Stadium: Centre Court Darmstadt Round: 28
| ITF Women Darmstadt | 2018/07/20 11:00 | Koelzer, Romy v Nina Potocnik | 6-1,6-2 |
| ITF Women Darmstadt | 2018/07/19 10:00 | Koelzer, Romy v Kennel, Karin | 6-2,6-2 |
| ITF Women Darmstadt | 2018/07/18 10:00 | Stokke, Melanie v Koelzer, Romy | 2-6,2-6 |
| ITF Women Darmstadt Qual | 2018/07/16 15:30 | Cheong, Naomi v Koelzer, Romy | 2-6,2-6 |
| ITF Women Darmstadt Qual | 2018/07/16 10:00 | Hering, Katharina v Koelzer, Romy | 3-6,7-5,3-6 |
| ITF Women Getxo | 2018/07/13 09:00 | Gonzalez, Montserrat v Koelzer, Romy | 6-2,6-2 |
| ITF Women Getxo | 2018/07/11 10:00 | Koelzer, Romy v Marina Bassols Ribera | 6-4,6-3 |
| ITF Women Getxo | 2018/07/09 09:20 | Koelzer, Romy v Daria Lodikova | 6-3,6-1 |
| ITF Women Darmstadt | 2018/07/20 15:30 | Gerlach, Katharina v Melanie Klaffner | 7-5,6-1 |
| ITF Women Darmstadt | 2018/07/19 11:00 | Isabella Shinikova v Gerlach, Katharina | 7-6,2-6,4-6 |
| ITF Women Darmstadt | 2018/07/18 13:00 | Schech, Ruxandra v Gerlach, Katharina | 1-6,3-6 |
| ITF Women Versmold | 2018/07/11 15:00 | Gerlach, Katharina v Cagla Buyukakcay | 6-2,4-6,5-7 |
| ITF Women Aschaffenburg | 2018/07/04 13:00 | Gerlach, Katharina v Halbauer, Elizabeth | 4-6,6-1,1-6 |
| ITF Women Stuttgart | 2018/06/27 11:00 | Panova, Alexandra v Gerlach, Katharina | 7-5,6-4 |
| ITF Women Kaltenkirchen | 2018/06/20 09:00 | Gerlach, Katharina v Wargnier, Lucie | 2-6,6-0,4-6 |
| ITF Women Essen | 2018/06/12 10:30 | Ekaterine Gorgodze v Gerlach, Katharina | 6-0,1-6,6-1 |