| Jackson, Singles W-ITF-USA-09A | 04/04 18:00 | 26 | [304] Piter, Katarzyna v Katie Volynets [431] | 3-6,1-6 | |
| Jackson, Singles W-ITF-USA-09A | 04/03 15:00 | 25 | Piter, Katarzyna v Dia Evtimova | 6-4,6-0 | |
| ITF W25 Macon | 02/25 14:35 | 45 | [297] Piter, Katarzyna v Xinyu Wang [300] | 1-6,6-4,10-12 | |
| ITF W25 Macon | 02/25 08:30 | 45 | Piter, Katarzyna v Fayard, Juline | 6-1,6-1 | |
| ITF W25 Altenkirchen | 02/20 12:20 | 25 | [201] Ivakhnenko, Valentyna v Piter, Katarzyna [297] | 6-1,4-6,6-4 | |
| ITF Women Pune | 12/12 08:10 | 26 | [301] Piter, Katarzyna v Chieh-Yu Hsu [250] | 3-6,3-6 | |
| ITF Women Pune | 12/10 04:30 | 25 | [301] Piter, Katarzyna v Ho, Jessica [376] | 6-0,6-3 | |
| ITF Women Solapur | 12/06 06:50 | 27 | [251] Lemoine, Quirine v Piter, Katarzyna [301] | 7-5,6-3 | |
| ITF Women Solapur | 12/05 05:20 | 26 | [301] Piter, Katarzyna v Chieh-Yu Hsu [250] | 6-4,6-3 | |
| ITF Women Solapur | 12/04 07:10 | 25 | [301] Piter, Katarzyna v Namigata, Junri [287] | 6-2,6-7,6-4 | |
| ITF Women Pune | 11/27 08:15 | 25 | [227] Jia-Jing Lu v Piter, Katarzyna [301] | 6-1,2-6,6-4 | |
| ITF Women Minsk | 11/09 08:00 | 28 | [361] Hatouka, Yuliya v Piter, Katarzyna [297] | 6-1,2-6,6-2 | |
| ITF Women Minsk | 11/08 08:55 | 27 | [358] Berfu Cengiz v Piter, Katarzyna [297] | 0-6,6-4,3-6 | |
| ITF Women Minsk | 11/07 11:25 | 26 | [500] Pirazhenka, Sviatlana v Piter, Katarzyna [297] | 3-6,6-7 | |
| ITF Women Minsk | 11/06 10:40 | 25 | [341] Polina Leykina v Piter, Katarzyna [297] | 3-6,2-6 | |
| ITF Women Petange | 10/31 16:00 | 26 | [111] Minella, Mandy v Piter, Katarzyna [303] | 3-6,6-3,6-4 | |
| ITF Women Petange | 10/30 13:00 | 25 | [417] Detiuc, Anastasia v Piter, Katarzyna [303] | 2-6,2-6 | |
| ITF Women Oslo | 10/25 08:00 | 27 | [148] Badosa, Paula v Piter, Katarzyna [296] | 6-3,6-3 | |
| ITF Women Oslo | 10/24 08:00 | 26 | [118] Lister, Cornelia v Piter, Katarzyna [296] | 7-5,3-6,2-6 | |
| ITF Women Oslo | 10/23 08:00 | 25 | [350] Gerlach, Katharina v Piter, Katarzyna [296] | 4-6,2-6 | |
| WTA Luxembourg | 10/13 21:10 | 45 | [293] Piter, Katarzyna v Arantxa Rus [112] | 1-6,3-6 | |
| ITF Women Cherbourg | 10/10 09:00 | 26 | [293] Piter, Katarzyna v Cagla Buyukakcay [257] | 7-5,3-6,5-7 | |
| ITF Women Cherbourg | 10/09 07:30 | 25 | Piter, Katarzyna v Fayol, Clemence | 6-4,6-2 | |
| Obidos, Singles W-WITF-POR-12A | 10/02 10:00 | 25 | [464] Mirjam Bjorklund v Piter, Katarzyna [305] | 6-1,7-6 | |
| Obidos, Singles W-WITF-POR-12A | 09/28 09:30 | 27 | [400] Greet Minnen v Piter, Katarzyna [313] | 6-3,6-3 | |
| Obidos, Singles W-WITF-POR-12A | 09/27 11:15 | 26 | [377] Kostic, Natalija v Piter, Katarzyna [313] | 1-6,1-6 | |
| Obidos, Singles W-WITF-POR-12A | 09/25 11:30 | 25 | Vrljic, Ana v Piter, Katarzyna | 4-6,4-6 | |
| ITF Women Dobrich | 09/21 09:00 | 27 | [463] Irina Fetecau v Piter, Katarzyna [322] | 6-4,6-4 | |
| ITF Women Dobrich | 09/20 07:00 | 26 | [336] Marfutina, Maria v Piter, Katarzyna [322] | 6-2,3-6,5-7 | |
| ITF Women Dobrich | 09/19 07:00 | 25 | [413] Irene B Escorihuela v Piter, Katarzyna [322] | 5-7,3-6 |