Stadium: Center Court Round: 29
| ITF Women Horb | 2018/07/28 13:30 | Jaqueline Adina Cristian v Katarzyna Piter | 4-6,2-6 |
| ITF Women Horb | 2018/07/27 15:00 | Katharina Hobgarski v Katarzyna Piter | 0-6,6-4,4-6 |
| ITF Women Horb | 2018/07/26 15:30 | Carmen Schultheiss v Katarzyna Piter | 1-6,6-7 |
| ITF Women Horb | 2018/07/25 10:00 | Katarzyna Piter v Valeriya Strakhova | 7-5,6-3 |
| WTA Gstaad Qual | 2018/07/14 12:45 | Martina Trevisan v Katarzyna Piter | 4-6,7-6,6-3 |
| ITF Women Versmold | 2018/07/12 12:00 | Bibiane Schoofs v Katarzyna Piter | 7-5,6-2 |
| ITF Women Versmold | 2018/07/12 07:30 | Katarzyna Piter v Chiara Scholl | 6-3,6-1 |
| ITF Women Versmold Qual | 2018/07/10 11:00 | Miriam Kolodziejova v Katarzyna Piter | 6-7,4-6 |
| ITF Women Horb | 2018/07/28 11:30 | Polina Leykina v Katharina Gerlach | 1-6,4-6 |
| ITF Women Horb | 2018/07/27 12:30 | Katharina Gerlach v Chiara Scholl | 6-1,6-2 |
| ITF Women Horb | 2018/07/26 15:45 | Federica Di Sarra v Katharina Gerlach | 1-6,1-6 |
| ITF Women Horb | 2018/07/25 17:15 | Katharina Gerlach v Vivien Juhaszova | 6-4,6-7,6-2 |
| ITF Women Darmstadt | 2018/07/22 11:00 | Aliona Bolsova Zadoinov v Katharina Gerlach | 6-2,6-1 |
| ITF Women Darmstadt | 2018/07/21 12:00 | Romy Koelzer v Katharina Gerlach | 5-7,3-6 |
| ITF Women Darmstadt | 2018/07/20 15:30 | Katharina Gerlach v Melanie Klaffner | 7-5,6-1 |
| ITF Women Darmstadt | 2018/07/19 11:00 | Isabella Shinikova v Katharina Gerlach | 7-6,2-6,4-6 |