Stadium: Court 4 Round: 25
| ITF M15 Heraklion | 2020/02/12 08:00 | Guy Den Heijer v Alexis Musialek | 4-6,3-6 |
| 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 |
| 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 M15 Ulcinj | 2021/09/24 09:00 | Samuel Vincent Ruggeri v Alexis Musialek | 7-6,6-1 |
| ITF M15 Ulcinj | 2021/09/23 09:30 | Matija Samardzic v Alexis Musialek | 1-6,0-6 |
| ITF M15 Ulcinj | 2021/09/21 09:55 | Gabriele Piraino v Alexis Musialek | 3-6,7-5,5-7 |
| ITF M15 Ulcinj | 2021/09/16 08:00 | Samuel Vincent Ruggeri v Alexis Musialek | 7-6,6-1 |
| ITF M15 Ulcinj | 2021/09/15 09:30 | Ivan Liutarevich v Alexis Musialek | 1-6,2-6 |
| ITF M25 Santander | 2021/08/25 10:00 | Alexis Musialek v Imanol L Morillo | 3-6,0-6 |
| ITF M15 Pescara | 2021/08/19 14:25 | Gian Marco Ortenzi v Alexis Musialek | 6-4,6-4 |
| ITF M15 Pescara | 2021/08/17 10:25 | Gabriele Piraino v Alexis Musialek | 4-6,2-6 |