Stadium: Court 1 Round: 28 Ground: Hardcourt outdoor
| 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 |
| ITF M25 Idanha-A-Nova | 2021/07/13 12:30 | Joao Lucas Reis da Silva v Yusuke Takahashi | 6-3,6-1 |
| ITF M15 Almada | 2021/07/10 08:30 | Fabio Coelho v Joao Lucas Reis da Silva | 6-3,6-4 |
| ITF M15 Castelo Branco | 2021/07/30 10:00 | Gilbert S K Junior v Sho Shimabukuro | 7-6,6-3 |
| ITF M15 Castelo Branco | 2021/07/29 08:30 | Garrett Johns v Gilbert S K Junior | 5-7,3-6 |
| ITF M15 Castelo Branco | 2021/07/27 08:30 | Vilius Gaubas v Gilbert S K Junior | 4-6,3-6 |
| ITF M25 Idanha-A-Nova | 2021/07/24 08:30 | Gilbert S K Junior v Simon Carr | 2-6,6-7 |
| ITF M25 Idanha-A-Nova | 2021/07/23 09:00 | Anton Matusevich v Gilbert S K Junior | 3-6,3-6 |
| ITF M25 Idanha-A-Nova | 2021/07/22 08:00 | Gilbert S K Junior v Roy Smith | 6-3,6-2 |
| ITF M25 Idanha-A-Nova | 2021/07/21 09:50 | Garrett Johns v Gilbert S K Junior | 5-7,1-6 |
| ITF M15 Sarajevo | 2021/06/03 09:00 | Gilbert S K Junior v Matheus Pucinelli De Almeida | 6-4,3-6,3-6 |