Stadium: Center Court Round: 45 Ground: Hardcourt outdoor
| ITF Women Bogota | 2018/12/03 14:30 | Vivian Mayumi Toma v Hailey Wilcox | 1-6,1-6 |
| ITF Women Mexico City | 2018/10/29 20:05 | Solymar Colling v Vivian Mayumi Toma | 6-0,6-0 |
| ITF Women Florence | 2018/10/14 17:00 | Paula Cristina Goncalves v Vivian Mayumi Toma | 6-0,6-0 |
| ITF Women Buenos Aires | 2018/09/17 16:40 | Victoria Ariadna Beccio v Vivian Mayumi Toma | 6-1,6-0 |
| ITF Women Nonthaburi | 2018/09/01 07:00 | Vivian Mayumi Toma v Min Liu | 1-6,0-6 |
| ITF Women Nonthaburi | 2018/08/25 02:00 | Natthapat Piwbangruk v Vivian Mayumi Toma | 6-3,6-1 |
| ITF Women Evansville | 2018/07/23 15:00 | Vivian Mayumi Toma v Mayuka Aikawa | 1-6,0-6 |
| ITF Women Victoria | 2018/06/18 20:00 | Vivian Mayumi Toma v Brynn Boren | 0-6,1-6 |