Stadion: Court 2 Round: 26 Ground: Clay
| ITF - M15 - Prijedor | 2021/05/12 10:30 | Joao Lucas Reis da Silva v Tim Heger | 6-3,7-5 |
| ITF - M15 - Córdoba | 2021/04/06 15:45 | Joao Lucas Reis da Silva v Luciano Darderi | 3-6,5-7 |
| ITF - M15 - Villa Maria | 2021/04/01 13:00 | Conner Huertas Del Pino v Joao Lucas Reis da Silva | 6-3,7-5 |
| ITF - M15 - Villa Maria | 2021/03/30 19:10 | Francisco Comesana v Joao Lucas Reis da Silva | 4-6,3-6 |
| ITF - M15 - Antalya | 2021/03/10 08:35 | Joao Lucas Reis da Silva v Ergi Kirkin | 3-6,4-6 |
| ITF - M15 - Antalya | 2021/03/06 07:15 | Joao Lucas Reis da Silva v Dragos Nicolae Madaras | 2-6,1-6 |
| ITF - M15 - Antalya | 2021/03/05 07:00 | Sebastian Gima v Joao Lucas Reis da Silva | 4-6,1-6 |
| ITF - M15 - Antalya | 2021/03/04 07:00 | Joao Lucas Reis da Silva v Matias Zukas | 5-7,6-4,7-6 |
| ITF - M15 - Prijedor | 2021/05/13 07:50 | Rimpei Kawakami v Aldin Setkic | 2-6,4-6 |
| ITF - M15 - Sibenik | 2021/04/25 09:00 | David Pichler v Aldin Setkic | 6-7,3-6 |
| ITF - M15 - Sibenik | 2021/04/24 10:05 | Aldin Setkic v Sebastian Prechtel | 4-6,6-2,7-5 |
| ITF - M15 - Sibenik | 2021/04/23 09:45 | Aldin Setkic v Gergely Madarasz | 6-3,6-1 |
| ITF - M15 - Sibenik | 2021/04/22 09:15 | Aldin Setkic v Sean Cuenin | 6-1,6-3 |
| ITF - M15 - Sibenik | 2021/04/21 11:20 | Aldin Setkic v Peter Goldsteiner | 6-2,6-4 |
| ITF - M15 - Sharm El Sheikh | 2021/04/09 07:30 | Mukund Sasikumar v Aldin Setkic | 6-4,6-7,6-1 |
| ITF - M15 - Sharm El Sheikh | 2021/04/08 09:15 | Andrew Paulson v Aldin Setkic | 0-6,5-7 |