Stadium: Court 4 Round: 54 Ground: Hardcourt outdoor
| Open d'Australie - Femmes | 2021/01/12 13:25 | Gerlach, Katharina v Hibi, Mayo | 3-6,4-6 |
| Open d'Australie - Femmes | 2021/01/11 12:55 | Voegele, Stefanie v Gerlach, Katharina | 3-6,4-6 |
| ITF W25 Selva Gardena | 2020/12/15 16:00 | Tena Lukas v Gerlach, Katharina | 7-5,7-6 |
| German Championship Women | 2020/12/10 12:00 | Gerlach, Katharina v Mara Guth | 5-7,6-4,2-6 |
| ITF W15 LPD Gran Canaria | 2020/11/28 12:15 | Andrea Lazaro Garcia v Gerlach, Katharina | 6-3,6-2 |
| ITF W15 LPD Gran Canaria | 2020/11/27 10:10 | Oksana Selekhmeteva v Gerlach, Katharina | 6-4,0-6,3-6 |
| ITF W15 LPD Gran Canaria | 2020/11/26 12:40 | Laura Pigossi v Gerlach, Katharina | 4-6,3-6 |
| ITF W15 LPD Gran Canaria | 2020/11/25 13:15 | Lucia Cortez Llorca v Gerlach, Katharina | 2-6,2-6 |
| ITF W25 Fujairah | 2021/01/17 07:00 | Semenistaja, Marija v Zhuoma Ni Ma | 6-3,3-6,10-7 |
| ITF - W15 Monastir | 2020/10/26 09:30 | Weronika Falkowska v Semenistaja, Marija | 6-2,6-2 |
| ITF - W15 Monastir | 2020/10/25 10:30 | Chahd Berriri v Semenistaja, Marija | 0-6,2-6 |
| ITF - W15 Monastir | 2020/10/20 09:50 | Semenistaja, Marija v Eliessa Vanlangendonck | 1-6,1-6 |
| ITF - W15 Monastir | 2020/10/19 10:00 | Angelina Graovac v Semenistaja, Marija | 2-6,6-4,7-10 |
| ITF - W15 Monastir | 2020/10/13 08:00 | Semenistaja, Marija v Westbury, Katherine | 0-6,1-6 |
| ITF - W15 Monastir | 2020/10/06 10:10 | Semenistaja, Marija v Anna Ureke | 2-6,0-6 |
| ITF - W15 Monastir | 2020/10/04 11:00 | Angelina Graovac v Semenistaja, Marija | 5-7,3-6 |