Stadium: Court 1 Round: 27 Ground: Clay
| Challenger Braga MD | 2021/09/21 13:50 | Hermans/Sijsling v Arnaboldi F / Zeppieri G | 6-4,2-6,12-10 |
| Challenger Braga MD | 2021/09/22 12:15 | Heller P / Vanneste J v Bortolotti/Pellegrino | 2-6,6-2,10-5 |
| Challenger Salzburg MD | 2021/07/06 14:10 | Huesler M A / Miedler L v Heller P / Vanneste J | 7-5,6-4 |
| ITF - M15 Antalya - Doubles Hommes | 2021/05/06 11:55 | Eremin/Massara v Heller P / Vanneste J | 5-7,6-7 |
| ITF - M15 Antalya - Doubles Hommes | 2021/05/04 11:00 | Arabaci/Saritas v Heller P / Vanneste J | 2-6,4-6 |
| ITF - M15 Antalya - Doubles Hommes | 2021/04/27 13:25 | Heller P / Vanneste J v Ehrat/Martinez | 6-7,4-6 |
| ITF M25 Meerbusch MD | 2021/04/16 15:10 | Durasovic V / Eriksson M v Heller P / Vanneste J | 1-6,7-5,10-8 |
| ITF M25 Meerbusch MD | 2021/04/15 15:00 | Pichler D / Wehnelt K v Heller P / Vanneste J | 7-5,6-7,7-10 |
| ITF M25 Meerbusch MD | 2021/04/14 13:45 | Visker/Zima v Heller P / Vanneste J | 2-6,4-6 |