| ITF Women Setubal Qual | 2018/07/07 09:30 | Marta Oliveira v Kelly Williford | 1-6,2-6 |
| ITF Women Corroios-Seixal | 2018/07/01 11:30 | Madison Westby v Kelly Williford | 6-3,6-1 |
| 2018 Fed Cup | 2018/06/23 18:25 | Kelly Williford v Yusleydis Smith Dias | 3-6,5-7 |
| 2018 Fed Cup | 2018/06/22 16:10 | Marcela Zacarias v Kelly Williford | 6-4,6-1 |
| ITF Women Obidos Qual | 2018/06/04 09:30 | Kelly Williford v Ekaterina Shalimova | 2-6,1-6 |
| ITF Women Obidos Qual | 2018/05/26 09:30 | Luisa Pelayo v Kelly Williford | 4-6,6-4,6-4 |
| ITF Women Oeiras | 2018/05/20 12:00 | Kelly Williford v Isabel A Gallego | 4-6,5-7 |
| ITF Women Tiberias | 2018/05/15 07:00 | Kelly Williford v Yuval Keren | 2-6,1-6 |
| ITF Women Corroios-Seixal | 2018/07/05 11:00 | Eden Silva v Kumi So | 6-2,6-3 |
| ITF Women Corroios-Seixal | 2018/07/03 11:30 | Clemence Fayol v Kumi So | 6-2,4-6,3-6 |
| ITF Women Sharm El Sheikh | 2018/04/10 08:00 | Kumi So v Iryna Shymanovich | 4-6,4-6 |
| ITF Women Sharm El Sheikh | 2018/04/05 11:00 | Angelina Gabueva v Kumi So | 6-2,6-3 |
| ITF Women Sharm El Sheikh | 2018/04/04 08:00 | Kumi So v Rutuja Bhosale | 6-2,6-2 |
| ITF Women Yokohama Qual | 2018/03/04 02:30 | Harriet Dart v Kumi So | 6-3,6-3 |
| ITF Women Sharm El Sheikh | 2018/02/03 08:00 | Kumi So v Nadja Gilchrist | 1-6,3-6 |
| ITF Women Sharm El Sheikh | 2018/02/02 08:00 | Berfu Cengiz v Kumi So | 5-7,6-4,4-6 |