Teodora Kostović

Teodora Kostović (; born 28 June 2007) She began playing tennis at age five and reportedly expressed an early ambition to become the world No. 1 ranked player.

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.

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 1000 debut Kostović made her WTA Tour singles debut in February 2025 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, in March 2025, 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 2025, 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.

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 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.

ITF Circuit finals Singles: 3 (2 titles, 1 runner-up) LegendW100 tournaments (1–0)W75 tournaments (1–1)Finals by surfaceClay (2–1)