| ITTF Challenge, Polish Open 2019, WS, Group Stage | 2020/03/11 17:40 | Mynarova, Karolina v Slazak, Julia | W | 0-3 |
| Oman Open U21 Women | 2020/03/06 10:00 | Vishniakova, Olga v Slazak, Julia | L | 4-2 |
| Oman Open U21 Women | 2020/03/05 12:50 | Adina Diaconu v Slazak, Julia | L | 4-1 |
| Poland Ekstaklasa Women | 2020/02/02 13:55 | Slazak, Julia v Zakrzewska, Agata | W | 3-1 |
| Poland Ekstaklasa Women | 2020/01/10 18:17 | Miklaszewska, Maja v Slazak, Julia | W | 1-3 |
| Poland Ekstaklasa Women | 2020/01/05 16:22 | Dominika Wolowiec v Slazak, Julia | L | 3-1 |
| Poland Ekstaklasa Women | 2019/11/15 16:15 | Slazak, Julia v Sandra Wabik | W | 3-0 |
| Poland Ekstaklasa Women | 2019/10/23 15:37 | Slazak, Julia v Aleksandra Michalak | L | 2-3 |
| Oman Open U21 Women | 2020/03/11 11:00 | Gauthier, Lucie v Sakura Yokoi | W | 1-3 |
| Oman Open U21 Women | 2020/03/11 09:40 | Szymczak, Julia v Sakura Yokoi | W | 2-3 |