Stadium: Court 6 Round: 26 Ground: Hardcourt outdoor
| ITF M15 Monastir | 2021/09/29 10:45 | Guy Den Ouden v Mohamed Amine Aissa Khelifa | 6-0,6-3 |
| ITF M15 Monastir | 2021/09/22 08:00 | Guy Den Ouden v Ryota Tanuma | 6-7,2-6 |
| ITF M15 Allershausen | 2021/09/05 11:00 | Guy Den Ouden v Mick Veldheer | 6-0,6-4 |
| ITF M15 Allershausen | 2021/09/04 13:10 | Guy Den Ouden v Mats Rosenkranz | 6-4,4-6,6-4 |
| ITF M15 Allershausen | 2021/09/03 12:35 | Guy Den Ouden v Juan Ignacio Galarza | 7-5,6-3 |
| ITF M15 Allershausen | 2021/09/02 13:40 | Peter Heller v Guy Den Ouden | 6-7,3-6 |
| ITF M15 Allershausen | 2021/09/01 11:30 | Guy Den Ouden v Hazem Naw | 6-4,3-6,6-4 |
| ITF M15 Huy | 2021/08/29 13:00 | Gauthier Onclin v Guy Den Ouden | 6-4,5-7,1-6 |
| ITF M15 Monastir | 2021/09/29 10:40 | Raphael Collignon v Lukas Neumayer | 5-7,6-3,2-6 |
| Challenger Tulln | 2021/09/07 10:35 | Lukas Neumayer v Jiri Vesely | 5-7,6-7 |
| ITF M15 Bad Waltersdorf | 2021/09/03 10:00 | Omar Giacalone v Lukas Neumayer | 6-3,7-6 |
| ITF M15 Bad Waltersdorf | 2021/09/02 09:25 | Lukas Neumayer v Tom Kocevar-Desman | 7-5,6-2 |
| ITF M15 Bad Waltersdorf | 2021/09/01 09:45 | Alen Rogic-Hadzalic v Lukas Neumayer | 6-7,0-6 |
| ITF M15 Bad Waltersdorf | 2021/08/25 07:00 | Lukas Neumayer v Timo Stodder | 4-6,3-6 |
| ITF M15 Warmbad-Villach | 2021/08/20 12:15 | Peter Heller v Lukas Neumayer | 6-2,3-6,6-3 |
| ITF M15 Warmbad-Villach | 2021/08/19 14:35 | Matic Spec v Lukas Neumayer | 2-6,3-6 |