Stadium: Center Court Round: 28 Ground: Clay
| ITF M25 Wetzlar | 2021/08/06 10:55 | David Pichler v Henri Squire | 4-6,6-4,6-4 |
| ITF M25 Wetzlar | 2021/08/05 10:40 | David Pichler v Daniel Cukierman | 6-2,6-4 |
| ITF M25 Wetzlar | 2021/08/04 14:30 | Julian Lenz v David Pichler | 1-6,5-7 |
| ITF M25 Kottingbrunn | 2021/07/22 09:40 | Lenny Hampel v David Pichler | 7-6,6-2 |
| ITF M25 Kottingbrunn | 2021/07/21 09:25 | Tadeas Paroulek v David Pichler | 6-4,2-6,4-6 |
| ITF M25 Velenje | 2021/07/07 09:05 | Patrik Rikl v David Pichler | 6-3,4-6,6-2 |
| ITF M15 Gaiba | 2021/06/09 10:40 | Kirill Kivattsev v David Pichler | 4-6,6-3,6-3 |
| ITF M25 Kiseljak | 2021/05/27 10:40 | David Pichler v Hernan Casanova | 3-6,3-6 |
| 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 |
| Challenger Salzburg | 2021/07/05 10:35 | Francisco Cerundolo v Peter Heller | 3-6,6-3,3-6 |
| ITF M15 Antalya | 2021/05/06 08:10 | Nick Hardt v Peter Heller | 3-6,6-0,7-5 |
| ITF M15 Antalya | 2021/05/05 08:55 | Karl Friberg v Peter Heller | 3-6,3-6 |
| ITF M15 Antalya | 2021/05/01 07:30 | Peter Heller v Jeroen Vanneste | 3-6,3-6 |