Teodora Kostović (; born 28 June 2007) is a Serbian professional tennis player. She reached her best WTA singles ranking of world No. 146 on 27 July 2026.
Early life and background Kostović comes from a sports-focused family and has a brother named Miloš. She began playing tennis at age five and reportedly expressed an early ambition to become the world No. 1 ranked player.
Career Junior events Competing on the ITF Junior Circuit, Kostović achieved a career-high ranking of world No. 6.
She won J300 singles titles on clay courts in Plovdiv and Vrsar in 2023.
In 2024, she claimed five J300 titles across all three major surfaces. Her victories included wins on grass in Roehampton, on hard courts in College Park, and on clay in Bradenton, Oberpullendorf, and Bytom. That same year, she was also a finalist at the J500 event on clay in Offenbach, and the J300 event on hard courts in Indian Wells.
In September 2024, she won the U18 European Junior Championships, defeating Alena Kovačková in the final.
Junior Grand Slam performance
Singles: Australian Open: 2R (2024, 2025) French Open: 3R (2023, 2024) Wimbledon: QF (2024, 2025) US Open: QF (2024)
Doubles: Australian Open: QF (2024) French Open: 2R (2024, 2025) Wimbledon: 2R (2025) US Open: QF (2024)
2024: Senior debut Aged 16, Kostović made her professional debut on the ITF Women's World Tennis Tour in Kuršumlijska Banja, Serbia. In May 2024, she reached the singles semifinals of a W15 event there, losing in three sets to compatriot Anja Stanković. Later in 2024, she played four additional tournaments in the same town at the W15 and W75 levels, not advancing past the quarterfinals in any of them.
2025: WTA debut Kostović made her WTA Tour singles debut in February at the WTA 500 Abu Dhabi Open, entering the qualifying draw via a wildcard earned through a junior tournament result. In the first qualifying round, she won the first set 6–2 against Diane Parry before the French player retired from the match. In the final qualifying round, Kostović initially led 4–1 against McCartney Kessler but ultimately lost 4–6, 2–6. The following month, she received a wildcard into the qualifying rounds of the WTA 1000 Miami Open. Ranked No. 756 at the time, Kostović defeated world No. 99 and 17th qualifying seed Olivia Gadecki in the first round. She lost to Greet Minnen in the final qualifying round.
In April, Kostović received a wildcard for the qualifying rounds and subsequently qualified for the main draw of the WTA 1000 in Madrid. She achieved this by defeating top-100 player Elena-Gabriela Ruse in the first qualifying round and then Lucrezia Stefanini in the final qualifying round. Entering the main draw of Madrid, Kostović, ranked No. 625, was the lowest-ranked participant aside from those using a protected ranking. She was also the youngest player in the main draw. In the first round, she lost to Eva Lys in straight sets.
2026: Major debut, First WTA quarterfinal At the 2026 SP Open Kostović reached her first WTA Tour quarterfinal defeating ninth seed Darja Semeņistaja.
Billie Jean King Cup Kostović received her first nomination to represent Serbia in the Billie Jean King Cup in April 2025, under the captaincy of Dušan Vemić, for the 2025 Billie Jean King Cup Europe/Africa Zone Group I event against Slovenia and Lithuania, and later in the promotional play-off tie against Croatia. She made her debut for the national team on 10 April 2025, recording a victory over Klaudija Bubelytė of Lithuania.
Performance timelines
Only main-draw results in WTA Tour, Grand Slam tournaments, Billie Jean King Cup, United Cup, Hopman Cup and Olympic Games are included in win–loss records.
Singles Current through the 2025 Miami Open.
Tournament 20252026 SR W–L Win%Grand Slam tournamentsAustralian Open AQ2 0 / 0 0–0 French Open AQ20 / 00–0WimbledonA1R0 / 10–1US Open AQ10 / 0 0–0 Win–loss 0–0 0–1 0 / 1 0–1 WTA 1000 tournaments Miami Open Q2 0 / 0 0–0 Madrid Open 1R 0 / 1 0–1 Win–loss 0–1 0 / 1 0–1
WTA 125 finals Singles: 1 (runner-up) ResultW–LDateTournamentSurfaceOpponentScoreLoss0–1Ankara Open, TurkeyHard Berfu Cengiz6–2, 4–6, 5–7
ITF Circuit finals Singles: 3 (2 titles, 1 runner-up) LegendW100 tournaments (1–0)W75 tournaments (1–1)Finals by surfaceClay (2–1)
ResultW–LDateTournamentTierSurfaceOpponentScoreLoss 0–1 May 2025ITF Kuršumlijska Banja, SerbiaW75 Clay Alina Charaeva 4–6, 6–7(5)Win 1–1 Aug 2025Serbian Tennis Tour, SerbiaW75 Clay Lina Gjorcheska 7–5, 6–3Win 2–1 Jul 2026Ladies Open Amstetten, AustriaW100 Clay Vivian Wolff 6–4, 6–0
References
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