| ITF Women Poitiers Qual | 10/22 14:35 | 54 | [311] Katarzyna Piter v Karolina Muchova [242] | 6-3,6-4 | |
| ITF Women Poitiers Qual | 10/21 11:40 | 54 | Tess Sugnaux v Katarzyna Piter | 5-7,6-2,2-6 | |
| ITF Women Joue-Les-Tours | 10/18 10:45 | 26 | [311] Katarzyna Piter v Katarina Zavatska [255] | 6-4,6-7,2-6 | |
| ITF Women Joue-Les-Tours | 10/16 09:00 | 25 | [297] Emily Webley-Smith v Katarzyna Piter [311] | 7-6,5-7,3-6 | |
| ITF Women Saint Malo | 09/19 10:20 | 25 | [277] Katarzyna Piter v Isabelle Wallace [282] | 2-6,6-2,2-6 | |
| ITF Women Sofia | 09/06 07:00 | 25 | [435] Oana Georgeta Simion v Katarzyna Piter [239] | 3-6,7-5,7-6 | |
| US Open Women Qual | 08/22 23:25 | 44 | [233] Katarzyna Piter v Grace Min [166] | 1-6,6-3,3-6 | |
| ITF Women Hechingen | 08/08 11:50 | 25 | [231] Katarzyna Piter v Anna Kalinskaya [152] | 2-6,6-3,3-6 | |
| ITF Women Prague | 07/26 14:00 | 25 | [100] Denisa Allertova v Katarzyna Piter [224] | 7-6,6-4 | |
| WTA Bucharest Qual | 07/15 11:50 | 45 | [268] Varatchaya Wongteanchai v Katarzyna Piter [218] | 1-6,7-5,6-3 | |
| ITF Women Torino | 07/11 08:00 | 25 | [218] Katarzyna Piter v Anastasia Grymalska [366] | 1-6,4-6 | |
| ITF Women Rome | 07/04 09:40 | 25 | [312] Elena Gabriela Ruse v Katarzyna Piter [218] | 6-2,6-4 | |
| ITF Women Rome | 07/04 09:00 | 25 | Jasmine Paolini v Katarzyna Piter | Cancelled | |
| ITF Women Warsaw | 06/24 14:25 | 28 | [222] Katarzyna Piter v Martina Trevisan [209] | 4-6,2-6 | |
| ITF Women Warsaw | 06/24 07:30 | 27 | Ani Mijacika v Katarzyna Piter | 3-6,3-6 | |
| ITF Women Warsaw | 06/22 11:50 | 26 | Valeriya Urzhumova v Katarzyna Piter | 3-6,2-6 | |
| ITF Women Warsaw | 06/21 10:50 | 25 | [430] Lou Brouleau v Katarzyna Piter [222] | 1-6,0-6 | |
| ITF Women Padova | 06/15 09:00 | 26 | [386] Martina Caregaro v Katarzyna Piter [217] | 6-2,6-4 | |
| ITF Women Padova | 06/13 09:00 | 25 | [306] Bibiane Schoofs v Katarzyna Piter [217] | 4-6,6-7 | |
| WTA Strasbourg Qual | 05/20 10:45 | - | [85] Julia Boserup v Katarzyna Piter [224] | 6-2,6-1 | |
| WTA Strasbourg Qual | 05/19 15:10 | 25 | [270] Shuko Aoyama v Katarzyna Piter [224] | 2-6,7-6,5-7 | |
| WTA Prague Qual | 04/29 13:10 | 45 | Natalia Vikhlyantseva v Katarzyna Piter | 6-1,6-0 | |
| WTA Stuttgart Qual | 04/22 20:25 | 45 | [60] Oceane Dodin v Katarzyna Piter [211] | 6-3,6-4 | |
| ITF Women Santa Margherita | 04/18 18:00 | 25 | [391] Giulia Gatto Monticone v Katarzyna Piter [211] | 6-4,6-1 | |
| ITF Women Santa Margherita | 04/11 12:30 | 25 | [452] Marie Benoit v Katarzyna Piter [213] | 7-5,2-6,7-6 | |
| ITF Women Santa Margherita | 04/06 11:10 | 26 | [213] Katarzyna Piter v Karolina Muchova [259] | 3-6,4-6 | |
| ITF Women Santa Margherita | 04/05 09:00 | 25 | [213] Katarzyna Piter v Alice Matteucci [481] | 6-1,5-7,6-1 | |
| ITF Women Shenzhen Qual | 03/12 04:25 | 54 | [231] Martina Trevisan v Katarzyna Piter [215] | 2-6,7-6,6-0 | |
| ITF Women Zhuhai Qual | 03/05 03:50 | 54 | Na-Lae Han v Katarzyna Piter | 6-2,6-1 | |
| ITF Women Altenkirchen | 02/15 12:00 | 25 | Katarzyna Piter v Quirine Lemoine | 1-6,3-6 |