Stadium: Court 4 Round: 25
| ITF M15 Heraklion | 2020/02/12 08:00 | Guy Den Heijer v Alexis Musialek | 4-6,3-6 |
| 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 |
| ITF M15 Oldenzaal | 2021/08/20 16:35 | Guy Den Heijer v Alexander Hoogmartens | 6-3,6-7,6-4 |
| ITF M15 Oldenzaal | 2021/08/20 10:20 | Sander Jong v Guy Den Heijer | 5-7,7-5,4-6 |
| ITF M15 Oldenzaal | 2021/08/18 12:35 | Vladimir Ivanov v Guy Den Heijer | 6-4,4-6,4-6 |
| 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 |
| ITF M15 Gdynia | 2021/08/14 09:30 | Alexis Musialek v Roman Andres Burruchaga | 1-6,3-6 |
| ITF M15 Gdynia | 2021/08/13 09:00 | Pawel Juszczak v Alexis Musialek | 3-6,6-0,5-7 |
| ITF M15 Gdynia | 2021/08/12 10:25 | Szymon Kielan v Alexis Musialek | 3-6,4-6 |