Stadium: Court 4 Round: 26 Ground: Clay
| 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 |
| ITF M15 Monastir | 2021/05/18 11:00 | Santiago Rodriguez Taverna v Gustavo Heide | 6-7,6-0,5-7 |
| ITF M15 Monastir | 2021/05/11 08:25 | Mohamed Aziz Dougaz v Gustavo Heide | 6-1,6-2 |
| ITF M15 Monastir | 2021/05/07 08:30 | Luca Potenza v Gustavo Heide | 7-6,6-3 |
| ITF M15 Káhira | 2021/07/28 14:20 | Facundo Arias Bisso v Kai Wehnelt | 5-7,5-7 |
| ITF M15 Káhira | 2021/07/24 08:00 | Mathieu Perchicot v Kai Wehnelt | 6-3,1-6,7-5 |
| ITF M15 Káhira | 2021/07/23 07:55 | Kai Wehnelt v Lorenzo Bocchi | 3-6,6-4,6-2 |
| ITF M15 Káhira | 2021/07/22 08:00 | Kai Wehnelt v Leonid Sheyngezikht | 6-3,6-1 |
| ITF M15 Káhira | 2021/07/21 08:00 | Kai Wehnelt v Artur Soghoyan | 6-3,6-3 |
| ITF M25 Alkmaar | 2021/06/24 08:00 | Mats Rosenkranz v Kai Wehnelt | 6-1,4-6,5-7 |
| ITF M25 Alkmaar | 2021/06/23 16:10 | Kai Wehnelt v Sander Jong | 6-2,7-6 |
| ITF M25 Alkmaar | 2021/06/21 16:00 | Kai Wehnelt v Deney Wassermann | 5-7,6-3,12-10 |