Stadium: Court 2 Round: 27 Ground: Clay
| ITF - Sarajewo M15 | 2021/06/03 12:05 | Joao Lucas Reis da Silva v Michal Novansky | 6-3,6-0 |
| ITF - Sarajewo M15 | 2021/06/02 12:20 | Joao Lucas Reis da Silva v Nemanja Malesevic | 6-3,6-4 |
| ITF - Kiseljak M25 | 2021/05/26 10:25 | Jelle Sels v Joao Lucas Reis da Silva | 6-3,6-2 |
| ITF - Brcko M15 | 2021/05/22 07:30 | Bastian Malla v Joao Lucas Reis da Silva | 6-1,7-6 |
| ITF - Brcko M15 | 2021/05/21 13:20 | Maximilian Neuchrist v Joao Lucas Reis da Silva | 4-6,4-6 |
| ITF - Brcko M15 | 2021/05/21 06:55 | Dusan Milanovic v Joao Lucas Reis da Silva | 4-6,4-6 |
| ITF - Prijedor M15 | 2021/05/14 07:00 | Joao Lucas Reis da Silva v Aldin Setkic | 2-6,2-6 |
| ITF - Prijedor M15 | 2021/05/12 10:30 | Joao Lucas Reis da Silva v Tim Heger | 6-3,7-5 |
| ITF - Sarajewo M15 | 2021/06/03 10:50 | Luka Petrovic v Din Karahodza | 6-1,7-5 |
| ITF - Sarajewo M15 | 2021/06/02 14:05 | Luka Petrovic v Aleksandar Mihailovic | 6-4,6-0 |
| ITF - Sarajewo M15 | 2021/06/01 09:00 | Petar Jovanovic v Luka Petrovic | 3-6,7-5,9-11 |
| ITF - Sarajewo M15 | 2021/05/31 12:00 | Max Van Wijk v Luka Petrovic | 3-6,2-6 |
| ITF - Brcko M15 | 2021/05/17 15:30 | Lazar Vojinovic v Luka Petrovic | 6-3,6-4 |
| ITF - Brcko M15 | 2021/05/16 09:30 | Mario Aleksic v Luka Petrovic | 1-6,1-3 |
| ITF - Cairo M15 | 2021/05/03 12:30 | Leonardo Catani v Luka Petrovic | 7-6,1-6,10-3 |
| ITF - Cairo M15 | 2021/05/02 13:30 | Luka Petrovic v Amr Asrawy | 7-6,6-4 |