Stadium: Court 1 Round: 64 Ground: Hardcourt outdoor
| 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 |
| Polish National Tour Women | 2020/08/18 09:00 | Piter, Katarzyna v Martyna Kubka | 4-6,3-6 |
| Polish National Tour Women | 2020/08/16 08:30 | Piter, Katarzyna v Kania, Paula | 6-4,6-3 |
| Polish National Tour Women | 2020/08/15 12:50 | Piter, Katarzyna v Alicja Formella | 6-1,6-0 |
| ITF W25 Porto | 2020/09/27 10:00 | Jessica Pieri v Ueda, Ramu | 5-7,2-6 |
| WTA - Rome | 2020/09/12 09:35 | Jessica Pieri v Bolsova Zadoinov, Aliona | 1-6,1-6 |
| WTA Prague | 2020/09/02 08:00 | Leonie Kung v Jessica Pieri | 6-1,1-6,4-6 |
| WTA Prague | 2020/08/31 08:00 | Jessica Pieri v Lopatetska, Daria | 3-6,7-6,6-4 |
| WTA Prague | 2020/08/29 12:00 | Irene Burillo Escorihuela v Jessica Pieri | 4-6,5-7 |
| Italian Umbrian Open Women | 2020/06/25 08:30 | Nicole Fossa Huergo v Jessica Pieri | 7-6,6-4 |
| Grenoble, Singles Qualifying W-ITF-FRA-04A | 2020/02/13 11:15 | Jessica Pieri v Amandine Hesse | 6-7,6-7 |
| ITF W25 Trnava | 2020/02/05 10:10 | Jessica Pieri v Viktoria Morvayova | 2-6,5-7 |