Tamara Zidanšek (Slovene: [zíːdanˈʃɛːk]; born 26 December 1997) is a Slovenian professional tennis player. She has career-high rankings of world No. 22 in singles and No. 47 in doubles. She has won one singles title and four doubles titles on the WTA Tour along with three singles titles and one doubles title on the WTA Challenger Tour. Additionally, she has won 18 titles in singles and six in doubles on the ITF Circuit. She is currently the No. 2 player from Slovenia.
In Juniors, she reached a career-high ranking of No. 16 in December 2015.
Playing for the Slovenia Fed Cup team, she has a win–loss record of 12–13 (as of July 2025).
2014-2019: Professional debut, WTA Tour semifinals
Zidanšek made a perfect professional debut in 2014 at her home in Velenje, passing three qualifying rounds to go in the main draw and claim her first title on the pro-level at the age of 16.
In 2019, Zidanšek reached her second WTA Tour quarterfinal and then second semifinal (after reaching her first semifinal at the 2018 Moscow River Cup) in Hua Hin, Thailand, defeating Jennifer Brady and Viktorija Golubic.
2021: Major semifinal, top 50, top-10 win, WTA Tour title
Ranked No. 85, Zidanšek reached the semifinals of a Grand Slam championship for the first time at the 2021 French Open, defeating Sorana Cîrstea in straight sets and Paula Badosa in three sets. These wins made her the first Slovenian female player to accomplish this since the country became independent in 1991. As a result, Zidanšek entered the top 50 at world No. 47 in the WTA single rankings for the first time on 14 June 2021. She also scored her first top-ten win in the first round, against the No. 6 seed, Bianca Andreescu. In her semifinal match, Zidanšek was defeated by Anastasia Pavlyuchenkova in straight sets.
At the Ladies Open Lausanne, as the top seed, Zidanšek beat Marina Melnikova, Mandy Minella, Lucia Bronzetti, Maryna Zanevska and Clara Burel to win her first WTA Tour singles title.
2022: Top 25, two major third rounds
Seeded 29th at the Australian Open, she reached the third round for the first time, but lost to Alizé Cornet. At the French Open, Zidanšek also reached the third round in which she lost to Jessica Pegula, in straight sets.
2023-2024: Third WTA 125 title
After saving four championship points and defeating Rebecca Šramková in the final, Zidanšek won the WTA 125 tournament in Bari. As a result, she moved 30 positions up in the rankings back to the top 100 on 11 September 2023.
She qualified for the 2024 French Open defeating Hailey Baptiste in the final qualifying round. In the main draw, she defeated Alison Van Uytvanck, to set up a match against world No. 3, Coco Gauff, which she lost in straight sets.
Ranked No. 261 at the Thailand Open, Zidanšek reached her first WTA Tour semifinal since January 2022 coming back from a set down to beat Tatiana Prozorova, sixth seed Katie Volynets, and Nadia Podoroska, saving four match points in the quarterfinals. She lost in the last four to eventual champion, Rebecca Šramková.
Zidanšek qualified for the main draw of the Australian Open, before losing to Anastasia Potapova in the first round.
Zidanšek was coached by Zoran Krajnc until April 2021. In May 2021, her team signed with Pancho Alvariño from Spain.
Carl Maes joined the team in December 2021 for a period of one year. After a few coaching trials, she was coached by former Slovenian ATP Tour player Blaž Kavčič until June 2024.