Stadium: Court 2 Round: 27 Ground: Hardcourt outdoor
| ITF M15 Almada | 2021/07/08 12:30 | Joao Lucas Reis da Silva v Daniel Batista | 6-2,6-3 |
| ITF M15 Almada | 2021/07/06 10:30 | Joao Lucas Reis da Silva v Kuzey Cekirge | 6-1,6-3 |
| ITF M25 The Hague | 2021/07/01 12:10 | Jelle Sels v Joao Lucas Reis da Silva | 6-3,6-3 |
| ITF M25 The Hague | 2021/06/30 10:00 | Niels Visker v Joao Lucas Reis da Silva | 6-4,4-6,4-6 |
| ITF M25 Alkmaar | 2021/06/22 17:00 | Joao Lucas Reis da Silva v Jelle Sels | 5-7,1-6 |
| ITF M15 Antalya | 2021/06/16 14:05 | Joao Lucas Reis da Silva v Fermin Tenti | 2-6,5-7 |
| ITF M15 Antalya | 2021/06/10 09:10 | Joao Lucas Reis da Silva v Francisco Comesana | 4-6,6-7 |
| ITF M15 Antalya | 2021/06/08 09:15 | Yu Hsiou Hsu v Joao Lucas Reis da Silva | 5-7,6-7 |
| ITF M15 Almada | 2021/07/08 11:15 | Diego F Flores v Takuto Niki | 6-7,6-3,6-4 |
| ITF M15 Almada | 2021/07/07 10:30 | Diego F Flores v Luis Faria | 6-3,6-7,6-3 |
| ITF M25 Bakio | 2021/06/29 09:30 | Diego F Flores v Gabriel Diaz Freire | 6-1,6-7,12-14 |
| UTR Pro Tennis Series Barcelona | 2021/06/13 10:00 | Diego F Flores v Jose Joaquin M Cisneros | 6-1,6-0 |
| UTR Pro Tennis Series Barcelona | 2021/06/12 08:30 | Sergio Martos Gornes v Diego F Flores | 3-6,4-5 |
| UTR Pro Tennis Series Barcelona | 2021/06/11 08:00 | Alexandre Reco v Diego F Flores | 6-1,6-4 |
| UTR Pro Tennis Series Barcelona | 2021/06/10 11:00 | Marcelo Zormann v Diego F Flores | 7-6,6-4 |
| UTR Pro Tennis Series Barcelona | 2021/06/08 09:30 | Kuzey Cekirge v Diego F Flores | 2-6,6-1,6-5 |