Stadium: Court 5 Round: 62 Ground: Clay
| ITF W25 Jablonec nad Nisou | 2021/09/13 08:00 | Klara Ondrejcekova v Zeynep Sonmez | 0-6,1-6 |
| ITF Women Varna | 2021/09/05 13:00 | Klara Ondrejcekova v Ana Mukic | 2-6,4-6 |
| ITF W15 Bad Waltersdorf | 2021/08/23 07:00 | Giulia Carbonaro v Klara Ondrejcekova | 6-7,6-1,10-5 |
| ITF W15 Antalya | 2021/06/08 07:00 | Ivania Martinich v Klara Ondrejcekova | 6-0,6-0 |
| ITF W15 Antalya | 2021/06/07 07:00 | Daria Zelinskaya v Klara Ondrejcekova | 6-4,3-6,3-10 |
| ITF W15 Antalya | 2021/06/01 07:00 | Klara Ondrejcekova v Lexington Reed | 5-7,3-6 |
| ITF W15 Antalya | 2021/04/18 07:00 | Evgeniya Burdina v Klara Ondrejcekova | 5-7,6-4,7-10 |
| ITF W15 Antalya | 2021/04/12 09:00 | Ekaterina Shalimova v Klara Ondrejcekova | 6-2,6-1 |
| ITF W15 Chornomorsk | 2021/08/23 07:15 | Vasilisa Belonog v Aliesia Reva | 3-6,6-7 |