Stadium: Court 11 Round: 25
| ITF Women Surprise | 2018/02/15 20:45 | Julia Boserup v Elitsa Kostova | 7-5,3-6,6-1 |
| WTA Newport Beach | 2018/01/23 18:00 | Rebecca Peterson v Elitsa Kostova | 4-6,6-3,7-5 |
| WTA Newport Beach Qual | 2018/01/21 18:00 | Caroline Dolehide v Elitsa Kostova | 4-6,4-6 |
| WTA Newport Beach Qual | 2018/01/20 20:15 | Emina Bektas v Elitsa Kostova | 2-6,7-5,1-6 |
| Australian Open Women Qual | 2018/01/13 02:15 | Elitsa Kostova v Denisa Allertova | 6-7,2-6 |
| Australian Open Women Qual | 2018/01/10 23:00 | Asia Muhammad v Elitsa Kostova | 1-6,6-3,5-7 |
| WTA Auckland Qual | 2017/12/29 22:50 | Jana Fett v Elitsa Kostova | 6-2,6-1 |
| ITF Women Norman | 2017/11/16 19:10 | Maria Sanchez v Elitsa Kostova | 6-4,6-4 |
| ITF Women Rancho Santa Fe Qual | 2018/02/20 20:00 | Brynn Boren v Ashley Lahey | 6-3,4-6,2-6 |
| ITF Women Rancho Santa Fe Qual | 2018/02/19 19:00 | Bianca Turati v Ashley Lahey | 4-6,5-7 |
| ITF Women Rancho Santa Fe Qual | 2018/02/18 20:30 | Safiya Carrington v Ashley Lahey | 3-6,2-6 |
| US Open Women Qual | 2017/08/22 21:05 | Ashley Lahey v Sofya Zhuk | 0-6,5-7 |
| ITF Women Stockton | 2017/07/18 19:40 | Ashley Kratzer v Ashley Lahey | 6-3,7-6 |
| ITF Women Auburn | 2017/06/30 14:30 | Ellen Perez v Ashley Lahey | 6-3,5-7,7-5 |
| ITF Women Auburn | 2017/06/29 14:00 | Ashley Lahey v Chieh-Yu Hsu | 6-2,5-7,6-3 |
| ITF Women Auburn | 2017/06/28 18:25 | Emiliana Arango v Ashley Lahey | 6-2,0-6,3-6 |