Stadium: ourt 7C Round: 62 Ground: Clay
| ITF W60 Prague | 2021/08/29 09:30 | Sina Herrmann v Lavickova, Kristyna | 4-6,6-2,10-5 |
| ITF W25 Radom | 2021/08/09 10:10 | Sina Herrmann v Jelen, Aleksandra Julia | 1-6,4-6 |
| ITF W25 Bydgoszcz | 2021/08/04 08:00 | Sina Herrmann v Carole Monnet | 6-7,6-7 |
| ITF W25 Bydgoszcz | 2021/08/03 08:00 | Sina Herrmann v Olyanovskaya, Valeriya | 4-6,6-4,10-3 |
| ITF W25 Bydgoszcz | 2021/08/02 08:00 | Sina Herrmann v Christina Rosca | 6-1,6-2 |
| ITF W60 Grodzisk Mazowiecki | 2021/07/26 10:40 | Dagan Fruchtman, Mika v Sina Herrmann | 1-6,6-4,10-8 |
| ITF W60 Grodzisk Mazowiecki | 2021/07/25 12:00 | Sowjanya Bavisetti v Sina Herrmann | 1-6,1-6 |
| ITF W25 Tarvisio | 2021/07/13 11:50 | Sina Herrmann v Cristina Dinu | 2-6,0-6 |
| ITF W60 Prague | 2021/08/29 11:00 | Nelly Knezkova v Sizikova, Yana | 1-6,0-6 |
| WTA - Saint-Malo | 2021/05/02 12:15 | Sizikova, Yana v Tessah Andrianjafitrimo | 6-4,0-6,5-7 |
| WTA - Bogota | 2021/04/03 18:20 | Sizikova, Yana v Harmony Tan | 1-6,6-4,4-6 |
| WTA - Abu Dhabi | 2021/01/05 07:35 | Anna Bondar v Sizikova, Yana | 6-0,6-1 |
| ITF W25 Kazan | 2020/01/21 07:00 | Sizikova, Yana v Manilova, Maria | 6-4,2-6,5-10 |
| ITF W25 Kazan | 2020/01/20 11:25 | Sizikova, Yana v Mikhaylova, Maria | 6-1,6-4 |
| Taipei, Taipei Chinois | 2019/11/11 04:35 | Emily Webley-Smith v Sizikova, Yana | 6-2,6-2 |
| Taipei, Taipei Chinois | 2019/11/10 04:20 | Riley, Alexandra v Sizikova, Yana | 4-6,2-6 |