In April 2016, Malečková made her WTA Tour main-draw debut at the 2016 Katowice Open where she received entry as a lucky loser.

In qualifying, she had defeated Mandy Minella and Renata Voráčová, falling short in the final round to Isabella Shinikova.

In September 2022, she reached her first WTA Challenger final at the Budapest Open, alongside compatriot Renata Voráčová.

[4] During the grass-court season, she reached another doubles final at the $100k Ilkley Trophy, again with Chwalińska, but they finished runners-up.

[5] Only main-draw results in WTA Tour, Grand Slam tournaments, Fed Cup/Billie Jean King Cup and Olympic Games are included in win–loss records.