Stadium: Court 1 Round: 27 Ground: Clay
| s-Hertogenbosch, Netherlands, Qualifying | 2018/06/09 09:50 | Piter, Katarzyna v Haas, Barbara | 6-3,6-4 |
| ITF W25 Prague | 2019/08/29 12:25 | Haas, Barbara v Carreras, Amanda | 6-0,7-5 |
| ITF W25 Prague | 2019/08/28 13:20 | Haas, Barbara v Nikola Tomanova | 6-3,6-3 |
| US Open Women | 2019/08/19 20:00 | Xinyu Wang v Haas, Barbara | 6-1,5-7,6-2 |
| ITF W60 Hechingen | 2019/08/11 11:30 | Olga Danilovic v Haas, Barbara | 2-6,1-6 |
| ITF W60 Hechingen | 2019/08/10 14:30 | Haas, Barbara v Lea Boskovic | 4-6,7-6,6-3 |
| ITF W60 Hechingen | 2019/08/09 15:00 | Schaeder, Laura v Haas, Barbara | 2-6,1-6 |
| ITF W60 Hechingen | 2019/08/08 15:00 | Jule Niemeier v Haas, Barbara | 1-6,3-6 |
| ITF W60 Hechingen | 2019/08/08 10:00 | Alexandra Vecic v Haas, Barbara | 3-6,4-6 |
| ITF W25 Prague | 2019/08/28 09:50 | Gervais, Julie v Piter, Katarzyna | 4-6,5-7 |
| ITF W25 Braunschweig | 2019/08/22 13:30 | Cagla Buyukakcay v Piter, Katarzyna | 4-6,6-4,6-3 |
| ITF W25 Braunschweig | 2019/08/21 15:00 | Koelzer, Romy v Piter, Katarzyna | 4-6,6-4,6-7 |
| Varsovie, Simples W-ITF-POL-02A | 2019/08/08 10:00 | Piter, Katarzyna v Yue Yuan | 5-7,3-6 |
| Varsovie, Simples W-ITF-POL-02A | 2019/08/07 08:00 | Piter, Katarzyna v Chernyshova, Maryna | 6-3,6-4 |
| Grodzisk Mazowiecki, Singles W-ITF-POL-04A | 2019/08/03 12:30 | Maja Chwalinska v Piter, Katarzyna | 6-2,6-2 |
| Grodzisk Mazowiecki, Singles W-ITF-POL-04A | 2019/08/02 13:40 | Piter, Katarzyna v Ulrikke Eikeri | 6-3,7-6 |
| Grodzisk Mazowiecki, Singles W-ITF-POL-04A | 2019/08/01 13:40 | Piter, Katarzyna v Viktoriia Dema | 6-2,6-1 |