Stadium: Court 5 Round: 28 Ground: Clay
| Orlando, Singles Qualifying W-WITF-USA-02A | 2018/03/07 15:00 | Stewart, Katerina v Kremen, Ilona | 6-1,4-6,6-0 |
| Tampa, Singles Qualifying W-WITF-USA-08A | 2018/03/15 14:00 | Kremen, Ilona v Hailey Baptiste | 6-2,6-3 |
| Tampa, Singles Qualifying W-WITF-USA-08A | 2018/03/14 17:00 | Moreno-Kaste, Daniella v Kremen, Ilona | 1-6,1-6 |
| Orlando, Singles Qualifying W-WITF-USA-02A | 2018/03/07 15:00 | Stewart, Katerina v Kremen, Ilona | 6-1,4-6,6-0 |
| ITF Women Rancho Santa Fe Qual | 2018/02/19 19:00 | Robin Anderson v Kremen, Ilona | 6-3,6-0 |
| ITF Women Rancho Santa Fe Qual | 2018/02/18 22:00 | Thoma, Alexis v Kremen, Ilona | 0-6,0-6 |
| Surprise, Singles Qualifying W-WITF-USA-05A | 2018/02/11 17:00 | Weinhold, Ashley v Kremen, Ilona | 6-4,6-3 |
| Wesley Chapel, Singles Qualifying W-WITF-USA-03A | 2018/01/21 16:30 | Marcela Zacarias v Kremen, Ilona | 6-1,6-1 |
| ITF Women Orlando Qual | 2018/01/15 15:00 | Reka-Luca Jani v Kremen, Ilona | 6-0,6-4 |
| 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 |
| ITF Women Sao Paulo | 2018/03/01 14:00 | Stewart, Katerina v Haas, Barbara | 6-1,2-6,1-6 |
| ITF Women Sao Paulo | 2018/02/27 13:00 | Carolina Alves v Stewart, Katerina | 5-7,1-6 |