Stadium: Centre Court 1 Round: 26
| ITF Women Sao Paulo | 2018/02/27 13:00 | Carolina Alves v Katerina Stewart | 5-7,1-6 |
| ITF Women Sao Paulo Qual | 2018/02/26 14:40 | Katerina Stewart v Eduarda Piai | 6-0,6-3 |
| ITF Women Sao Paulo Qual | 2018/02/25 16:00 | Katerina Stewart v Carla Lucero | 6-2,6-0 |
| ITF Women Sao Paulo Qual | 2018/02/24 15:30 | Katerina Stewart v Julieta Lara Estable | 7-5,6-2 |
| ITF Women Wesley Chapel | 2018/01/24 16:35 | Katerina Stewart v Whitney Osuigwe | 3-6,5-7 |
| ITF Women Orlando Qual | 2018/01/15 15:00 | Katerina Stewart v Chihiro Muramatsu | 3-6,6-7 |
| ITF Women Orlando Qual | 2018/01/14 15:00 | Katerina Stewart v Catherine Leduc | 6-2,6-1 |
| ITF Women Waco | 2017/11/09 16:00 | Sofia Kenin v Katerina Stewart | 6-1,6-1 |
| ITF Women Sao Paulo | 2018/02/28 13:00 | Tara Moore v Barbara Haas | 6-7,4-6 |
| ITF Women Curitiba | 2018/02/21 22:10 | Katie Swan v Barbara Haas | 6-3,6-0 |
| 2018 Fed Cup | 2018/02/10 10:05 | Ekaterine Gorgodze v Barbara Haas | 6-7,6-2,3-6 |
| 2018 Fed Cup | 2018/02/08 10:45 | Cagla Buyukakcay v Barbara Haas | 4-6,7-6,6-4 |
| ITF Women Glasgow | 2018/01/31 10:00 | Chantal Skamlova v Barbara Haas | 2-6,7-6,7-5 |
| Australian Open Women Qual | 2018/01/10 23:00 | Yafan Wang v Barbara Haas | 6-4,6-3 |
| WTA Hua Hin | 2017/11/10 09:25 | Barbara Haas v Su-Wei Hsieh | 1-6,5-7 |
| WTA Hua Hin | 2017/11/08 08:45 | Ipek Soylu v Barbara Haas | 7-6,2-6,4-6 |