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, 5–7, 6–1, 6–3, in the final of Versmold.

[citation needed] In late July, she won her first career WTA Tour singles title in Moscow, defeating Anastasia Potapova in the final, in three sets.

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.

[citation needed] On 1 October 2018, Danilović entered the top 100 for the first time when she reached a singles ranking of 97.

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.

[citation needed] Along with Francesca Jones, Danilović made her Grand Slam main-draw debut at the Australian Open.

[16] She withdrew just before her second round match against defending champion and third seed Naomi Osaka due to medical reasons.

[17] At the French Open, Danilović reached the main draw to make her debut at this major defeating Viktoriya Tomova in the final qualifying round.

124 as a qualifier at the Ladies Open Lausanne, she reached her second career final by beating Misaki Doi in the first round,[21] Anna Kalinskaya in the second,[22] home favorite Simona Waltert in the quarterfinals,[23] and Anastasia Potapova in the semifinals.

[27] Playing with Elisabetta Cocciaretto, Danilović won the doubles title at the WTA 125 Open Delle Puglie in September, defeating Andrea Gámiz and Eva Vedder in the final.

[28] In May, Danilović won her first $100k title at the Open Villa de Madrid, beating Sara Sorribes Tormo in the final.

[29] At the French Open, as a qualifier, Danilović reached the third round, her best Grand Slam performance up to date, with wins over Jasmine Paolini[30] and Kateryna Baindl.

[34] At the French Open, Danilović qualified for the main draw and defeated Martina Trevisan,[35] 11th seed Danielle Collins,[36][37] and Donna Vekić to reach the fourth round at a Grand Slam for the first time.

[38][39] She became the first Serbian woman to reach the second week since Jelena Janković at Wimbledon 2015, and the first at Roland Garros since Ana Ivanovic in the same year.

[52] Danilovic won the final against qualifier Caroline Dolehide in straight sets to claim her second WTA Tour title, six years after winning her first.

[68] Only main-draw results in WTA Tour, Grand Slam tournaments, Fed Cup/Billie Jean King Cup and Olympic Games are included in win–loss records.