Stadium: Court 3 Round: 25 Ground: Clay
| ITF M15 Ibagué | 2021/09/08 17:00 | Johan A Rodriguez Rodriguez v Gustavo Heide | 6-4,6-7,4-6 |
| ITF M15 Ibagué | 2021/09/07 15:40 | Joao Lucas Reis da Silva v Blu Baker | 6-4,3-6,3-6 |
| ITF M15 Castelo Branco | 2021/07/31 08:30 | Joao Lucas Reis da Silva v Gilbert S K Junior | 6-4,2-6,6-7 |
| ITF M15 Castelo Branco | 2021/07/30 08:30 | Duarte Vale v Joao Lucas Reis da Silva | 7-6,4-6,5-7 |
| ITF M15 Castelo Branco | 2021/07/29 11:30 | Pedro Araujo v Joao Lucas Reis da Silva | 4-6,4-6 |
| ITF M15 Castelo Branco | 2021/07/27 12:00 | Alafia Ayeni v Joao Lucas Reis da Silva | 4-6,4-6 |
| ITF M25 Idanha-A-Nova | 2021/07/21 08:00 | Joao Lucas Reis da Silva v Marek Gengel | 5-7,0-6 |
| ITF M25 Idanha-A-Nova | 2021/07/16 07:55 | Nicolas Moreno De Alboran v Joao Lucas Reis da Silva | 7-6,6-4 |
| ITF M25 Idanha-A-Nova | 2021/07/15 10:15 | Luis Faria v Joao Lucas Reis da Silva | 6-4,2-6,3-6 |