Round: 44 Ground: Hardcourt outdoor
| ITF Brazil F4 Qual | 2016/07/16 12:00 | Osni Junior v Gabriel Ciro Da Silva | 7-6,6-3 |
| ITF Brazil F9 | 2014/10/13 15:50 | Osni Junior v Carlos E. Severino | 3-6,2-6 |
| Challenger Campinas Qual | 2014/09/15 13:30 | Caio Zampieri v Osni Junior | 6-2,6-2 |
| ITF Brazil F8 | 2014/08/18 14:55 | Eduardo Dischinger v Osni Junior | 6-4,6-0 |
| ITF Brazil F7 | 2014/08/13 14:55 | Pedro Sakamoto v Osni Junior | 6-1,6-0 |
| ITF Brazil F7 | 2014/08/11 14:10 | Osni Junior v Igor Marcondes | 6-4,6-4 |
| ITF Argentina F11 | 2014/07/22 16:25 | Osni Junior v Oscar Jose Gutierrez | 3-6,4-6 |
| ITF Argentina F10 | 2014/07/15 19:35 | Osni Junior v Juan Ignacio Galarza | 1-6,2-6 |
| ITF Brazil F3 | 2016/07/10 14:30 | Agustin Suarez Gonzalez v Gabriel P Tumasonis | 6-3,3-6,7-6 |
| ITF Brazil F2 | 2016/07/03 13:00 | Fermin Peralta Martinez v Gabriel P Tumasonis | 6-2,7-5 |
| ITF Brazil F2 | 2016/07/02 12:00 | Renato Lima v Gabriel P Tumasonis | 4-6,5-7 |
| ITF Brazil F1 | 2016/06/28 18:05 | Gabriel P Tumasonis v Federico Moreno | 1-6,1-6 |
| ITF Brazil F1 | 2016/06/25 13:00 | Gabriel P Tumasonis v Pedro Gabriel Rodrigues | 6-3,6-3 |
| ITF Mexico F5 | 2016/05/30 15:30 | Aron Hiltzik v Gabriel P Tumasonis | 6-2,6-3 |
| ITF Mexico F4 | 2016/05/23 15:00 | Tim Kopinski v Gabriel P Tumasonis | 6-3,7-6 |
| ITF Mexico F4 | 2016/05/22 16:30 | Gabriel P Tumasonis v Camilo Andres Erazo | 3-6,6-3,6-4 |