Stadium: Quadra P.A. Round: 54 Ground: Clay
| ITF M15 Sao JDR Preto | 2019/06/17 16:00 | Oscar Matias Leiva Biason v Agustin Riquelme Coppari | 3-6,5-7 |
| ITF M15 Bucaramanga | 2019/04/22 20:30 | Oscar Matias Leiva Biason v Joao M Nusdeo | 2-6,6-7 |
| ITF M15 Guayaquil | 2019/04/15 15:00 | Oscar Matias Leiva Biason v Joao M Nusdeo | 4-6,2-6 |
| ITF Chile F3 | 2018/11/24 15:00 | Oscar Gabriel Ortiz v Oscar Matias Leiva Biason | 6-2,6-4 |
| ITF Chile F2 | 2018/11/17 16:00 | Oscar Matias Leiva Biason v Mateo Berne | 6-3,3-6,3-6 |
| ITF Chile F1 | 2018/11/12 13:00 | Oscar Matias Leiva Biason v Federico Juan Aguilar | 1-6,3-6 |
| ITF Belgium F7 Qual | 2018/08/05 08:00 | Nico Mertens v Oscar Matias Leiva Biason | 6-1,6-0 |
| ITF Belgium F7 Qual | 2018/08/04 07:30 | Oscar Matias Leiva Biason v Javier A V. Meza | 6-0,6-0 |
| ITF Dominican Republic F3 | 2018/12/09 14:00 | Franco Feitt v Bernardo A P E Oliveira | 6-3,6-3 |
| ITF Dominican Republic F2 | 2018/12/02 15:00 | Lucas Gessner v Bernardo A P E Oliveira | 2-6,6-2,7-5 |
| ITF Dominican Republic F2 | 2018/12/01 15:30 | Bernardo A P E Oliveira v Victor Bertoldo | 6-2,6-4 |
| ITF Dominican Republic F1 | 2018/11/25 15:00 | John Harrison Richmond v Bernardo A P E Oliveira | 5-7,6-7 |
| ITF Dominican Republic F1 | 2018/11/24 16:00 | Felipe Santamaria v Bernardo A P E Oliveira | 4-6,2-6 |
| ITF Brazil F9 | 2018/11/12 15:10 | Bernardo A P E Oliveira v Daniil Zarichanskiy | 6-7,0-6 |
| ITF Brazil F8 | 2018/11/04 15:30 | Fabio Costa v Bernardo A P E Oliveira | 6-3,6-1 |
| ITF Brazil F8 | 2018/11/03 16:30 | Bernardo A P E Oliveira v Eber Tiepermann | 6-1,6-0 |