Stadium: Court 2 Round: 25 Ground: Clay
| ITF M15 Káhira | 2021/08/04 10:55 | Gustavo Heide v Mathys Erhard | 0-6,1-6 |
| ITF M15 Káhira | 2021/07/30 08:00 | Juan Bautista Torres v Gustavo Heide | 7-6,6-1 |
| ITF M15 Káhira | 2021/07/29 08:00 | Gustavo Heide v Kai Wehnelt | 3-6,7-5,6-3 |
| ITF M15 Káhira | 2021/07/28 12:30 | Gustavo Heide v Jaimee Floyd Angele | 6-4,2-6,6-0 |
| ITF M15 Monastir | 2021/06/01 12:35 | Robert Strombachs v Gustavo Heide | 6-0,6-4 |
| ITF M15 Monastir | 2021/05/26 14:25 | Gustavo Heide v Eliakim Coulibaly | 4-6,3-6 |
| ITF M15 Monastir | 2021/05/21 08:30 | Gustavo Heide v Yunseong Chung | 3-6,3-6 |
| ITF M15 Monastir | 2021/05/20 11:25 | Gustavo Heide v Berk Ilkel | 7-5,6-4 |