| ITF W60 Versmold | 07/10 12:00 | 25 | [319] Gerlach, Katharina v Kostova, Elitsa [220] | 3-6,5-7 | |
| ITF W25 Stuttgart | 07/02 16:30 | 25 | [319] Gerlach, Katharina v Caroline Werner [409] | 0-6,3-6 | |
| ITF W25 Darmstadt | 06/25 15:45 | 25 | [260] Govortsova, Olga v Gerlach, Katharina [315] | 6-1,6-1 | |
| ITF W25 Klosters | 06/19 07:00 | 25 | Gerlach, Katharina v Zuger, Joanne | 4-6,2-6 | |
| Nuremberg, Germany | 05/19 10:15 | 64 | [211] Cepelova, Jana v Gerlach, Katharina [331] | 3-6,6-4,6-4 | |
| Nuremberg, Germany | 05/18 12:35 | 45 | [331] Gerlach, Katharina v Pemra Ozgen [252] | 6-3,6-0 | |
| Wiesbaden, Simples W-ITF-GER-03A | 05/01 12:10 | 25 | [325] Gerlach, Katharina v Zaja, Anna [188] | 4-6,6-3,0-6 | |
| Tunis, Singles W-ITF-TUN-21A | 04/11 11:50 | 26 | [469] Lara Salden v Gerlach, Katharina [330] | 6-2,7-5 | |
| Tunis, Singles W-ITF-TUN-21A | 04/10 12:00 | 25 | [424] Caregaro, Martina v Gerlach, Katharina [330] | 7-5,1-6,3-6 | |
| ITF W25 Canberra | 03/27 04:50 | 25 | [405] Fernandez, Leylah Annie v Gerlach, Katharina [335] | 6-3,3-6,6-4 | |
| ITF W25 Canberra | 03/22 01:15 | 27 | [335] Gerlach, Katharina v Destanee Aiava [202] | 2-6,6-4,1-6 | |
| ITF W25 Canberra | 03/21 01:20 | 26 | [258] Cagla Buyukakcay v Gerlach, Katharina [335] | 6-7,3-6 | |
| ITF W25 Canberra | 03/20 02:15 | 25 | [335] Gerlach, Katharina v Olivia Tjandramulia [383] | 6-3,6-2 | |
| Mildura, Simples W-ITF-AUS-06A | 03/08 02:20 | 27 | Lulu Sun v Gerlach, Katharina | 6-2,6-0 | |
| Mildura, Simples W-ITF-AUS-06A | 03/06 23:00 | 26 | Alana Parnaby v Gerlach, Katharina | 2-6,6-7 | |
| Mildura, Simples W-ITF-AUS-06A | 03/05 02:40 | 25 | [353] Gerlach, Katharina v Hiroko Kuwata [266] | 6-3,3-6,6-3 | |
| ITF W25 Altenkirchen | 02/18 18:45 | 45 | [349] Gerlach, Katharina v Stephanie Wagner [490] | 6-3,3-6,5-10 | |
| ITF W25 Altenkirchen | 02/18 13:55 | 45 | [349] Gerlach, Katharina v Emily Webley-Smith [494] | 6-2,6-4 | |
| Shrewsbury, Simples W-ITF-GBR-02A | 02/11 10:00 | 45 | [242] Zimmermann, Kimberley v Gerlach, Katharina [345] | 6-3,6-3 | |
| Midland, Simples W-ITF-USA-03A | 01/28 15:00 | 45 | [375] Gleason, Quinn v Gerlach, Katharina [342] | 2-6,6-2,10-7 | |
| Newport Beach, USA | 01/21 20:20 | 24 | [308] Harmony Tan v Gerlach, Katharina [333] | 6-4,6-2 | |
| ITF Women Pune | 11/28 06:55 | 26 | [291] Valeriya Strakhova v Gerlach, Katharina [349] | 7-6,7-5 | |
| ITF Women Pune | 11/26 04:30 | 25 | Gerlach, Katharina v Riya Bhatia | 6-0,6-3 | |
| ITF Women Pune | 11/25 07:25 | 54 | [350] Gerlach, Katharina v Eden Silva [474] | 6-2,6-2 | |
| ITF Women Pune | 11/24 06:15 | 54 | [350] Gerlach, Katharina v Melanie Klaffner [445] | 6-2,7-5 | |
| ITF Women Shrewsbury | 11/06 14:15 | 25 | [355] Gerlach, Katharina v Zaja, Anna [222] | 4-6,4-6 | |
| ITF Women Wirral | 10/30 13:15 | 25 | [310] Greet Minnen v Gerlach, Katharina [350] | 6-3,6-3 | |
| ITF Women Oslo | 10/23 08:00 | 25 | [350] Gerlach, Katharina v Piter, Katarzyna [296] | 4-6,2-6 | |
| WTA Luxembourg | 10/13 14:20 | 45 | [336] Gerlach, Katharina v Greet Minnen [349] | 7-5,3-6,1-6 | |
| Santa Margherita Di Pula, Simples W-WITF-ITA-27A | 09/19 12:00 | 25 | [242] Anastasia Grymalska v Gerlach, Katharina [336] | 6-4,6-4 |