Stadium: Court 1 Round: 29 Ground: Clay
| 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 M25 Medellín | 2021/09/18 14:50 | Pedro Sakamoto v Gilbert S K Junior | 3-6,6-7 |
| ITF M25 Medellín | 2021/09/17 15:00 | Gilbert S K Junior v Alan Kohen | 6-2,4-6,6-1 |
| ITF M25 Medellín | 2021/09/16 15:00 | Gilbert S K Junior v Mateo Gomez | 6-3,6-3 |
| ITF M25 Medellín | 2021/09/14 18:05 | Gilbert S K Junior v Enrique Bogo | 6-1,6-2 |
| ITF M25 Poznaň | 2021/08/25 10:00 | Harry Wendelken v Gilbert S K Junior | 3-6,6-4,6-2 |
| ITF M15 Lodž | 2021/08/21 08:00 | Gilbert S K Junior v Maciej Rajski | 4-6,6-7 |
| ITF M15 Lodž | 2021/08/20 10:15 | Daniel Michalski v Gilbert S K Junior | 6-4,3-6,3-6 |
| ITF M15 Lodž | 2021/08/19 10:00 | Tommaso Compagnucci v Gilbert S K Junior | 4-6,2-6 |
| ITF M25 Medellín | 2021/09/18 15:00 | Gerardo L Villasenor v Joao Lucas Reis da Silva | 2-6,6-7 |
| ITF M25 Medellín | 2021/09/17 14:50 | Juan Sebastian Gomez v Joao Lucas Reis da Silva | 1-6,4-6 |
| ITF M25 Medellín | 2021/09/16 16:25 | Daniel Antonio Nunez v Joao Lucas Reis da Silva | 5-7,4-6 |
| ITF M25 Medellín | 2021/09/14 19:40 | Johan A Rodriguez Rodriguez v Joao Lucas Reis da Silva | 3-6,1-6 |
| 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 |