On the ITF Junior Circuit, she had a career-high combined ranking of 31, achieved on 22 January 2018.

[3] On New Year’s Eve 2022, she made her debut in mixed doubles match alongside Adrian Andreev which they lost to the top-seeded team of Maria Sakkari and Stefanos Tsitsipas.

The following day, she made her WTA Tour debut and lost her maiden singles match to Elise Mertens in three sets.

[7] She made her main-draw debut at the 2024 Budapest Grand Prix as a qualifier, losing in the first round to fourth seed Sara Sorribes Tormo in three sets.

[8] Gergana Topalova debuted in Bulgaria Fed Cup team in 2019; since then she has accumulated a 3–4 singles and a 4–3 doubles (7–7 overall) win–loss record.