Stadium: Court B 2 Round: 25 Ground: Clay
| Irapuato, Singles W-WITF-MEX-01A | 2018/03/13 21:10 | Kukharchuk, Nika v Jovic, J. | 5-7,2-6 |
| Irapuato, Singles Qualifying W-WITF-MEX-01A | 2018/03/11 18:20 | Kukharchuk, Nika v Coppola, Claudia | 6-1,7-5 |
| Sao Paulo, Singles Qualifying W-WITF-BRA-02A | 2018/02/26 15:30 | Moore, Tara v Kukharchuk, Nika | 6-4,6-7,7-5 |
| Sao Paulo, Singles Qualifying W-WITF-BRA-02A | 2018/02/25 16:00 | Silva de Carvalho, Juliana v Kukharchuk, Nika | 2-6,3-6 |
| Sao Paulo, Singles Qualifying W-WITF-BRA-02A | 2018/02/24 15:30 | Villarreal, Andrea Renee v Kukharchuk, Nika | 2-6,4-6 |
| ITF Women Curitiba Qual | 2018/02/19 16:05 | Kukharchuk, Nika v Ryngler, Alexa | 1-6,6-7 |
| ITF Women Curitiba Qual | 2018/02/18 16:55 | Kukharchuk, Nika v Madison Bourguignon | 6-2,7-6 |
| ITF Women Hammamet | 2018/02/08 10:20 | Kukharchuk, Nika v Burnett, Nastassya | 3-6,3-6 |
| Tampa, Singles Qualifying W-WITF-USA-08A | 2018/03/18 14:00 | Jessica Pegula v Stewart, Katerina | 2-6,3-6 |
| Tampa, Singles Qualifying W-WITF-USA-08A | 2018/03/17 14:00 | Kremen, Ilona v Stewart, Katerina | 1-6,0-6 |
| Tampa, Singles Qualifying W-WITF-USA-08A | 2018/03/16 14:00 | Neel, Ingrid v Stewart, Katerina | 4-6,4-6 |
| Tampa, Singles Qualifying W-WITF-USA-08A | 2018/03/15 16:15 | Emmanuelle Salas v Stewart, Katerina | 6-7,0-6 |
| Tampa, Singles Qualifying W-WITF-USA-08A | 2018/03/13 15:30 | Zhuravleva, Angelina v Stewart, Katerina | 2-6,0-6 |
| Orlando, Singles Qualifying W-WITF-USA-02A | 2018/03/09 18:55 | Stewart, Katerina v Sophie Chang | 6-7,4-6 |
| Orlando, Singles Qualifying W-WITF-USA-02A | 2018/03/08 17:40 | Stewart, Katerina v Flink, Varvara | 3-6,7-6,6-2 |
| Orlando, Singles Qualifying W-WITF-USA-02A | 2018/03/07 15:00 | Stewart, Katerina v Kremen, Ilona | 6-1,4-6,6-0 |