Stadium: Stadium Court Round: 25 Ground: Clay
| 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 Montauban | 2021/06/25 14:00 | Arthur Cazaux v Oscar Jose Gutierrez | 6-3,6-2 |
| ITF M25 Montauban | 2021/06/24 13:30 | Oscar Jose Gutierrez v Nathan Seateun | 6-2,7-5 |
| ITF M25 Montauban | 2021/06/22 10:00 | Erik Crepaldi v Oscar Jose Gutierrez | 1-6,2-6 |
| Challenger Aix en Provence | 2021/06/15 13:05 | Renzo Olivo v Oscar Jose Gutierrez | 7-6,6-4 |
| Challenger Aix en Provence | 2021/06/14 08:30 | Mohamed Aziz Dougaz v Oscar Jose Gutierrez | 6-4,4-6,6-4 |
| Challenger Aix en Provence | 2021/06/13 08:30 | Ronald Slobodchikov v Oscar Jose Gutierrez | 1-6,4-6 |
| UTR Pro Tennis Series Barcelona | 2021/06/12 11:30 | Marcelo Zormann v Oscar Jose Gutierrez | 3-0 |
| UTR Pro Tennis Series Barcelona | 2021/06/11 11:00 | Bruno P Navarro v Oscar Jose Gutierrez | 6-7,4-6 |