Stadium: Court 4 Round: 25 Ground: Hardcourt outdoor
| Challenger Eckental | 2021/11/01 11:55 | Tobias Simon v Peter Heller | 6-2,6-4 |
| ITF M15 Antalya | 2021/10/26 08:25 | Peter Heller v Jack Pinnington Jones | 3-6,4-6 |
| Challenger Lisbon | 2021/09/27 09:00 | Santiago Rodriguez Taverna v Peter Heller | 7-6,7-5 |
| Challenger Lisbon | 2021/09/26 11:25 | Luis Faria v Peter Heller | 1-6,7-6,4-6 |
| Challenger Braga | 2021/09/21 09:00 | Thiago Monteiro v Peter Heller | 6-3,6-3 |
| Challenger Braga | 2021/09/19 09:00 | Miguel Gomes v Peter Heller | 0-6,1-6 |
| ITF M15 Allershausen | 2021/09/02 13:40 | Peter Heller v Guy Den Ouden | 6-7,3-6 |
| ITF M15 Allershausen | 2021/09/01 11:15 | Peter Heller v Henri Squire | 6-3,3-6,6-4 |