Teodora Kostović
Teodora Kostović is a Serbian professional tennis player. On 18 August 2025, she reached her best singles ranking of world No. 265 on the WTA.
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.
Grand Slam performance
Singles:
- Australian Open: 2R
- French Open: 3R
- Wimbledon: QF
- US Open: QF
- Australian Open: QF
- French Open: 2R
- Wimbledon: 2R
- US Open: QF
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 [2025 Mutua 2025 Mutua Madrid Open – Women's singles|Madrid Open – Women's singles|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: 2 (1 title, 1 runner-up)
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Loss | 0–1 | May 2025 | ITF Kuršumlijska Banja, Serbia | W75 | Clay | Alina Charaeva | 4–6, 6–7 |
| Win | 1–1 | Aug 2025 | Serbian Tennis Tour, Serbia | W75 | Clay |  |