Round: 1
| Polish National Tour Women | 2020/07/17 09:30 | Piter, Katarzyna v Zawadzka, Joanna | 3-6,6-4,7-5 |
| Polish National Tour Women | 2020/07/28 09:00 | Piter, Katarzyna v Shoshyna, Anastasiya | 0-6,6-4,3-6 |
| Polish National Tour Women | 2020/07/27 09:30 | Piter, Katarzyna v Stefania Rogozinska-Dzik | 6-2,6-3 |
| Polish National Tour Women | 2020/07/26 14:05 | Piter, Katarzyna v Marcelina Podlinska | 7-5,6-2 |
| Polish National Tour Women | 2020/07/25 15:45 | Piter, Katarzyna v Rutkowska, Witoria | 6-2,6-2 |
| Polish National Tour Women | 2020/07/18 08:00 | Katarzyna Kawa v Piter, Katarzyna | 7-6,6-0 |
| Polish National Tour Women | 2020/07/17 09:30 | Piter, Katarzyna v Zawadzka, Joanna | 3-6,6-4,7-5 |
| Polish National Tour Women | 2020/07/15 14:35 | Piter, Katarzyna v Wierzbowska, Aleksandra | 6-2,6-0 |
| Eastern European Championship Women | 2020/07/10 12:50 | Piter, Katarzyna v Mihaela Djakovic | 6-2,5-7,6-2 |
| Polish National Tour Women | 2020/07/29 11:00 | Krygier, Zuzanna v Zawadzka, Joanna | 1-6,0-6 |
| Polish National Tour Women | 2020/07/25 12:35 | Marcelina Podlinska v Zawadzka, Joanna | 0-6,6-2,6-3 |
| Polish National Tour Women | 2020/07/24 16:45 | Wysoczanska, Katarzyna v Zawadzka, Joanna | 5-7,1-6 |
| Polish National Tour Women | 2020/07/17 09:30 | Piter, Katarzyna v Zawadzka, Joanna | 3-6,6-4,7-5 |
| Polish National Tour Women | 2020/06/23 10:00 | Zawadzka, Joanna v Shoshyna, Anastasiya | 1-6,6-2,3-6 |
| Polish National Tour Women | 2020/06/22 12:20 | Zawadzka, Joanna v Kania, Paula | 6-3,6-3 |
| ITF - W15 Monastir | 2020/03/05 08:30 | Nefisa Berberovic v Zawadzka, Joanna | 6-1,6-1 |
| ITF - W15 Monastir | 2020/03/03 08:30 | Sina Herrmann v Zawadzka, Joanna | 3-6,5-7 |