Stadium: Court 6 Round: 62 Ground: Hardcourt outdoor
| ITF W25 Manacor | 2022/01/16 09:00 | Carreras, Amanda v Sizikova, Yana | 6-2,2-6,10-12 |
| WTA Nur-Sultan | 2021/09/25 11:30 | Lucia Bronzetti v Sizikova, Yana | 6-2,6-4 |
| ITF W60 Prague | 2021/08/31 08:00 | Sizikova, Yana v Alexandra Bozovic | 6-1,2-6,12-14 |
| ITF W60 Prague | 2021/08/30 08:00 | Sina Herrmann v Sizikova, Yana | 1-6,1-6 |
| 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 - W15 Antalya | 2021/12/08 10:30 | Panackova, Marketa v Ondrejcekova, Klara | 3-6,6-2,11-9 |
| ITF - W15 Antalya | 2021/12/05 07:00 | Cherkassova, Tamara v Ondrejcekova, Klara | 0-6,1-6 |
| ITF - W15 Antalya | 2021/11/30 06:00 | Arina Gabriela Vasilescu v Ondrejcekova, Klara | 7-5,6-3 |
| ITF - W15 Antalya | 2021/11/29 06:00 | Andreea Alexandra Lila v Ondrejcekova, Klara | 6-7,6-2,7-10 |
| ITF - W15 Antalya | 2021/11/23 08:05 | Sylvie Zund v Ondrejcekova, Klara | 6-3,6-1 |
| ITF - W15 Antalya | 2021/11/22 09:00 | Abed, Yara v Ondrejcekova, Klara | 2-6,3-6 |
| ITF - W15 Antalya | 2021/11/15 06:30 | Victoria Gomez v Ondrejcekova, Klara | 1-6,6-4,10-3 |
| ITF - W15 Antalya | 2021/11/08 07:00 | Ondrejcekova, Klara v Belonog, Vasilisa | 6-3,3-6,3-10 |