Stadium: Court 01 Round: 27 Ground: Clay
| ITF M15 Warmbad-Villach | 2021/08/19 07:55 | Peter Heller v Maximilian Homberg | 7-5,6-1 |
| ITF M15 Warmbad-Villach | 2021/08/18 08:00 | Peter Heller v Andrea Guerrieri | 6-1,6-1 |
| ITF M25 Wetzlar | 2021/08/08 10:00 | Peter Heller v Christopher Heyman | 6-4,6-7,6-4 |
| ITF M25 Wetzlar | 2021/08/07 11:00 | David Pichler v Peter Heller | 3-6,7-5,3-6 |
| ITF M25 Wetzlar | 2021/08/06 15:55 | Constantin Schmitz v Peter Heller | 3-6,7-5,1-6 |
| ITF M25 Wetzlar | 2021/08/05 09:00 | Georgii Kravchenko v Peter Heller | 6-7,2-6 |
| ITF M25 Wetzlar | 2021/08/04 08:00 | Marvin Moeller v Peter Heller | 2-6,3-6 |
| Challenger Salzburg | 2021/07/08 10:30 | Nicolas Jarry v Peter Heller | 6-2,6-4 |
| ITF M15 Warmbad-Villach | 2021/08/19 14:35 | Matic Spec v Lukas Neumayer | 2-6,3-6 |
| ITF M15 Warmbad-Villach | 2021/08/17 14:50 | Lukas Neumayer v Quentin Folliot | 7-5,6-1 |
| ATP Kitzbühel | 2021/07/27 10:35 | Mario Vilella Martinez v Lukas Neumayer | 6-7,7-5,6-4 |
| ATP Kitzbühel | 2021/07/25 11:20 | Lukas Neumayer v Lukas Rosol | 6-4,7-6 |
| ITF M25 Kottingbrunn | 2021/07/21 09:30 | Martin Krumich v Lukas Neumayer | 7-5,6-2 |
| ITF M25 Telfs | 2021/07/18 14:30 | Bogdan Ionut Apostol v Lukas Neumayer | 6-7,6-2,6-4 |
| ITF M25 Telfs | 2021/07/18 10:00 | Gonzalo Lama v Lukas Neumayer | 6-7,6-7 |
| ITF M25 Telfs | 2021/07/16 11:00 | Giovanni Oradini v Lukas Neumayer | 4-6,4-6 |