF M25 Marburg | 2021/07/06 12:25 | Guy Den Heijer v Florian Broska | 6-3,7-6 |
| ITF M15 Oldenzaal | 2021/08/15 12:00 | Jannik Rother v Noel Larwig | 6-4,1-6,6-10 |
| ITF M15 Antalya | 2021/06/01 07:00 | Noel Larwig v Franco Roncadelli | 2-6,3-6 |
| ITF M15 Antalya | 2021/05/31 07:30 | Umut Akkoyun v Noel Larwig | 4-6,1-6 |
| ITF M15 Antalya | 2021/05/30 07:30 | Lewie Lane v Noel Larwig | 6-7,4-6 |
| ITF M15 Antalya | 2021/05/23 07:00 | Giorgio Tabacco v Noel Larwig | 6-2,6-2 |
| ITF M15 Antalya | 2021/05/17 07:00 | Mariano Navone v Noel Larwig | 6-3,6-2 |
| ITF M15 Antalya | 2021/05/16 07:00 | Danylo Veremeychuk v Noel Larwig | 3-6,6-3,8-10 |
| ITF M15 Troisdorf | 2021/05/09 13:00 | Leon Hoeveler v Noel Larwig | 6-3,6-0 |