Stadium: Stadium Court Round: 25 Ground: Hardcourt outdoor
| ITF M15 Sao Paulo | 2019/10/16 14:00 | Conner Huertas Del Pino v Christian Oliveira | 6-3,6-3 |
| ITF M15 Sao Paulo | 2019/10/15 16:45 | Christian Oliveira v Gaston Erhardt | 7-6,6-3 |
| ITF M25 Rio de Janeiro | 2019/10/11 15:35 | Christian Oliveira v Felipe Meligeni Rodrigues Alves | 2-6,4-6 |
| ITF M25 Rio de Janeiro | 2019/10/08 17:30 | Christian Oliveira v Mauricio Echazu | 6-1,4-6,6-3 |
| ITF M15 Buenos Aires | 2019/09/15 12:00 | Mateo Berne v Christian Oliveira | 6-4,6-1 |
| ITF M15 Lambare | 2019/08/21 15:30 | Gonzalo Villanueva v Christian Oliveira | 6-1,7-6 |
| ITF M15 Lambare | 2019/08/20 14:00 | Christian Oliveira v Bruno Britez | 6-4,7-6 |
| ITF M15 Lambare | 2019/08/19 14:00 | Christian Oliveira v Vicente M R Maturana | 6-2,7-5 |
| ITF M25 Madrid | 2021/09/16 11:45 | Pablo Llamas Ruiz v Oscar Jose Gutierrez | 6-3,6-3 |
| ITF M25 Madrid | 2021/09/14 09:00 | Pol Toledo Bague v Oscar Jose Gutierrez | 3-6,2-6 |
| ITF M25 Oviedo | 2021/09/02 09:00 | Oscar Jose Gutierrez v Alejandro Garcia | 2-6,3-6 |
| ITF M25 Oviedo | 2021/09/01 12:40 | Oscar Jose Gutierrez v Diego A B Sanchez | 6-3,7-5 |
| ITF M25 Oviedo | 2021/08/31 10:15 | Oscar Jose Gutierrez v Juan Bautista Torres | 6-3,6-4 |
| ITF M25 Santander | 2021/08/27 10:30 | Imanol L Morillo v Oscar Jose Gutierrez | 6-3,6-3 |
| ITF M25 Santander | 2021/08/26 09:00 | Andrey Chepelev v Oscar Jose Gutierrez | 3-6,5-7 |
| ITF M25 Santander | 2021/08/24 10:15 | Kuzey Cekirge v Oscar Jose Gutierrez | 7-5,2-6,1-6 |