| Sofia, Singles W-WITF-BUL-01A | 09/06 09:00 | 26 | Piter, Katarzyna v Ianchuk, Olga | 4-6,6-3,6-7 | |
| Sofia, Singles W-WITF-BUL-01A | 09/05 08:55 | 25 | [413] Sanesi, Gaia v Piter, Katarzyna [330] | 4-6,3-6 | |
| ITF Women Bagnatica | 08/27 09:00 | 54 | Piter, Katarzyna v Scala, Camilla | 4-6,4-6 | |
| ITF Women Bagnatica | 08/26 14:00 | - | Piter, Katarzyna v Scala, Camilla | 4-6,4-5 | |
| ITF Women Bagnatica | 08/25 12:45 | 54 | [328] Piter, Katarzyna v Ho, Jessica [453] | 6-1,6-1 | |
| ITF Women Braunschweig | 08/22 11:15 | 25 | [198] Jorovic, Ivana v Piter, Katarzyna [328] | 3-6,6-2,6-4 | |
| ITF Women Leipzig | 08/12 11:00 | 44 | Piter, Katarzyna v Stephanie Wagner | 5-7,6-0,4-6 | |
| ITF Women Hechingen Qual | 08/06 10:00 | 54 | Jule Niemeier v Piter, Katarzyna | 6-3,6-3 | |
| ITF Women Hechingen Qual | 08/05 09:00 | 54 | Palkina, Ksenia v Piter, Katarzyna | 0-6,1-6 | |
| ITF Women Horb | 07/29 13:00 | 29 | [367] Piter, Katarzyna v Gerlach, Katharina [290] | 6-4,3-6,6-7 | |
| ITF Women Horb | 07/28 13:30 | 28 | [229] Cristian, Jaqueline Adina v Piter, Katarzyna [367] | 4-6,2-6 | |
| ITF Women Horb | 07/27 15:00 | 27 | [266] Katharina Hobgarski v Piter, Katarzyna [367] | 0-6,6-4,4-6 | |
| ITF Women Horb | 07/26 15:30 | 26 | Schultheiss, Carmen v Piter, Katarzyna | 1-6,6-7 | |
| ITF Women Horb | 07/25 10:00 | 25 | [367] Piter, Katarzyna v Valeriya Strakhova [300] | 7-5,6-3 | |
| WTA Gstaad Qual | 07/14 12:45 | 45 | [190] Martina Trevisan v Piter, Katarzyna [386] | 4-6,7-6,6-3 | |
| ITF Women Versmold | 07/12 12:00 | 26 | [173] Bibiane Schoofs v Piter, Katarzyna [386] | 7-5,6-2 | |
| ITF Women Versmold | 07/12 07:30 | 25 | [386] Piter, Katarzyna v Chiara Scholl [227] | 6-3,6-1 | |
| ITF Women Versmold Qual | 07/10 11:00 | 54 | [256] Kolodziejova, Miriam v Piter, Katarzyna [386] | 6-7,4-6 | |
| ITF Women Versmold Qual | 07/09 11:00 | 54 | [427] Uzcategui, Aymet v Piter, Katarzyna [386] | 4-6,2-6 | |
| ITF Women Versmold Qual | 07/08 10:30 | 54 | [491] Krejsova, Petra v Piter, Katarzyna [386] | 2-6,2-6 | |
| ITF Women Torun | 06/26 16:05 | 25 | [356] Piter, Katarzyna v Marina Melnikova [257] | 6-4,5-7,3-6 | |
| s-Hertogenbosch, Netherlands, Qualifying | 06/10 09:00 | 64 | [174] Valentini Grammatikopoulou v Piter, Katarzyna [371] | 6-4,6-4 | |
| s-Hertogenbosch, Netherlands, Qualifying | 06/09 09:50 | 45 | [371] Piter, Katarzyna v Haas, Barbara [190] | 6-3,6-4 | |
| ITF Women Brescia | 06/06 09:30 | 25 | [188] Di Lorenzo, Francesca v Piter, Katarzyna [371] | 7-5,6-1 | |
| ITF Women Brescia Qual | 06/05 08:30 | 54 | [371] Piter, Katarzyna v Alves, Carolina [482] | 6-3,6-1 | |
| ITF Women Brescia Qual | 06/04 10:20 | 54 | [371] Piter, Katarzyna v Gabriela Ce [221] | 6-1,6-1 | |
| ITF Women Brescia Qual | 06/03 12:25 | 54 | Piter, Katarzyna v Zmau, Michele Alexandra | 6-1,6-4 | |
| ITF Women Grado Qual | 05/26 13:00 | 54 | Piter, Katarzyna v Maria Camila Osorio Serrano | 4-6,2-6 | |
| WTA Strasbourg | 05/20 13:40 | 25 | [54] Zarina Diyas v Piter, Katarzyna [382] | 6-2,6-4 | |
| WTA Strasbourg Qual | 05/19 11:00 | 64 | [382] Piter, Katarzyna v Jaqueline Cristian [222] | 6-3,6-2 |