Stadium: Court 2 Round: 27 Ground: Clay
| ITF Women Daytona Beach | 2018/01/11 16:00 | Gerlach, Katharina v Perper, Alexandra | 6-4,1-6,4-6 |
| Manacor (Mallorca), Singles Quali W-WITF-ESP-01A | 2018/02/28 08:30 | Gerlach, Katharina v Hosonuma, Chisa | 6-3,6-4 |
| Manacor (Mallorca), Singles Quali W-WITF-ESP-01A | 2018/02/27 09:30 | Gerlach, Katharina v Rosca, Ioana Loredana | 6-4,4-6,6-2 |
| Altenkirchen, Qualifications Simples W-WITF-GER-02A | 2018/02/19 13:15 | Jesika Maleckova v Gerlach, Katharina | 6-3,6-0 |
| Altenkirchen, Qualifications Simples W-WITF-GER-02A | 2018/02/18 09:00 | Gerlach, Katharina v Kolodziejova, Miriam | 4-6,6-3,6-4 |
| Altenkirchen, Qualifications Simples W-WITF-GER-02A | 2018/02/17 09:30 | Gerlach, Katharina v Cristina Bucsa | 7-6,3-6,6-2 |
| Manacor (Mallorca), Singles Quali W-WITF-ESP-01A | 2018/02/11 09:00 | Marina Bassols Ribera v Gerlach, Katharina | 6-2,6-1 |
| Manacor (Mallorca), Singles Quali W-WITF-ESP-01A | 2018/02/10 18:00 | Marina Bassols Ribera v Gerlach, Katharina | 6-2,5-1 |
| Manacor (Mallorca), Singles Quali W-WITF-ESP-01A | 2018/02/09 10:15 | Rosa Vicens Mas v Gerlach, Katharina | 6-3,3-6,1-6 |
| Manacor (Mallorca), Singles Quali W-WITF-ESP-01A | 2018/02/28 09:55 | Paula Arias Manjon v Perper, Alexandra | 2-6,7-6,6-7 |
| Manacor (Mallorca), Singles Quali W-WITF-ESP-01A | 2018/02/27 08:00 | Claudia Hoste Ferrer v Perper, Alexandra | 6-3,3-6,2-6 |
| Manacor (Mallorca), Singles Quali W-WITF-ESP-01A | 2018/02/24 09:00 | Marina Bassols Ribera v Perper, Alexandra | 6-1,3-6,7-5 |
| Manacor (Mallorca), Singles Quali W-WITF-ESP-01A | 2018/02/23 13:45 | Perper, Alexandra v Isabella Shinikova | 6-1,6-4 |
| Manacor (Mallorca), Singles Quali W-WITF-ESP-01A | 2018/02/23 09:40 | Perper, Alexandra v Yukina Saigo | 6-3,6-1 |
| Manacor (Mallorca), Singles Quali W-WITF-ESP-01A | 2018/02/20 11:20 | Perper, Alexandra v Claudia Hoste Ferrer | 6-4,5-7,6-1 |
| Manacor (Mallorca), Singles Quali W-WITF-ESP-01A | 2018/02/17 09:00 | Naho Sato v Perper, Alexandra | 1-6,5-7 |
| Manacor (Mallorca), Singles Quali W-WITF-ESP-01A | 2018/02/16 13:00 | Perper, Alexandra v Irene Burillo Escorihuela | 6-4,3-6,6-2 |