Stadium: Court 4 Round: 25 Ground: Clay
| ITF M15 Brcko | 2021/05/18 09:30 | Dusan Milanovic v Pavle Daljev | 6-0,6-4 |
| ITF M15 Brcko | 2021/05/17 15:30 | Besir Durguti v Dusan Milanovic | 3-6,2-6 |
| ITF M15 Brcko | 2021/05/16 12:30 | Samuel M Arjona v Dusan Milanovic | 7-6,4-6,1-10 |
| ITF M15 Prijedor | 2021/05/14 07:00 | Joao Lucas Reis da Silva v Aldin Setkic | 2-6,2-6 |
| ITF M15 Prijedor | 2021/05/12 10:30 | Joao Lucas Reis da Silva v Tim Heger | 6-3,7-5 |
| ITF M15 Cordoba | 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 |