Stadium: Court 9 Round: 62 Ground: Clay
| Sao Paulo, Singles Qualifying W-WITF-BRA-02A | 2018/02/25 16:00 | Stewart, Katerina v Lucero, Carla | 6-2,6-0 |
| Sao Paulo, Singles Qualifying W-WITF-BRA-02A | 2018/02/24 15:30 | Stewart, Katerina v Julieta Lara Estable | 7-5,6-2 |
| Wesley Chapel, Singles W-WITF-USA-03A | 2018/01/24 16:35 | Stewart, Katerina v Whitney Osuigwe | 3-6,5-7 |
| ITF Women Orlando Qual | 2018/01/15 15:00 | Stewart, Katerina v Chihiro Muramatsu | 3-6,6-7 |
| ITF Women Orlando Qual | 2018/01/14 15:00 | Stewart, Katerina v Leduc, Catherine | 6-2,6-1 |
| ITF Women Waco | 2017/11/09 16:00 | Sofia Kenin v Stewart, Katerina | 6-1,6-1 |
| ITF Women Waco | 2017/11/08 16:00 | Stewart, Katerina v Marand, Sanaz | 4-6,6-0,7-5 |
| ITF Women Waco Qual | 2017/11/07 16:00 | Stewart, Katerina v Whoriskey, Caitlin | 6-1,4-6,6-3 |
| Sao Paulo, Singles Qualifying W-WITF-BRA-02A | 2018/02/25 16:00 | Wolf Gasparin, Nathalia v Piai, Eduarda | 4-6,6-4,3-6 |
| Sao Paulo, Singles Qualifying W-WITF-BRA-02A | 2018/02/24 15:30 | Julia Konishi Camargo Silva v Piai, Eduarda | 1-6,1-6 |
| ITF Women Curitiba Qual | 2018/02/18 18:00 | Elysia Bolton v Piai, Eduarda | 7-5,6-2 |
| ITF Women Curitiba Qual | 2018/02/17 16:00 | Lopez, Daniela Macarena v Piai, Eduarda | 0-6,3-6 |
| ITF Women Santa Cruz | 2017/12/14 00:10 | Kurata, Nathaly v Piai, Eduarda | 6-4,6-1 |
| ITF Women Santa Cruz | 2017/12/11 21:30 | Salinas, Susan v Piai, Eduarda | 0-6,0-6 |
| ITF Women Cantanduva | 2017/12/03 13:00 | Kurata, Nathaly v Piai, Eduarda | 6-1,6-4 |
| ITF Women Cantanduva | 2017/12/02 18:25 | Lucero, Carla v Piai, Eduarda | 2-6,6-7 |