| UTR Pro Tennis Series Ricany - nők | 2021/09/19 08:30 | Sonja Krtenova v Kristina Zamecnikova | 3-6,4-5 |
| ITF W25 Jablonec nad Nisou | 2021/09/13 09:00 | Anastasia Detiuc v Sonja Krtenova | 2-6,6-3,10-6 |
| ITF W25 Frydek Mistek | 2021/09/05 08:00 | Veronika Erjavec v Sonja Krtenova | 6-4,6-1 |
| ITF W60 Prague | 2021/08/29 09:30 | Lena Papadakis v Sonja Krtenova | 6-0,6-1 |
| ITF W60 Prerov | 2021/08/22 09:00 | Maileen Nuudi v Sonja Krtenova | 3-6,6-3,10-4 |
| UTR Pro Tennis Series Ricany - nők | 2021/07/03 15:30 | Denisa Pospisilova v Sonja Krtenova | 6-3,5-2 |
| UTR Pro Tennis Series Ricany - nők | 2021/07/03 07:00 | Luisa Meyer Auf Der Heide v Sonja Krtenova | 6-0,6-3 |
| UTR Pro Tennis Series Ricany - nők | 2021/07/01 08:00 | Jana Kareisova v Sonja Krtenova | 5-7,4-6 |