Stadium: Show Court Round: 45
| Balatonboglar, Simples W-WITF-HUN-08A | 2018/05/02 10:55 | Kaja Juvan v Gerlach, Katharina | 6-2,6-1 |
| Balatonboglar, Simples W-WITF-HUN-08A | 2018/05/01 09:40 | Gerlach, Katharina v Dalma Galfi | 6-3,4-6,6-2 |
| WTA Stuttgart Qual | 2018/04/21 11:45 | Su-Wei Hsieh v Gerlach, Katharina | 2-6,7-5,6-2 |
| ITF Women Santa Margherita Qual | 2018/03/27 13:00 | Di Giuseppe, Martina v Gerlach, Katharina | 6-3,7-5 |
| ITF Women Santa Margherita Qual | 2018/03/21 10:30 | Tena Lukas v Gerlach, Katharina | 6-4,6-2 |
| ITF Women Santa Margherita Qual | 2018/03/19 13:00 | Vrljic, Ana v Gerlach, Katharina | 4-6,3-6 |
| ITF Women Santa Margherita Qual | 2018/03/13 13:00 | Manon Arcangioli v Gerlach, Katharina | 6-3,6-3 |
| Manacor (Mallorca), Singles Quali W-WITF-ESP-01A | 2018/03/02 09:00 | Ylena In-Albon v Gerlach, Katharina | 5-7,7-5,6-1 |
| Balatonboglar, Simples W-WITF-HUN-08A | 2018/05/04 09:45 | Kaja Juvan v Zaja, Anna | 6-3,6-1 |
| Balatonboglar, Simples W-WITF-HUN-08A | 2018/05/03 11:30 | Zaja, Anna v Remondina, Anna | 6-1,7-6 |
| Balatonboglar, Simples W-WITF-HUN-08A | 2018/05/02 09:00 | Zaja, Anna v Amina Anshba | 7-5,6-1 |
| Balatonboglar, Simples W-WITF-HUN-08A | 2018/05/01 14:00 | Zaja, Anna v Veronika Erjavec | 6-7,7-6,6-2 |
| WTA Stuttgart Qual | 2018/04/22 13:50 | Witthoeft, Carina v Zaja, Anna | 2-6,6-0,6-3 |
| WTA Stuttgart Qual | 2018/04/21 17:50 | Zaja, Anna v Katharina Hobgarski | 6-4,6-4 |
| Santa Margherita Di Pula, Simples W-WITF-ITA-27A | 2018/04/12 16:45 | Tamara Zidansek v Zaja, Anna | 6-4,7-5 |
| Santa Margherita Di Pula, Simples W-WITF-ITA-27A | 2018/04/10 15:00 | Marie Benoit v Zaja, Anna | 3-6,4-6 |