| WTA - Stuttgart | 04/18 12:30 | 19 | [127] Voegele, Stefanie v Gerlach, Katharina [246] | 6-3,6-1 | |
| WTA - Stuttgart | 04/17 15:55 | 14 | [246] Gerlach, Katharina v Paar, Laura-Ioana [210] | 6-3,7-5 | |
| WTA Charleston Qual | 04/10 15:00 | 14 | [246] Gerlach, Katharina v Sanders, Storm [187] | 3-6,2-6 | |
| WTA - Bogota | 04/04 15:00 | 19 | [246] Gerlach, Katharina v Daniela Seguel [217] | 1-6,1-6 | |
| WTA - Bogota | 04/03 15:00 | 45 | [182] Clara Burel v Gerlach, Katharina [246] | 3-6,6-1,4-6 | |
| ITF W25 Buenos Aires | 03/26 12:00 | 26 | [246] Gerlach, Katharina v Alves, Carolina [371] | 4-6,1-6 | |
| ITF W25 Buenos Aires | 03/24 16:10 | 25 | [246] Gerlach, Katharina v Diana Marcinkevica [281] | 6-0,6-1 | |
| ITF W25 Altenkirchen | 02/18 13:10 | 26 | [164] Cristina Bucsa v Gerlach, Katharina [249] | 6-1,6-3 | |
| ITF W25 Altenkirchen | 02/17 09:30 | 25 | [225] Dalma Galfi v Gerlach, Katharina [249] | 6-7,3-6 | |
| ITF W25 Altenkirchen | 02/15 14:20 | 45 | [249] Gerlach, Katharina v Simona Waltert [301] | 1-6,0-6 | |
| ITF W25 Altenkirchen | 02/14 12:30 | 45 | Gerlach, Katharina v Shiho Akita | 6-0,5-7,10-8 | |
| ITF W60 Rome GA | 01/28 00:10 | 25 | [331] Irene Burillo Escorihuela v Gerlach, Katharina [248] | 3-6,6-2,6-1 | |
| ITF W25 Fujairah | 01/19 09:45 | 25 | [247] Gerlach, Katharina v Xinyu Wang [153] | 1-6,2-6 | |
| ITF W25 Fujairah | 01/18 07:35 | 54 | Gerlach, Katharina v Semenistaja, Marija | 6-0,6-0 | |
| Open d'Australie - Femmes | 01/12 13:25 | 15 | [245] Gerlach, Katharina v Hibi, Mayo [182] | 3-6,4-6 | |
| Open d'Australie - Femmes | 01/11 12:55 | 60 | [116] Voegele, Stefanie v Gerlach, Katharina [245] | 3-6,4-6 | |
| ITF W25 Selva Gardena | 12/15 16:00 | 25 | [260] Tena Lukas v Gerlach, Katharina [245] | 7-5,7-6 | |
| German Championship Women | 12/10 12:00 | - | Gerlach, Katharina v Mara Guth | 5-7,6-4,2-6 | |
| ITF W15 LPD Gran Canaria | 11/28 12:15 | 28 | [272] Andrea Lazaro Garcia v Gerlach, Katharina [245] | 6-3,6-2 | |
| ITF W15 LPD Gran Canaria | 11/27 10:10 | 27 | Oksana Selekhmeteva v Gerlach, Katharina | 6-4,0-6,3-6 | |
| ITF W15 LPD Gran Canaria | 11/26 12:40 | 26 | [391] Laura Pigossi v Gerlach, Katharina [245] | 4-6,3-6 | |
| ITF W15 LPD Gran Canaria | 11/25 13:15 | 25 | Lucia Cortez Llorca v Gerlach, Katharina | 2-6,2-6 | |
| ITF W25 LPD Gran Canaria | 11/17 15:30 | 25 | [245] Gerlach, Katharina v Hogenkamp, Richel [219] | 2-6,6-4,3-6 | |
| WTA - Linz | 11/07 10:15 | 45 | [116] Irina Bara v Gerlach, Katharina [243] | 2-6,6-3,6-4 | |
| ITF W25 Reims | 10/21 12:40 | 25 | [239] Harmony Tan v Gerlach, Katharina [244] | 6-0,6-0 | |
| ITF W25 Reims | 10/19 09:55 | 54 | [244] Gerlach, Katharina v Lumsden, Maia [348] | 7-5,6-3 | |
| ITF W25 Reims | 10/18 08:00 | 54 | Gerlach, Katharina v Le Bihan, Kelia | 6-1,6-4 | |
| ITF W25 Cherbourg | 10/11 17:40 | 54 | Gerlach, Katharina v Selena Janicijevic | 3-6,0-6 | |
| ITF W25 Grado | 09/16 16:15 | 25 | Sina Herrmann v Gerlach, Katharina | 6-3,6-4 | |
| ITF W25 Tarvisio | 09/10 14:05 | 25 | [321] Francesca Jones v Gerlach, Katharina [240] | 6-0,7-5 |