| ITF W25 Roehampton | 09/24 08:30 | 25 | [282] Jana Fett v Katarzyna Piter [351] | 6-4,6-2 | |
| ITF W25 Prague | 09/05 10:55 | 26 | Gabriela Horackova v Katarzyna Piter | 6-3,4-6,7-5 | |
| ITF W25 Prague | 09/04 12:50 | 25 | Sina Herrmann v Katarzyna Piter | 4-6,1-6 | |
| ITF W25 Prague | 08/30 09:00 | 27 | [146] Barbara Haas v Katarzyna Piter [348] | 6-2,5-7,6-4 | |
| ITF W25 Prague | 08/29 09:00 | 26 | Katarzyna Piter v Maryna Zanevska | Walkover | |
| ITF W25 Prague | 08/28 09:50 | 25 | [407] Julie Gervais v Katarzyna Piter [348] | 4-6,5-7 | |
| ITF W25 Braunschweig | 08/22 13:30 | 26 | [262] Cagla Buyukakcay v Katarzyna Piter [348] | 4-6,6-4,6-3 | |
| ITF W25 Braunschweig | 08/21 15:00 | 25 | Romy Koelzer v Katarzyna Piter | 4-6,6-4,6-7 | |
| ITF W60 Warsaw | 08/08 10:00 | 26 | [365] Katarzyna Piter v Yue Yuan [272] | 5-7,3-6 | |
| ITF W60 Warsaw | 08/07 08:00 | 25 | [365] Katarzyna Piter v Maryna Chernyshova [396] | 6-3,6-4 | |
| ITF W25 Grodzisk Mazowiecki | 08/03 12:30 | 28 | [335] Maja Chwalinska v Katarzyna Piter [337] | 6-2,6-2 | |
| ITF W25 Grodzisk Mazowiecki | 08/02 13:40 | 27 | [337] Katarzyna Piter v Ulrikke Eikeri [229] | 6-3,7-6 | |
| ITF W25 Grodzisk Mazowiecki | 08/01 13:40 | 26 | Katarzyna Piter v Viktoriia Dema | 6-2,6-1 | |
| ITF W25 Grodzisk Mazowiecki | 07/31 11:30 | 25 | Katarzyna Piter v Timea Jaruskova | 6-1,6-4 | |
| ITF W25 Bytom | 07/27 10:00 | 28 | [421] Nina Potocnik v Katarzyna Piter [334] | 5-7,6-4,6-1 | |
| ITF W25 Bytom | 07/26 11:00 | 27 | [304] Ipek Soylu v Katarzyna Piter [334] | 5-7,6-1,4-6 | |
| ITF W25 Bytom | 07/25 12:30 | 26 | Karolina Kubanova v Katarzyna Piter | 1-6,1-6 | |
| ITF W25 Bytom | 07/24 08:00 | 25 | Marcelina Podlinska v Katarzyna Piter | 1-6,1-6 | |
| ITF W25 Den Haag | 07/03 15:10 | 25 | [322] Katarzyna Piter v Cagla Buyukakcay [246] | 5-7,6-4,2-6 | |
| ITF W25 Darmstadt | 06/27 10:00 | 26 | [260] Olga Govortsova v Katarzyna Piter [320] | 6-0,6-2 | |
| ITF W25 Darmstadt | 06/25 16:00 | 25 | [418] Romy Koelzer v Katarzyna Piter [320] | 5-7,6-2,2-6 | |
| ITF W25 Prerov | 06/13 10:20 | 26 | [486] Miriam B Bulgaru v Katarzyna Piter [309] | 7-5,6-3 | |
| ITF W25 Prerov | 06/12 12:40 | 25 | Veronika Vlkovska v Katarzyna Piter | 6-4,1-6,4-6 | |
| WTA Strasbourg | 05/18 09:15 | 45 | [294] Katarzyna Piter v Renata Zarazua [267] | 5-7,1-6 | |
| ITF W25 Osprey | 04/25 17:00 | 26 | [294] Katarzyna Piter v Usue Maitane Arconada [319] | 2-6,4-6 | |
| ITF W25 Osprey | 04/23 18:10 | 25 | [294] Katarzyna Piter v Zuzana Zlochova [339] | 6-3,6-1 | |
| ITF W80 Dothan | 04/16 17:25 | 45 | [279] Kristina Kucova v Katarzyna Piter [300] | 6-2,6-0 | |
| ITF W80 Dothan | 04/15 19:40 | 45 | Emerald Able v Katarzyna Piter | 1-6,1-6 | |
| ITF W25 Pelham | 04/11 15:00 | 26 | [304] Katarzyna Piter v Caroline Dolehide [180] | 3-6,1-6 | |
| ITF W25 Pelham | 04/10 16:00 | 25 | [304] Katarzyna Piter v Victoria Rodriguez [295] | 6-0,6-3 |