Olga Danilović (Serbian Cyrillic: Олга Даниловић, pronounced [ôːlɡa danǐːlovitɕ]; born 23 January 2001) is a Serbian professional tennis player. She has a career-high singles ranking of world No. 32 by the WTA, achieved on 14 July 2025, and a best doubles ranking of No. 82, reached on 2 February 2026. Danilović has won two singles titles and two doubles titles on the WTA Tour.
On the WTA Challenger Tour, she has won two singles titles and one doubles title. Additionally, she has won seven singles titles and one doubles title on the ITF Circuit. Playing for Serbia, Danilović holds a win–loss record of 12–8 in Billie Jean King Cup competition, as of June 2025.
Danilović's father is Serbian former basketball player Predrag Danilović, while her mother, Svetlana (née Radošević), is a sports reporter for Radio Television of Serbia. Her parents met at a basketball game in their teens. She has a younger sister, Sonja, and a younger brother, Vuk.
As a junior, Danilović posted a win–loss record of 97–33 in singles and 72–24 in doubles, and reached a No. 5 in the combined ITF junior world rankings in January 2018.
She won three major doubles titles (each on a different surface) with three different partners – the 2016 French Open with Paula Arias Manjón, 2017 Wimbledon with Kaja Juvan and 2017 US Open with Marta Kostyuk.
2018: Top 100, first WTA Tour titles; Fed Cup Heart Award
Danilović made her Fed Cup debut in February 2018 in Group I of Fed Cup Europe/Africa Zone, winning all three singles matches, including a two set win over world No. 15, Anastasija Sevastova, in the promotional play-offs. The courageous performances for the national team earned Danilović a Fed Cup Heart Award and a cheque of $1,000 to be donated to a charity, which she chose to donate to University Children's Hospital in Belgrade.
In March, she won her first 25k title in Santa Margherita di Pula. In May, she was given a wildcard for the qualifying into the Premier Mandatory tournament in Madrid, where she beat former top-30 player Kateryna Bondarenko but lost to Aryna Sabalenka in the final round of qualifying. In mid-July, Danilović won the first 60k title in her career when she came back from one set down to beat another former top 30 player, Laura Siegemund, in the final of Versmold. She also reached the final in doubles of the same tournament with compatriot Nina Stojanović.
In late July, she won her first career WTA Tour singles title in Moscow, defeating Anastasia Potapova in the final, in three sets. Danilović became the first player born in the third millennium (after 2000) to win a WTA Tour singles title. She also became the second lucky loser in the history of the WTA Tour to win the title. This was the first WTA tournament final between two players under 18 since Tatiana Golovin and Nicole Vaidišová played in the final of the 2005 Japan Open.
She participated in the US Open qualifying, where she beat Bianca Andreescu, before losing to Jaimee Fourlis. She then entered the Tashkent Open, where she beat Anna Kalinskaya in the first round, before losing to Anastasia Potapova in a Moscow re-match. In the same tournament, she won the doubles title, partnering Tamara Zidanšek.
On 1 October 2018, Danilović entered the top 100 for the first time when she reached a singles ranking of 97. The following week, she reached her highest ranking of the season, world No. 96.
In mid-October, she lost in the first round of qualifying in Linz and Luxembourg. She next participated in the WTA 125 Mumbai Open, where she was seeded fourth and lost to Danka Kovinić in the first round, whom she also partnered with to reach the semifinals in doubles. This proved to be her last tournament of the year as she withdrew from the following week's WTA 125 Open de Limoges.
2021: Australian Open and US Open debuts
Along with Francesca Jones, Danilović made her major main-draw debut at the Australian Open. She defeated 16th seed Petra Martić in the first round, before losing her next match to Shelby Rogers.
In July, she made two back-to-back quarterfinals. First, at the Budapest Grand Prix, she won first two rounds, before losing to Dalma Gálfi in the quarterfinal. The following week, at the Palermo Ladies Open, she lost to Zhang Shuai in the same round.
Danilović qualified for the US Open and defeated Alycia Parks in the first round. She withdrew just before her second round match against defending champion and third seed Naomi Osaka due to medical reasons.
At the French Open, Danilović reached the main draw to make her debut at this major defeating Viktoriya Tomova in the final qualifying round. She defeated Dalma Gálfi in the first round, before losing to 23rd seed Jil Teichmann.
Ranked No. 124 as a qualifier at the Ladies Open Lausanne, she reached her second career final by beating Misaki Doi in the first round, Anna Kalinskaya in the second, home favorite Simona Waltert in the quarterfinals, and Anastasia Potapova in the semifinals. In the final, she was beaten by Petra Martić. At the same tournament, she won the doubles event, partnering with Kristina Mladenovic.