Stadion: Court 3 Round: 25 Ground: Clay
| 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 - Antalya | 2021/03/02 09:00 | Joao Lucas Reis da Silva v Simone Roncalli | 6-2,6-3 |
| ITF - M15 - Prijedor | 2021/05/11 09:30 | Alen Rogic-Hadzalic v Tim Heger | 6-3,4-6,7-10 |
| ITF - M15 - Prijedor | 2021/05/10 13:30 | Nicolas Zanellato v Tim Heger | 6-4,3-6,7-10 |
| ITF - M15 - Prijedor | 2021/05/09 12:30 | Tadija Radovanovic v Tim Heger | 3-6,3-6 |
| ITF - M15 - Sibenik | 2021/04/21 08:00 | Tim Heger v Marco Miceli | 3-6,4-6 |
| ITF - M15 - Sibenik | 2021/04/20 10:05 | George Botezan v Tim Heger | 6-3,4-6,9-11 |
| ITF - M15 - Sibenik | 2021/04/19 14:30 | Borna Devald v Tim Heger | 3-6,2-6 |
| ITF - M15 - Opatija | 2021/03/21 11:00 | Ivan Karlo Ban v Tim Heger | 6-3,2-6,10-8 |
| ITF - M15 - Rovinj | 2021/03/15 09:30 | Tim Heger v Frane Nincevic | 6-7,4-6 |