Stadium: Court 5 Round: 25
| ITF Women SJD Campos | 2018/03/16 15:00 | Dominique Schaefer v Stephanie Mariel Petit | 6-0,5-7,7-6 |
| ITF Women SJD Campos | 2018/03/15 17:30 | Akiko Okuda v Stephanie Mariel Petit | 1-6,2-6 |
| ITF Women SJD Campos | 2018/03/14 22:30 | Marina Figueiredo v Stephanie Mariel Petit | 2-6,1-6 |
| ITF Women Campinas | 2018/03/06 14:00 | Victoria Bosio v Stephanie Mariel Petit | 6-4,6-3 |
| ITF Women Sao Paulo Qual | 2018/02/26 16:25 | Gabriela Ce v Stephanie Mariel Petit | 6-4,6-1 |
| ITF Women Sao Paulo Qual | 2018/02/25 14:30 | Flavia Guimaraes Bueno v Stephanie Mariel Petit | 3-6,2-6 |
| ITF Women Sao Paulo Qual | 2018/02/24 15:30 | Nicolly Ferreira v Stephanie Mariel Petit | 0-6,1-6 |
| 2018 Fed Cup | 2018/02/10 18:30 | Maria Paulina Perez Garcia v Stephanie Mariel Petit | 4-6,4-6 |