Stadium: Center Court Round: 54
| ITF Women Hammamet | 2017/04/13 08:30 | Januskova, Petra v Gerlach, Katharina | 1-6,3-6 |
| ITF Women Hechingen Qual | 2018/08/05 11:40 | Emily Seibold v Januskova, Petra | 0-6,5-7 |
| ITF Women Vienna | 2018/07/18 10:00 | Jablonovska, Jana v Januskova, Petra | 6-2,6-2 |
| ITF Women Vienna | 2018/07/17 11:40 | Januskova, Petra v Kommer, Franziska | 6-1,6-0 |
| Matchs amicaux U18 | 2018/07/13 10:00 | Januskova, Petra v Jarlskog, Ida | 2-6,2-6 |
| Matchs amicaux U18 | 2018/07/11 11:00 | Januskova, Petra v Diana Chehoudi | 6-1,6-4 |
| ITF Women Hammamet | 2018/06/20 09:00 | Januskova, Petra v Julia Stamatova | 6-7,2-6 |
| ITF Women Hammamet | 2018/06/12 11:20 | Januskova, Petra v Merel Hoedt | 6-2,6-7,2-6 |
| ITF Women Hammamet | 2018/06/07 11:30 | Kordolaimi, Eleni v Januskova, Petra | 6-4,6-2 |
| ITF Women Hechingen Qual | 2018/08/05 13:30 | Pantuckova, Gabriela v Gerlach, Katharina | 0-6,2-6 |
| ITF Women Bad Saulgau | 2018/08/03 16:00 | Gerlach, Katharina v Laura Siegemund | 0-6,1-6 |
| ITF Women Bad Saulgau | 2018/08/02 12:35 | Scholsen, Helene v Gerlach, Katharina | 3-6,3-6 |
| ITF Women Bad Saulgau | 2018/08/01 15:20 | Kordolaimi, Eleni v Gerlach, Katharina | 2-6,4-6 |
| ITF Women Horb | 2018/07/29 13:00 | Piter, Katarzyna v Gerlach, Katharina | 6-4,3-6,6-7 |
| ITF Women Horb | 2018/07/28 11:30 | Polina Leykina v Gerlach, Katharina | 1-6,4-6 |
| ITF Women Horb | 2018/07/27 12:30 | Gerlach, Katharina v Chiara Scholl | 6-1,6-2 |
| ITF Women Horb | 2018/07/26 15:45 | Federica Di Sarra v Gerlach, Katharina | 1-6,1-6 |