Round: 26 Ground: Hardcourt outdoor
| ITF W25 Jackson | 2019/04/03 15:00 | Katarzyna Piter v Dia Evtimova | 6-4,6-0 |
| ITF W25 Macon | 2019/02/25 14:35 | Katarzyna Piter v Xinyu Wang | 1-6,6-4,10-12 |
| ITF W25 Macon | 2019/02/25 08:30 | Katarzyna Piter v Juline Fayard | 6-1,6-1 |
| ITF W25 Altenkirchen | 2019/02/20 12:20 | Valentyna Ivakhnenko v Katarzyna Piter | 6-1,4-6,6-4 |
| ITF Women Pune | 2018/12/12 08:10 | Katarzyna Piter v Chieh-Yu Hsu | 3-6,3-6 |
| ITF Women Pune | 2018/12/10 04:30 | Katarzyna Piter v Jessica Ho | 6-0,6-3 |
| ITF Women Solapur | 2018/12/06 06:50 | Quirine Lemoine v Katarzyna Piter | 7-5,6-3 |
| ITF Women Solapur | 2018/12/05 05:20 | Katarzyna Piter v Chieh-Yu Hsu | 6-4,6-3 |
| ITF W25 Jackson | 2019/04/03 15:00 | Katie Volynets v Montserrat Gonzalez | 6-1,6-2 |
| WTA Indian Wells | 2019/02/25 18:00 | Katie Volynets v Jennifer Brady | 3-6,3-6 |
| ITF W25 Rancho Santa Fe | 2019/02/22 18:00 | Katie Volynets v Kristie Ahn | 0-6,6-2,7-10 |
| ITF W25 Rancho Santa Fe | 2019/02/19 20:05 | Sandra Samir v Katie Volynets | 2-6,6-2,3-6 |
| WTA Newport Beach | 2019/01/23 22:00 | Bianca Andreescu v Katie Volynets | 6-2,7-6 |
| WTA Newport Beach | 2019/01/22 18:00 | Mari Osaka v Katie Volynets | 0-6,0-6 |
| WTA Newport Beach | 2019/01/21 18:00 | Alexa Guarachi v Katie Volynets | 6-4,4-6,3-6 |
| ITF W25 Daytona Beach | 2019/01/16 16:15 | Ylena In-Albon v Katie Volynets | 6-4,6-1 |