In the first round of singles at the 2023 Budapest Grand Prix, Tóth rubbed out a contested ball mark with her foot after her opponent, Zhang Shuai, had remonstrated with the umpire over the line call.

The mark appeared to show that Zhang’s shot had landed in, and she argued with the umpire for six minutes over the decision to award the point to Tóth.

[4] Tóth's actions of erasing the ball mark, allegedly mocking Zhang’s outburst, and celebrating at her retirement sparked backlash among the tennis community.

Current players described them as "disgusting" (Ajla Tomljanović), "[I give] zero respect to her" (Daria Saville), "a quick way to lose respect from your peers" (Ellen Perez), "one of the worst line calls and poorly handled situations" (Jamie Loeb), "very bad sportsmanship" (Daria Kasatkina), "not acceptable" (Ons Jabeur), "another level of unsportsmanlike conduct" (Victoria Azarenka), and that Tóth "should be banned from the tour" (Maria Sakkari).

[6] Tóth subsequently lost her next match to Kateryna Baindl,[7] and after several days gave a public apology for her actions.