Stadium: C Round: 25 Ground: Clay
| US Open Women Qual | 2017/08/22 21:10 | Kristie Ahn v Katerina Stewart | 6-4,7-5 |
| ITF Women Jackson | 2018/04/07 17:00 | Anhelina Kalinina v Katerina Stewart | 6-3,6-2 |
| ITF Women Jackson | 2018/04/06 16:00 | Katerina Stewart v Tamaryn Hendler | 6-0,6-0 |
| ITF Women Jackson | 2018/04/05 16:30 | Iga Swiatek v Katerina Stewart | 2-6,1-6 |
| ITF Women Jackson | 2018/04/03 18:30 | Nika Kukharchuk v Katerina Stewart | 1-6,1-6 |
| ITF Women Tampa | 2018/03/18 14:00 | Jessica Pegula v Katerina Stewart | 2-6,3-6 |
| ITF Women Tampa | 2018/03/17 14:00 | Ilona Kremen v Katerina Stewart | 1-6,0-6 |
| ITF Women Tampa | 2018/03/16 14:00 | Ingrid Neel v Katerina Stewart | 4-6,4-6 |
| ITF Women Tampa | 2018/03/15 16:15 | Emmanuelle Salas v Katerina Stewart | 6-7,0-6 |
| WTA Charleston | 2018/04/04 14:00 | Julia Goerges v Kristie Ahn | 2-6,6-4,7-6 |
| WTA Charleston | 2018/04/03 15:25 | Kristie Ahn v Samantha Stosur | 6-2,6-4 |
| WTA Miami Qual | 2018/03/19 15:45 | Stefanie Voegele v Kristie Ahn | 7-5,6-2 |
| WTA Indian Wells Qual | 2018/03/06 20:50 | Lara Arruabarrena v Kristie Ahn | 7-5,6-3 |
| WTA Indian Wells Qual | 2018/03/05 22:20 | Carol Zhao v Kristie Ahn | 6-4,6-7,2-6 |
| WTA Indian Wells | 2018/03/01 22:55 | Kristie Ahn v Sara Errani | 4-6,0-6 |
| WTA Indian Wells | 2018/02/28 00:25 | Taylor Townsend v Kristie Ahn | 5-7,1-6 |
| Australian Open Women | 2018/01/16 00:00 | Kristie Ahn v Barbora Strycova | 1-6,5-7 |