Stadium: Court 2 Round: 28 Ground: Clay
| ITF M25 Medellin MD | 2021/09/16 20:00 | Klier Junior/Reis da Silva v Reyes/Bogo | 6-4,6-4 |
| ITF M25 Medellin MD | 2021/09/15 20:10 | Klier Junior/Reis da Silva v Castro/Lacalle | 6-0,6-4 |
| ITF M15 Castelo Branco MD | 2021/07/29 16:15 | Coelho/Rodrigues v Klier Junior/Reis da Silva | 6-2,6-3 |
| ITF M15 Castelo Branco MD | 2021/07/27 15:15 | Araujo/Ho v Klier Junior/Reis da Silva | 1-6,4-6 |
| ITF M25 Idanha-A-Nova MD | 2021/07/24 10:50 | Klier Junior/Reis da Silva v Carr/Cozbinov | 3-6,6-2,5-10 |
| ITF M25 Idanha-A-Nova MD | 2021/07/23 12:30 | Fancutt/Hoyt v Klier Junior/Reis da Silva | 6-7,6-4,8-10 |
| ITF M25 Idanha-A-Nova MD | 2021/07/22 15:55 | Klier Junior/Reis da Silva v Jones/Noskin | 7-5,7-5 |
| ITF M25 Idanha-A-Nova MD | 2021/07/20 15:35 | Klier Junior/Reis da Silva v Marrero/Mulye | 6-4,6-4 |
| ITF M25 Medellin MD | 2021/09/16 19:00 | El Mihdawy/Sakamoto v Scott/Tacchi | 6-1,6-7,12-10 |
| ITF M25 Medellin MD | 2021/09/15 21:10 | El Mihdawy/Sakamoto v H Ramirez/Urrea | 6-3,6-3 |