| UTR Pro Tennis Series Ricany Women | 2021/09/21 09:00 | Krtenova, Sonja v Polanska, Tereza | 6-4,7-6 |
| UTR Pro Tennis Series Ricany Women | 2021/09/20 09:00 | Barbora Michalkova v Krtenova, Sonja | 6-2,5-3 |
| UTR Pro Tennis Series Ricany Women | 2021/09/19 08:30 | Krtenova, Sonja v Kristina Zamecnikova | 3-6,4-5 |
| ITF W25 Jablonec nad Nisou | 2021/09/13 09:00 | Detiuc, Anastasia v Krtenova, Sonja | 2-6,6-3,10-6 |
| ITF W25 Frydek Mistek | 2021/09/05 08:00 | Veronika Erjavec v Krtenova, Sonja | 6-4,6-1 |
| ITF W60 Prague | 2021/08/29 09:30 | Lena Papadakis v Krtenova, Sonja | 6-0,6-1 |
| ITF W60 Prerov | 2021/08/22 09:00 | Maileen Nuudi v Krtenova, Sonja | 3-6,6-3,10-4 |
| UTR Pro Tennis Series Ricany Women | 2021/07/03 15:30 | Denisa Pospisilova v Krtenova, Sonja | 6-3,5-2 |
| UTR Pro Tennis Series Ricany Women | 2021/09/21 09:00 | Barbora Michalkova v Denisa Hanakova | 6-2,5-0 |
| UTR Pro Tennis Series Ricany Women | 2021/09/20 09:22 | Polanska, Tereza v Denisa Hanakova | 2-6,6-3,6-1 |