Stadium: Court 21 Round: 26 Ground: Hardcourt outdoor
| ITF - M15 Héraklion | 2021/11/03 12:40 | Heger, Tim v Raffael Schaer | 6-3,6-4 |
| ITF - M25 Quinta Do Lago | 2021/10/19 10:30 | Harry Wendelken v Heger, Tim | 6-1,4-6,10-8 |
| ITF - M25 Quinta Do Lago | 2021/10/18 14:05 | Illia Stoliar v Heger, Tim | 2-6,0-6 |
| ITF - M25 Loulé | 2021/10/12 11:00 | Heger, Tim v Gomes, Miguel | 3-6,0-6 |
| ITF - M25 Loulé | 2021/10/11 13:30 | Heger, Tim v Melzer, Lennart | 6-1,6-2 |
| ITF - M25 Setubal | 2021/10/06 10:00 | Heger, Tim v Henrique Rocha | 2-6,6-4,2-6 |
| ITF - M25 Setubal | 2021/10/05 10:00 | Heger, Tim v Diogo Morais | 6-1,6-1 |
| ITF - M25 Setubal | 2021/10/04 13:30 | Heger, Tim v Tomas C Abasolo | 6-4,6-3 |
| ITF - M15 Héraklion | 2021/11/02 10:45 | Sergis Kyratzis v Seelig, Kyle | 6-4,3-6,3-6 |
| ITF M15 Ithaca | 2021/10/07 14:00 | Seelig, Kyle v Radu Mihai Papoe | 2-6,6-1,2-6 |
| ITF M15 Ithaca | 2021/10/06 13:00 | Seelig, Kyle v Fellin, Pietro Orlando | 6-1,7-5 |
| ITF M25 Johannesburg | 2021/09/24 09:45 | Seelig, Kyle v Benjamin Lock | 6-7,5-7 |
| ITF M25 Johannesburg | 2021/09/23 07:00 | Ribeiro Marcondes, Igor v Seelig, Kyle | 6-1,6-7,1-6 |
| ITF M25 Johannesburg | 2021/09/22 10:05 | Goldsteiner, Peter v Seelig, Kyle | 0-6,6-2,2-6 |
| ITF M25 Johannesburg | 2021/09/14 07:50 | Seelig, Kyle v Filip Peliwo | 3-6,4-6 |
| ITF - M15 Monastir | 2021/09/05 08:30 | Seelig, Kyle v Renta Tokuda | 5-7,0-6 |