Stadium: Court 2 Round: 19 Ground: Grass
| WTA - Bogota | 2021/04/03 16:25 | Piter, Katarzyna v Marina Melnikova | 5-7,0-6 |
| WTA Guadalajara | 2021/03/06 23:20 | Govortsova, Olga v Piter, Katarzyna | 6-0,6-2 |
| WTA - Abu Dhabi | 2021/01/05 08:05 | Piter, Katarzyna v Jessica Pieri | 4-6,0-6 |
| ITF W80 Tyler | 2020/10/26 19:20 | Hibi, Mayo v Piter, Katarzyna | 6-4,6-7,10-5 |
| ITF W60 Saint Malo | 2020/09/08 09:45 | Piter, Katarzyna v Flavie Brugnone | 0-6,3-6 |
| Polish National Tour Women | 2020/08/24 09:30 | Piter, Katarzyna v Weronika Falkowska | 4-6,6-3,3-6 |
| Polish National Tour Women | 2020/08/23 17:20 | Piter, Katarzyna v Oczachowska, Julia | 6-0,6-0 |
| Polish National Tour Women | 2020/08/23 09:30 | Piter, Katarzyna v Alicja Formella | 6-2,6-1 |
| ITF W25 Denain | 2021/06/16 09:15 | Nastasja Schunk v Paula Ormaechea | 2-6,6-3,6-7 |
| ITF W25 Denain | 2021/06/15 10:05 | Nastasja Schunk v Sinja Kraus | 6-2,6-2 |
| ITF W25 Denain | 2021/06/14 10:10 | Sarah Rebecca Sekulic v Nastasja Schunk | 1-6,2-6 |
| ITF W25 Otocec | 2021/05/31 09:05 | Beatriz Haddad Maia v Nastasja Schunk | 6-4,6-4 |
| ITF W25 Otocec | 2021/05/30 08:00 | Mila Masic v Nastasja Schunk | 1-6,0-6 |
| WTA - Stuttgart | 2021/04/19 15:00 | Bencic, Belinda v Nastasja Schunk | 6-4,6-2 |
| WTA - Stuttgart | 2021/04/18 11:10 | Noma Noha Akugue v Nastasja Schunk | 0-6,4-6 |
| WTA - Stuttgart | 2021/04/17 12:25 | Nastasja Schunk v Daniela Seguel | 6-4,6-4 |